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    Tytuł:
    Lipid production and heavy metals adsorption by an Aspergillus fumigatus GAH1 isolate
    Autorzy:
    Haddad, A.M.
    El-Shall, H.S.
    Abu-Elreesh, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2096970.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    lipids
    biodiesel
    fungi
    Aspergillus
    bioremediation
    heavy metals
    Opis:
    Few species of filamentous fungi can accumulate considerable amounts of intracellular lipids when grown under certain stress conditions; thus, they can be used for biodiesel production. Moreover, their residual biomass can be used for the removal of heavy metals from contaminated water. An oleaginous Aspergillus fumigatus GAH1 isolate was isolated from a soil sample in Borg El-Arab industrial area, Alexandria, Egypt, and was characterized in batch cultures. The influence of different carbon and nitrogen sources and the initial pH of the medium on the fungal biomass and lipid production was investigated. Under optimized conditions, the A. fumigatus GAH1 isolate could accumulate up to 22.4% of its dry biomass as lipids. Oleic and palmitic acids were the dominant fatty acid fractions produced. After lipid extraction, to further improve the process economy, the fungal biomass was applied as a biosorbent to remove heavy metals such as Cr, Cd, and Zn from contaminated wastewater. The biosorption efficiency and capacity of the raw, H2O-washed, and NaOH-treated fungal biomass were examined. The biosorption capacity of 33.37, 29.29, and 27.75 mg/g was recorded for Cr, Cd, and Zn, respectively. Moreover, the biosorption efficiency was more than 69% for the tested heavy metals. In conclusion, A. fumigatus GAH1 may be considered as a promising biodiesel producer, and its biomass waste can be further used for the biosorption of heavy metals from contaminated wastewater.
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2020, 101, 1; 15-24
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorpcja metali ciężkich na tlenku glinu i stabilizacja zużytego adsorbentu przy pomocy technologii SULSTAR
    Heavy metals adsorption on aluminium oxide and stabilization of spent adsorbent using a SULSTAR technology
    Autorzy:
    Rajczykowski, K.
    Loska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/357174.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Śląska
    Tematy:
    heavy metal adsorption
    dangerous wastes stabilization
    SULSTAR stabilization
    adsorpcja metali ciężkich
    stabilizacja odpadów niebezpiecznych
    stabilizacja SULSTAR
    Opis:
    The study aimed to analyze the adsorptive properties of aluminium oxide and effectiveness of stabilization process of spent adsorbent using an innovative technology based on the sulfur polymer called "SULSTAR", developed and patented by company Marbet-Wil in Gliwice. The process of adsorption of the heavy metals was carried out at pH 5 in glass batch reactors for a period of 2 hours. The average amount of lead, adsorbed in the process was 3.30 mg of lead per gram of adsorbent. After adsorption spent aluminium oxide was dried and then used to a stabilization process at a mass ratio 1: 2 (adsorbent: stabilizer). As a result of deterioration process of analysed stabilized adsorbents, the process of stabilization reduced the amount of lead ions released into deteriorating solution up to 88.7% comparing to unstabilized adsorbent, at the lowest pH level. The release of lead ions to deteriorating solutions at higher pH values, thanks to a stabilization process was completely inhibited.
    Przeprowadzone badania miały na celu analizę właściwości adsorpcyjnych tlenku glinu oraz skuteczności procesów stabilizacji zużytego adsorbentu przy pomocy innowacyjnej technologii siarkowej SULSTAR, opracowanej i opatentowanej przez firmę Marbet-Wil w Gliwicach. Proces adsorpcji metali ciężkich przeprowadzany był przy pH 5, w szklanych reaktorach okresowych przez okres 2 godzin. Średnia ilość zaadsorbowanego w tym procesie ołowiu wynosiła 3,30 mg ołowiu na gram adsorbentu. Po procesie adsorpcji zużyty tlenek glinu suszono a następnie poddawano procesowi stabilizacji w stosunku masowym 1:2 (adsorbent: stabilizator). W wyniku procesu deterioracji zużytych adsorbentów, wykazano, że proces stabilizacji odpadów zredukował ilość uwalnianych do roztworów deteriorujących jonów ołowiu o 88,7% dla roztworu o najniższym pH, a w przypadku roztworów o wyższym pH ponowne uwalnianie ołowiu zostało całkowicie zahamowane.
    Źródło:
    Archiwum Gospodarki Odpadami i Ochrony Środowiska; 2016, 18, 2; 67-72
    1733-4381
    Pojawia się w:
    Archiwum Gospodarki Odpadami i Ochrony Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis of hydrogel nanocomposites and their application in removing dyes and impurities
    Synteza nanokompozytów hydrożelowych i ich zastosowanie do usuwania barwników i zanieczyszczeń
    Autorzy:
    Ebrahimi, Rajabali
    Taherkhani, Mahboubeh
    Powiązania:
    https://bibliotekanauki.pl/articles/24202832.pdf
    Data publikacji:
    2023
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
    Tematy:
    acrylic hydrogel
    nanocomposites
    sonification
    heavy metals adsorption
    dye adsorption
    hydrożele akrylowe
    nanokompozyty
    sonifikacja
    adsorpcja metali ciężkich
    adsorpcja barwników
    Opis:
    Polyacrylate hydrogels containing starch, ZnSe and Fe3O4 nanoparticles were obtained. The polymerization process was carried out in an ultrasonic field. The structure (SEM, FTIR, XRD), swelling properties and the ability of hydrogels to adsorb dyes (methylene blue, methyl orange, methyl red and Eriochrome Black T) and heavy metals (Cu2+) from wastewater were investigated. Hydrogels containing AgCl nanoparticles were also obtained, which, due to their antibacterial properties, can be potentially used in medicine.
    Otrzymano hydrożele poliakrylanowe zawierające nanocząstki skrobi, ZnSe i Fe3O4. Proces polimeryzacji prowadzono w polu ultradźwiękowym. Zbadano strukturę (SEM, FTIR, XRD), właściwości pęczniejące oraz zdolność hydrożeli do adsorpcji barwników (błękit metylenowy, oranż metylowy, czerwień metylowa i czerń eriochromowa T) oraz metali ciężkich (Cu2+) ze ścieków. Otrzymano również hydrożele zawierające nanocząstki AgCl, które ze względu na właściwości antybakteryjne mogą znaleźć potencjale zastosowanie w medycynie.
    Źródło:
    Polimery; 2023, 68, 5; 276--285
    0032-2725
    Pojawia się w:
    Polimery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simultaneous adsorption of heavy metals from water by novel lemon-peel based biomaterial
    Autorzy:
    Šabanović, Elma
    Memić, Mustafa
    Sulejmanović, Jasmina
    Selović, Alisa
    Powiązania:
    https://bibliotekanauki.pl/articles/778437.pdf
    Data publikacji:
    2020
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    lemon peel
    heavy metals
    biosorption
    FAAS
    Opis:
    Simultaneous adsorption of heavy metals in complex multi metal system is insuffnciently explored. This research gives results of key process parameters optimization for simultaneous removal of Cd(II), Co(II), Cr(III), Cu(II), Mn(II), Ni(II) and Pb(II) from aqueous solution (batch system). New lemon peel-based biomaterial was prepared and characterized by infrared spectroscopy with Fourier transformation (FTIR), scanning electron microscopy (SEM), electron dispersive spectroscopy (EDS), while the quantifi cation of metals was made by atomic absorption spectrometry (AAS). Simultaneous removal of seven metals ions was favorable at pH 5 with 300 mg/50 mL solidliquid phase ratio, within 60 min at room temperature with total obtained adsorption capacity of 46.77 mg g–1. Kinetic modeling showed that pseudo-second order kinetic and Weber-Morris diffusion models best describe the adsorption mechanism of all seven heavy metals onto lemon peel.
    Źródło:
    Polish Journal of Chemical Technology; 2020, 22, 1; 46-53
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Review on Adsorption of Heavy Metals from Wood-Industrial Wastewater by Oil Palm Waste
    Autorzy:
    Ayob, Syafiqa
    Othman, Norzila
    Altowayti, Wahid Ali Hamood
    Khalid, Faisal Sheikh
    Bakar, Norshila Abu
    Tahir, Muhammad
    Soedjono, Eddy Setiadi
    Powiązania:
    https://bibliotekanauki.pl/articles/1839174.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    industrial wastewater
    heavy metal
    adsorption
    activated carbon
    oil palm waste
    Opis:
    The use of heavy metals in the manufacturing industry over the past few decades has eventually contributed to a rise in the flow of metallic compounds into wastewater and has raised significant ecological and health threats to living things. Adsorption is an excellent way to treat solid waste effluent, offering significant benefits such as affordability, profitability, ease of operation and efficiency. However, the price of commercial adsorbent namely activated carbon has soared due to its high demand. There is also a green improvement in this method by turning the commercial adsorbent into agricultural waste. In Malaysia, the oil palm waste is such suitable material that can be utilized for making activated carbon, since they are ample and easy to find. Additionally, part of them is agricultural waste that cannot be consumed (i.e. leaves and fronds). Hence, this study aimed to analyse the potential of activated carbon from agricultural waste, namely oil palm waste, in reducing the levels of heavy metals in industrial wastewater.
    Źródło:
    Journal of Ecological Engineering; 2021, 22, 3; 249-265
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of adsorption of heavy metals from water solutions by wood of selected domestic species using X-Ray Fluorescence (XRF)
    Autorzy:
    Balicka, Adrianna
    Szadkowski, Jan
    Powiązania:
    https://bibliotekanauki.pl/articles/2200144.pdf
    Data publikacji:
    2020
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    X-Ray Fluorescence Spectroscopy
    wood shaving
    adsorption
    heavy metals
    Opis:
    Analysis of adsorption of heavy metals from water solutions by wood of selected domestic species using X-Ray Fluorescence (XRF).The aim of this study was to analyze the absorption of three specific heavy metals from model water solution by wood species from domestic Polish forests. This paper focuses on XRF method to determine metal content in samples. European aspen (Populus tremula L.) and Black locust (Robinia pseudoacacia L.) have been chosen. Firstly, shavings were prepared and soaked with standard solutions of lead (II) nitrate, cadmium nitrate and mercury (II) chloride for 7 days. Then, the material was dried and reduced to ashes using muffle furnace. Finally, content of absorbed metal was marked (XRF) and analyzed with a view to initial contents of metal ions in standard solutions. It was established, that the higher the concentration of mercury in standard solution is, the higher impulse counts is obtained for European aspen. This reversal of the dependence is noticeable for second analyzed species.
    Badanie adsorpcji metali ciężkich z modelowych roztworów wodnych przez drewno wybranych gatunków krajowych za pomocą Spektrometrii Fluorescencji Rentgenowskiej (XRF). Celem wykonanych badań było sprawdzenie poziomu adsorpcji wytypowanych metali ciężkich tj. ołowiu, kadmu oraz rtęci, przez dwa gatunki rodzime topolę (Populus tremula L.) oraz robinię akacjową (Robinia pseudoacacia L.). W fazie przygotowawczej materiał został znacznie rozdrobniony i rozdzielony na kilka frakcji. Działanie to miało na celu zwiększenie powierzchni adsorpcji badanego drewna. Azotan kadmu (II), azotan ołowiu oraz chlorek rtęci (II) zostały rozpuszczone w destylowanej wodzie w takich proporcjach, aby stworzyć po cztery roztwory – każdy o innym stężeniu. Wybrana frakcja wiórów została poddana obróbce termicznej w wodzie destylowanej w celu usunięcia zawartego powietrza. Następnie frakcję podzielono na próbki 1 gramowe. Drewno nasiąkało w modelowych roztworach przez ok. 168 godzin. Finalnie zostało ono odsączone, wysuszone i spopielone w piecu muflowym. Tak przygotowane próbki zostały poddane badaniu z wykorzystaniem spektrometrii fluorescencji rentgenowskiej (XRF). Urządzenie analizowało zawartość metali w pyle za pomocą dwóch różnych programów i trzech czasów naświetlania. Otrzymane wartości analizowano pod kątem ilościowym a nie jakościowym.
    Źródło:
    Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology; 2020, 111; 73--82
    1898-5912
    Pojawia się w:
    Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of the process of adsorption of heavy metals in coastal sands containing micro-plastics, with special attention to the effect of aging process and bacterial spread in micro-plastics
    Autorzy:
    Seyfi, Sara
    Katibeh, Homayoun
    Heshami, Monireh
    Powiązania:
    https://bibliotekanauki.pl/articles/2073767.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    adsorption
    aging
    heavy metals
    Erythrobacter
    microplastics
    Opis:
    The chief purpose of this study is to investigate the process of adsorption of heavy metals in sands containing microplastics due to aging and bacterial culture. For this purpose, first, the experiment’s conditions were determined by reviewing previous studies and examining the effects of factors on the duration of bacterial culture and UV radiation. Finally, the test conditions were determined as follows: 25 g of adsorbent in 250 ml solution containing 50 mg/l of lead, cadmium, copper, zinc, chromium, and nickel, 750 micrograms of microplastic, bacterial culture time two days, aging time with UV light 14 days. Results of the study show that the addition of virgin microplastics has little effected on increasing the adsorbent strength, except in the case of nickel which reduces adsorption strength. The aging process increases the absorption of all studied metals by up to 60%. Bacterial culture without an aging process reduces the absorption of nickel and cadmium. Simultaneous use of bacterial culture and aging increases the adsorption power by up to 80% for all metals.
    Źródło:
    Archives of Environmental Protection; 2021, 47, 3; 50--59
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Usuwanie metali ciężkich z roztworów wodnych z wykorzystaniem aerożeli i kserożeli węglowych
    Heavy metal ions removal from aqueous solutions using carbon aerogels and xerogels
    Autorzy:
    Łużny, R.
    Ignasiak, M.
    Walendziewski, J.
    Stolarski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/142876.pdf
    Data publikacji:
    2014
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
    Tematy:
    adsorpcja
    aerożele węglowe
    kserożele węglowe
    metale ciężkie
    adsorption
    carbon aerogels
    carbon xerogels
    heavy metals
    Opis:
    Aerożele i kserożele węglowe otrzymano w procesie polikondensacji rezorcyny z formaldehydem w środowisku wodnym z wykorzystaniem wodorotlenku potasu oraz bromku cetylotrimetylowego jako katalizatorów. Zsyntezowane materiały poddano aktywacji, a następnie zbadano ich skuteczność w procesie adsorpcyjnego usuwania jonów metali ciężkich (niklu, miedzi i cynku) z roztworów wodnych. Otrzymane wyniki wskazują na istotny wpływ warunków syntezy, metody aktywacji oraz rodzaju usuwanego jonu na zdolność sorpcyjną badanych materiałów. Skuteczność usuwania niklu, miedzi i cynku z roztworów wodnych z wykorzystaniem kserożelowych i aerożelowych materiałów węglowych jest zbliżona, a w niektórych przypadkach większa, niż skuteczność komercyjnych węgli aktywnych.
    Carbon aerogels and xerogels were obtained by polycondensation of resorcinol and formaldehyde in the aqueous solution using potassium hydroxide and cetyltrimethylammonium bromide (CTAB) as the catalyst. Synthesised materials were activated and their effectiveness in adsorption of heavy metals ions (nickel, copper and zinc) from aqueous solutions was tested. Obtained results show essential influence of synthesis conditions, activation method and metal ion kind on adsorption capacity of tested materials. Carbon aerogel and xerogels were characterized by similar or better (in some cases) effectiveness of nickel, copper and zinc ions removal than commercial activated carbons.
    Źródło:
    Chemik; 2014, 68, 6; 544-553
    0009-2886
    Pojawia się w:
    Chemik
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal of Heavy Metals from Aqueous Solutions with the Use of Lignins and Biomass
    Autorzy:
    Miros-Kudra, Partycja
    Sobczak, Paulina
    Kopania, Ewa
    Powiązania:
    https://bibliotekanauki.pl/articles/2171985.pdf
    Data publikacji:
    2022
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    heavy metals
    adsorption
    biosorbents
    lignin
    Opis:
    The overproduction of pollutants resulting from the development of industry causes the deposition of large amounts of toxic and carcinogenic substances, including heavy metals, in the aquatic ecosystem and other ecosystems. This is a civilisation problem of the present times, posing a serious threat to the natural environment, including humans. For this reason, it has recently become extremely important to develop effective methods to minimise the concentration of heavy metal ions in the aquatic systems and thus reduce their negative impact on the environment. One such technique is adsorption, which is believed to be an effective method of removing contaminants such as heavy metal ions from aqueous solutions. Looking at the available literaturę of the last few years, it can be concluded that adsorbents of natural origin are becoming more and more important. These are agricultural waste, all kinds of biomass, and waste from various industries. The study attempts to present and evaluate the sorption capacity of materials of natural origin, including oat bran, chitosan, alginate, tree bark, coconut fibre, and lignin. The use of such biosorbents is more friendly for the environment compared to their synthetic counterparts and perfectly fits the concept of sustainable development and the circular economy.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2022, 2 (151); 99--111
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Combined Adsorption of the Copper and Chromium Cations by Clinoptilolite of the Sokyrnytsya Deposit
    Autorzy:
    Sabadash, Vira
    Gumnitsky, Jaroslaw
    Lyuta, Oksana
    Powiązania:
    https://bibliotekanauki.pl/articles/123357.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    copper
    chromium
    heavy metals
    adsorption
    zeolite
    Opis:
    In the paper, the assessment of the impact of heavy metals on water objects, namely copper and chromium was performed, and the methods for their neutralization were defined. A scientifically grounded method for the selection of natural zeolite for the purification of wastewater from heavy metals has been developed, provided that they are jointly present. The physicochemical characteristics of two metals related to heavy metals are presented: copper and chromium. The methods for determining the sorption capacity of natural zeolite for copper and chromium compounds, as well as the methods of analytical control of the wastewater components were presented. The results of the experimental studies on the combined adsorption of copper and chromium cations by natural zeolite under static conditions were presented. The changes in the chemical composition of the zeolite surface as a result of heavy metal sorption have been investigated. The influence of the nature of the ions and the pH of the adsorption medium on the selectivity of the heavy metal ions extraction by zeolite was analyzed. A diagram of the composition of the solution, depending on the pH values, was constructed. The pH of the beginning of deposition of the corresponding heavy metal hydroxides on the zeolite surface was calculated. While analyzing the results of experimental studies on the combined adsorption of copper and chromium ions, it was found that the copper ions are significantly better adsorbed by the sorbent than the chromium ions. Despite the same concentration of the chromium and copper ions in solution, Cu2+ is extracted selectively. As can be seen from the results of experimental studies, the concentration of copper on the surface of the sorbent increases from 0.628% mass at a concentration of 0.01 g/dm3 to 47.380% mass at a concentration of 1 g/dm3. The studies on the static activity of clinoptilolite for the copper and chromium ions indicate a simultaneous mechanism of the process, which involves ion exchange and physical adsorption. The concentration of the chromium ions on the surface of the sorbent after adsorption depends on the increase of the concentration of Cr3+ in the original solution to a lesser extent. The results of the studies on the combined adsorption of the Cu2+ and Cr3+ ions indicate the possibility of their chromatographic separation, which makes their further use possible.
    Źródło:
    Journal of Ecological Engineering; 2020, 21, 5; 42-46
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polyurethane Loaded with Vegetable Activated Carbon for Heavy Metals Removal from Water
    Autorzy:
    El Malti, Wassim
    Hamieh, Mostafa
    Noaman, Amer
    El-Dine, Rim Nasser
    Hijazi, Akram
    Al-Khatib, Wassef
    Powiązania:
    https://bibliotekanauki.pl/articles/1955582.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    activated carbon
    adsorption
    banana stem
    heavy metals
    polyurethane
    Opis:
    The heavy metals pollutants resulting from industrial wastewater are a major environmental problem due to their toxicity and non-biodegradability. Their removal became a trending environmental subject. The preparation of low-cost and eco-friendly adsorbents for industrial wastewater treatment has been widely investigated. Furthermore, the use of polymeric material for this purpose is highly increasing. In this study, banana stem agro-waste was valorized by preparing and characterizing its derived activated carbon used as a filler to improve the adsorption performance of polyurethane foams. The loaded polyurethane was synthesized in the shape of pellets, characterized by SEM, and tested in removing Pb2+ and Cu2+ from aqueous solutions. The effects of activated carbon filler concentration, number of filtering passes, and pH were examined. The loaded polyurethane demonstrated a good adsorption capacity that was enormously improved compared to the unloaded polymer. 77% Pb2+ and 40% Cu2+ removal were reached after one filtering pass only. The optimum pH was determined to be 4. After the 10th pass, and at any pH, almost 100% of the studied metals were eliminated. Rapid and straightforward selectivity and seawater deionization tests were carried out and confirmed the capacity performance of the prepared pellets in removing different aqueous ions.
    Źródło:
    Journal of Ecological Engineering; 2021, 22, 9; 99-110
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removing Heavy Metals through Different Types of Soils and Marble Powder found in Oman
    Autorzy:
    Wazwaz, Aref
    Al-Salaymeh, Ahmed
    Khan, Mohd Shariq
    Powiązania:
    https://bibliotekanauki.pl/articles/124676.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    adsorption
    potable water
    silty soil
    sandy soil
    clay soil
    marble powder
    heavy metals removal
    Opis:
    In this research, adsorption followed by filtration was used for removing heavy metals (Cu, Zn, Mn, and Cr) from the polluted water. Three types of soils (silty, sandy and clay) and three types of marble powder (pure, impure, marble-granite mix) were used as an adsorbent. The soil and marble samples were collected from different regions of Oman. The maximum adsorption obtained was 96.01% for Zn using pure marble powder and the minimum adsorption obtained was 6.70% for Mn using impure marble powder. Through different soils, the maximum adsorption of 88.61% was achieved for Zn using clay and the lowest one is for Cr 16.51% using silty soil. The results suggest that among the marble powders, the pure ones show the maximum (96.01% for Zn) and marble-granite show the minimum (Mn 6.70%) adsorption performance. Among the adsorbents, Zn is the best adsorbate (96.01%) while the worst among the group is Mn, which merely adsorbed 6.70% with the selected adsorbents.
    Źródło:
    Journal of Ecological Engineering; 2019, 20, 4; 136-142
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zinc ion adsorption on carbon nanotubes in an aqueous solution
    Autorzy:
    Ansari, A.
    Mehrabian, M. A.
    Hashemipour, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/779155.pdf
    Data publikacji:
    2012
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    adsorption
    molecular dynamics simulation
    heavy metals
    electrostatic force
    interaction energy
    functional groups
    Opis:
    The literature devoted to numerical investigation of adsorption of heavy metal ions on carbon nanotubes is scarce. In this paper molecular dynamics is used to simulate the adsorption process and to investigate the effect of the infl uencing parameters on the rate of adsorption. The predictions of the molecular dynamics simulation show that the adsorption process is improved with increasing the temperature, pH of solution, the mass of nanotubes, and surface modifi cation of CNT using hydroxyl and carboxyl functional groups. The results predicted by the model are compared with the experimental results available in the literature; the close agreement validates the accuracy of the predictions. This study reveals that the water layers around the carbon nanotubes and the interaction energies play important roles in the adsorption process. The study also shows that electrostatic force controls the attraction of zinc ions on the nanotube sidewall.
    Źródło:
    Polish Journal of Chemical Technology; 2012, 14, 3; 29-37
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modification of Salix americana willow bark for removal of heavy metal ions from aqueous solutions
    Autorzy:
    Rypińska, Iwona
    Biegańska, Marta
    Powiązania:
    https://bibliotekanauki.pl/articles/779386.pdf
    Data publikacji:
    2014
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    waste
    adsorption
    heavy metals
    willow bark
    methods of modification
    Opis:
    Salix americana willow bark is a waste arising in the process of wicker decortication that so far has not found Any practical application. The bark can adsorb metal ions, because in its composition among others are phenolic groups which may be involved in the removal of metal ions from water solutions. The results of sorption of copper(II) and zinc(II) on modifi ed willow bark of Salix americana were presented. The bark was modifi ed with nitric and sulfuric acids at concentrations ranging from 5 to 15%. The best adsorption results were obtained using 15% nitric acid for modifi cation. Adsorption of metal ions from aqueous solutions at concentrations raging from 20 to 100 mg/dm3 was studied. It was found that an increase in the initial concentration of copper(II) and zinc(II) resulted in an increase in their adsorption on the modifi ed cortex.
    Źródło:
    Polish Journal of Chemical Technology; 2014, 16, 4; 41-44
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the Possibility of Heavy Metal Ions Removal from Aqueous Solutions on Fruit Pomace
    Autorzy:
    Krasowska, Małgorzata
    Kowczyk-Sadowy, Małgorzata
    Szatyłowicz, Ewa
    Obidziński, Sławomir
    Powiązania:
    https://bibliotekanauki.pl/articles/24201639.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    fruit pomace
    adsorption
    heavy metals
    Opis:
    Pomace from apples, grapes, blackcurrants, and oranges is a waste product of fruit processing, which is formed during the production of juices. Pomace is a rich source of biologically active compounds such as polyphenols, carotenoids, or vitamins. They also contain pectin, cellulose, lignin, proteins, and minerals. All these components, apart from having many beneficial properties for human health, also show sorption properties towards heavy metal ions. Therefore, this study aimed to evaluate the possibility of removing lead (II) and cadmium (II) ions from aqueous solutions by adding apple, grape, black currant, and orange pomace as well as to determine the adsorption efficiency of selected heavy metals. The studies were carried out in model systems. The results of the research showed that lead (II) and cadmium (II) ions are adsorbed on fruit pomace. The highest removal of cadmium (II) ions was observed in orange pomace and of lead (II) ions in apple pomace. The maximum tested cadmium ions absorption capacity was: 0.117235 mg/g in the case of freeze-dried apple pomace; 0.08618 mg/g in the case of freeze-dried currant pomace; 0.21915 m/g in the case of freeze-dried grape pomace and 0.29549 mg/g in the case of freeze-dried orange pomace. On the other hand, the maximum absorption of lead ions was: 0.457 mg/g in the case of freeze-dried apple pomace; 0.442 mg/g in the case of freeze-dried currant pomace; 0.3445 mg/g in the case of freeze-dried grape pomace and 0.421 mg/g in the case of freeze-dried orange pomace. On the basis of the performed measurements, it can be concluded that the tested waste can potentially be used as a cheap biosorbent for removing heavy metal ions from dilute aqueous solutions.
    Źródło:
    Journal of Ecological Engineering; 2023, 24, 3; 169--177
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Treatment of Effluents from Ions of Heavy Metals as Display of Environmentally Responsible Activity of Modern Businessman
    Autorzy:
    Malovanyy, Myroslav
    Sakalova, Halyna
    Vasylinycz, Tamara
    Palamarchuk, Olha
    Semchuk, Jaroslav
    Powiązania:
    https://bibliotekanauki.pl/articles/123985.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    ecological safety
    natural clay sorbents
    adsorption
    sedimentation
    regeneration
    ions of heavy metals
    Opis:
    This work is dedicated to the development of scientific technologies of sewage water clarification of different industrial enterprises from chrome and nickel ions through adsorption by bentonite from Cherkasy field under dynamic conditions. The perspective and efficiency of application of bentonite clays for treatment of sewage water are confirmed by their advantages over other sorbents, that is: they win in accessibility, cost, and possibility of regeneration and multiple usages. The studies proved the expediency of bentonite clays usage for treatment of sewage water from chrome (III), zinc (ІІ) and nickel (II) ions. The static activities were determined and isotherms of adsorption of nickel, zinc and chrome ions were built. Deposition by gravity was chosen as the most optimal method reset of spend sorbent. Dosage of flocculants allows accelerating the process and increasing the degree of deposition. The basic parameters of the precipitation process of the used sorbent were established. The technological schemes of drain water purification from heavy metal ions contamination were developed; in addition to the following sedimentation and regeneration of sorbents.
    Źródło:
    Journal of Ecological Engineering; 2019, 20, 4; 167-176
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption of Lead, Zinc, and Nickel Ions from Wastewater Using Coriander Seeds as an Adsorbent
    Autorzy:
    Shamkhi, Hibatallah Jamil
    Hussein, Tamara Kawther
    Powiązania:
    https://bibliotekanauki.pl/articles/2025731.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    coriander seed
    adsorption
    heavy metals
    isotherm model
    wastewater
    kinetic model
    Opis:
    This research focused on using coriander seeds as low cost adsorbent to remove heavy metals ions such as lead, zinc, and nickel from wastewater. Different parameters were studied to obtain the best results, such as pH, contact time, adsorbent dosage, concentration of initial metals and agitation speed. The highest results were obtained at pH 6, 105 min contact time, 1 g/100 ml dosage, 50 mg/l initial concentration of metal ions and 200 rpm agitation speed at temperature 25 ± 2 °C, which were 95.926%, 89.799% and 79.255% for lead, zinc and nickel ions, respectively. The results were also categorized as the Langmuir and Freundlich models, and found that the Freundlich isotherm fit the experimental data better than the Langmuir isotherm. The pseudo-second order was shown to have a high degree of fitness based on kinetic data. The adsorbent was characterized using a variety of techniques, including Fourier transform infrared spectroscopy (FTIR), Field Emission Scanning Electron Microscope (FESEM).
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 1; 158-168
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption of copper ions from aqueous solutions on natural zeolite
    Autorzy:
    Zendelska, A.
    Golomeova, M.
    Blazev, K.
    Krstev, B.
    Golomeov, B.
    Krstev, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/207459.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    adsorption
    natural zeolite
    clinoptilolite
    adsorption kinetics
    adsorption isotherms
    heavy metals removal
    adsorpcja
    naturalne zeolity
    klinoptylolit
    kinetyka adsorpcji
    izotermy adsorpcji
    usuwanie metali ciężkich
    Opis:
    The adsorption of copper ions from synthetic aqueous solutions on natural zeolite (clinoptilolite) was examined. In order to determine the rate of adsorption and the copper uptake at equilibrium, a series of experiments were performed under batch conditions from single ion solutions. Equilibrium data were evaluated based on adsorption (Langmuir and Freundlich) isotherms. The adsorption kinetics is reasonably fast. In the first 20 min of the experiment, approximately 80% of Cu2+ ions is adsorbed from the solutions. Data obtained from the kinetic experiments have been described by the pseudo-second order kinetic model as well as by the Weber–Morris and Furusawa–Smith models.
    Źródło:
    Environment Protection Engineering; 2015, 41, 4; 17-36
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of the strong magnetic field on copper adsorption processes on activated carbon
    Autorzy:
    Rajczykowski, K.
    Loska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/115895.pdf
    Data publikacji:
    2017
    Wydawca:
    Fundacja na Rzecz Młodych Naukowców
    Tematy:
    magnetic field modification
    copper adsorption
    heavy metals removal
    modyfikacja pola magnetycznego
    adsorpcja miedzi
    usuwanie metali ciężkich
    Opis:
    In the presented studies an influence of the strong static magnetic field on the process of copper adsorption on activated carbon was analysed. The magnetic field was generated by the annular neodymium magnets, placed at the bottom of the glass reactors, with the magnetic induction value at the surface equal 0.517 T. Additionally, during the study an effect of temperature on the adsorption process efficiency and its susceptibility to the external magnetic field was also investigated. As a result of the study, it was found that using a magnetic modification can increase the efficiency of the adsorption process up to 80%. However, such a strong influence of the external magnetic field was observed only in the case of relatively low initial and equilibrium concentration of the adsorbate. With the increase of the equilibrium concentration, stimulating nature of the magnetic field weakened significantly until finally at an equilibrium concentration about 80 mg/dm3, it was almost negligible. In addition, it was also found that the magnetic field modifications were much more efficient if the adsorption processes were conducted at the higher temperature.
    Źródło:
    Challenges of Modern Technology; 2017, 8, 2; 7-10
    2082-2863
    2353-4419
    Pojawia się w:
    Challenges of Modern Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Applying a Gouy–Chapman–Stern Model for Adsorption of Toxic Metals to Soils in Arsenic Affected Areas of Chhattisgarh
    Autorzy:
    Bhui, Ashish Kumar
    Sen, Satish Kumar
    Powiązania:
    https://bibliotekanauki.pl/articles/1031874.pdf
    Data publikacji:
    2020
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Electrostatic models
    Gouy-Chapman
    heavy metal Phytoremidation
    toxic metals
    Opis:
    An effective adsorption model was developed by S. Nir in 1978 for predicting adsorption to synthetic membranes and was also adapted by him afterwards to clay minerals. The main principles of the model are the solution of the electrostatic Gouy-Chapman equations while calculating the adsorbed amounts of the cations as the sum of those residing in the double-layer region and the cations that are chemically bound in a closed system. Thus, the equilibrium concentration in solution is influenced by the adsorption as the function of the amounts bound. The model was later developed and adapted for the adsorption of METAL cations, and, in most cases, the fit of calculated results to measured adsorbed amounts of cations was very good, after calibrating the model for the chemical tested, with only two adjustable parameters for each chemical. In the current work, we tested the applicability of this model for the adsorption of a monovalent and a divalent METAL cation by several soils, by considering the cation exchange capacities (CEC) and the specific surface areas (SSA) of the soils. For three out of four soils, a very good fit was obtained by using the required parameters for the calculations from previous studies of cation adsorption on clay minerals. The main advantage of the presented model over Langmuir and Freundlich adsorption isotherms is that no additional changes in the parameters were needed when the background concentration of salts in the suspensions was increased from 10 to 50 or 500 mM.
    Źródło:
    World News of Natural Sciences; 2020, 30, 2; 178-186
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal of Cadmium (II) by Adsorption Using Water Hyacinth (Eichhornia crassipes) Dried Biomass
    Autorzy:
    Rosidah
    Rahayu, Sata Yoshida Sri
    Susanti, Evi
    Powiązania:
    https://bibliotekanauki.pl/articles/24201797.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    heavy metals
    cadmium
    phytoremediation
    water hyacinth
    biosorbent
    Opis:
    Using water hyacinth as a phytoremediation agent produces abundant biomass due to periodic harvesting in the system. One of the alternative uses of water hyacinth biomass can be a bio-sorbent to absorb metal contamination in the waters. This study aims to determine the quality of activated water hyacinth bio-sorbent, potentially reducing metal cadmium (Cd). The research was conducted from January to April 2022. The results showed that the parameters of water content, iodine absorption, and methylene blue in water hyacinth bio-sorbent had met the quality standard of activated carbon based on SNI No. 06-3730-1995. In contrast, the ash content still did not. In water, hyacinth stem bio-sorbents (stems + ZnCl2 and stems 300 °C + ZnCl2) obtained higher ash content (25.87 and 73.30%) than the ash content of water hyacinth root and leaf bio-sorbent with the same activation treatment. The optimum adsorption capacity (Qe) for the roots + ZnCl2 occurred at a contact time of 45 minutes which was 8.13 mg/g with an absorption efficiency (Ef) of 34.20%. For the root 300 °C + ZnCl2, the optimum adsorption capacity and absorption efficiency occurred at a contact time of 8 hours, namely 9.08 mg/g and 38.66%, respectively. The optimum adsorption capacity and absorption efficiency of the leaves + ZnCl2 occurred at a contact time of 4 hours, namely 7.63 mg/g and 32.12%, respectively. Meanwhile, at the leaves 300 °C + ZnCl2, the optimum adsorption capacity and absorption efficiency occurred at a contact time of 8 hours with a value of Qe = 11.84 mg/g and Ef = 49.35%.
    Źródło:
    Journal of Ecological Engineering; 2023, 24, 3; 246--253
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Equilibrium and kinetic studies on the removal of heavy metal ions with natural low-cost adsorbents
    Autorzy:
    Varank, G.
    Demir, A.
    Bilgili, M. S.
    Top, S.
    Sekman, E.
    Yazici, S.
    Erkan, H. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/207257.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    adsorbents
    adsorption
    bentonite
    dyes
    heavy metals
    kinetics
    metal ions
    water treatment
    heavy metal removal
    heavy metal ions
    heavy metals ions removal
    adsorbenty
    adsorpcja
    bentonit
    barwniki
    metale ciężkie
    kinetyka
    jony metali
    usuwanie jonów metali ciężkich
    uzdatnianie wody
    Opis:
    Adsorption isotherms and kinetics of the removal of heavy metal ions (Ni, Pb, Zn) from aqueous solutions by natural adsorbents (zeolite, bentonite, clay) were investigated in a lab-scale batch study. The effect of various parameters such as adsorbent dosage, initial concentration of heavy metal ions, temperature, and agitation time were studied to optimise the conditions. Under those optimized conditions (180 rpm agitation rate, 120 min agitation time, pH 4.0, 298 K, 100 mg/dm3 initial adsorbate concentration), the removal percentages of heavy metal ions for natural adsorbents have been determined. The adsorption mechanisms and characteristic parameters of the process were analyzed by two and three parameter isotherm models (Langmuir, Freundlich, Temkin, Redlich-Peterson, Toth and Sips), and kinetic models (Lagergren's pseudo-first order, Ho and McKay's pseudo-second order). Adsorption thermodynamics of heavy metal ions (changes of standard enthalpy, entropy and free energy) on zeolite, bentonite and clay were also studied at 298,318 and 338 K.
    Źródło:
    Environment Protection Engineering; 2014, 40, 3; 43-61
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Potassium Hydroxide Activated Peanut Shell as an Effective Adsorbent for the Removal of Zinc, Lead and Cadmium from Wastewater
    Autorzy:
    Maki, Rusol
    Qasim, Bashar
    Powiązania:
    https://bibliotekanauki.pl/articles/2202316.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    adsorption
    activated peanut shell
    heavy metals
    wastewater
    Opis:
    The toxic heavy metals, as non-biodegradable pollutants, have become a serious threat to aquatic environment. This study aimed to assess the efficiency of the low cost, available and environment-friendly peanut shell as an effective adsorbent for the removal of Zn, Pb and Cd from wastewater. The peanut shell was prepared by carbonization by pyrolysis process at 550 °C, activated with 7M potassium hydroxide(KOH) at 750 °C, and then characterized by using Scanning Electron Microscopy (SEM), and Fourier Transform Infrared spectroscopy (FTIR), X-ray diffraction (XRD) and Brunauer-Emmett-Teller (BET) surface area analysis. The optimum conditions for metal ions adsorption were investigated as a function of various parameters. The optimum conditions included: pH of 6, initial metal concentrations of 20 mg/l for Pb and Zn as well as 40 mg/l for Cd, adsorbent mass of 2 g, optimum temperature of 45 °C and the preferable contact time of 60 min. The removal percent for the studied metal ions exceeded 98%. The adsorption isotherm showed that the Langmuir model was the best fitted model for the metal ions adsorption onto activated peanut shell surface, and the kinetic of adsorption followed the pseudo-first order model. The obtained results showed that the KOH-activated peanut shell possess higher adsorption efficiency for the removal of the studied metal ions from wastewater.
    Źródło:
    Journal of Ecological Engineering; 2023, 24, 1; 66--78
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Controlled synthesis of iron oxide nanoparticles used as an efficient heavy metal ions adsorbent
    Kontrolowana synteza nanocząstek tlenków żelaza stosowanych jako efektywny adsorbent jonów metali ciężkich
    Autorzy:
    Bobik, M.
    Korus, I.
    Brachmańska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/127234.pdf
    Data publikacji:
    2015
    Wydawca:
    Towarzystwo Chemii i Inżynierii Ekologicznej
    Tematy:
    adsorption
    heavy metals
    magnetite
    nanoparticles
    adsorpcja
    metale ciężkie
    magnetyt
    nanocząstki
    Opis:
    In this paper a few attempts of iron oxide nanoparticles synthesis via chemical co-precipitation are presented. Iron(II) and (III) salts were used as a precursors and aqueous ammonia as a precipitation medium. In the literature it was proved that there are some factors, like reaction temperature, base amount (pH of the reaction mixture) or the concentration of iron salts, which affects characteristics of formed nanoparticles such as their size distribution. The aim of presented research was to select such reaction parameters which would lead to the production of the most effective sorbent for few heavy metal ions, such as: Cr(VI), Pb(II), Cr(III), Cu(II), Zn(II), Ni(II) and Cd(II). The synthesis of nanoparticles were carried out for three temperatures (30, 60, 90ºC) and three ammonia volumes (8, 10, 15 cm3) for each temperature. Furthermore the influence of iron salts molar ratio Fe(II) : Fe(III) in the reaction mixture on resulting sorbent was examined. Because the syntheses were lead in the oxidizing environment, in order to compensate partial oxidation of Fe(II) to Fe(III), a few molar ratios Fe(II) : Fe(III) beyond the stoichiometric value (which is 1 : 2 for magnetite Fe3O4) were investigated. Additionally for the magnetite synthesized in the selected conditions the effect of pH on the sorption of heavy metal ions were examined. The pH conditions were estimated to not exceed 7 in order to avoid metal precipitation.
    W pracy przedstawiono próby syntezy nanocząstek tlenków żelaza poprzez ich chemiczne współstrącanie. Jako medium strącające zastosowano wodę amoniakalną. W literaturze udowodniono wpływ takich czynników, jak temperatura reakcji, ilość zasady czy też stężenie soli żelaza Fe(II) i Fe(III) w mieszaninie reakcyjnej na charakterystykę, między innymi wielkość, powstających nanocząstek. Celem niniejszej pracy było dobranie takich parametrów reakcji, aby w efekcie uzyskać najbardziej efektywny sorbent względem jonów kilku metali ciężkich: Cr(VI), Pb(II), Cr(III), Cu(II), Zn(II), Ni(II) i Cd(II). Przeprowadzono syntezę nanocząstek w kombinacji trzech temperatur: (30, 60, 90ºC) oraz trzech objętości amoniaku: (8, 10, 15 cm3). Ponadto sprawdzono, jaki wpływ na powstający sorbent ma stosunek molowy jonów żelaza Fe(II) : Fe(III) w mieszaninie reakcyjnej. Biorąc pod uwagę fakt, iż synteza przeprowadzana była przy dostępie tlenu, w celu kompensacji częściowego utlenienia jonów żelaza Fe(II) do Fe(III), wyjściowy stechiometryczny stosunek tych jonów, który dla magnetytu (Fe3O4) wynosi 1:2, obniżono do kilku wartości poniżej 1 : 2. Dodatkowo dla magnetytu zsyntezowanego w wybranych, optymalnych, warunkach przeprowadzono próbę wpływu pH na sorpcję jonów metali. W celu uniknięcia możliwości wytrącania się osadów maksymalne pH ustalono na nieprzekraczające wartości 7.
    Źródło:
    Proceedings of ECOpole; 2015, 9, 2; 413-424
    1898-617X
    2084-4557
    Pojawia się w:
    Proceedings of ECOpole
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The kinetics, thermodynamics and equilibrium study of nickel and lead uptake using corn residues as adsorbent
    Autorzy:
    Tejada-Tovar, Candelaria
    Villabona-Ortíz, Ángel
    Gonzalez-Delgado, Angel Darío
    Powiązania:
    https://bibliotekanauki.pl/articles/1844359.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    adsorption
    corn wastes
    heavy metals
    kinetics
    thermodynamics
    Opis:
    Agricultural residues rich in lignocellulosic biomass are low-cost and sustainable adsorbents widely used in water treatment. In the present research, thermodynamics, kinetics, and equilibrium of nickel(II) and lead(II) ion biosorption were studied using a corncob (Zea mays). The experiments were performed in a batch system evaluating the effect of temperature and dose of adsorbent. Langmuir and Freundlich isotherms were used to study the equilibrium. Thermodynamic and kinetic parameters were determined using kinetic models (pseudo-first order, pseudo-second order, Elovich). Biosorbent characteristics were studied by Fourier-transform infrared spectroscopy, Scanning Electron Microscopy and Energy-dispersive X-ray spectroscopy. It was found that the hydroxyl, carboxyl, and phenolic groups are the major contributors to the removal process. Besides, Pb(II) ions form micro-complexes on the surface of the biomaterial while Ni(II) ions form bonds with active centers. It was found that the highest Ni(II) removal yields were achieved at 0.02 g of adsorbent and 70°C, while the highest Pb(II) removal yields were achieved at 0.003 g and 55°C. A maximum Ni(II) adsorption capacity of 3.52 mg∙g–1 (86%) and 13.32 mg∙g–1 (94.3%) for Pb(II) was obtained in 250 and 330 min, respectively. Pseudo-first order and pseudo-second order models best fit experimental data, and Langmuir and Freundlich models well describe the isotherm of the process. Thermodynamic parameters (ΔH0, ΔG0, ΔS0) suggest that the adsorption process of both cations is exothermic, irreversible, and not spontaneous.
    Źródło:
    Journal of Water and Land Development; 2021, 48; 197-204
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie SSN w modelowaniu równowagi sorpcyjnej jonów metali ciężkich na klinoptylolicie
    Application of ANN to the sorption equilibrium modelling of heavy metal ions on clinoptilolite
    Autorzy:
    Tomczak, E.
    Kamiński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/125729.pdf
    Data publikacji:
    2012
    Wydawca:
    Towarzystwo Chemii i Inżynierii Ekologicznej
    Tematy:
    sztuczne sieci neuronowe
    równowaga adsorpcyjna
    jony metali ciężkich
    klinoptylolit
    artificial neural network
    adsorption equilibrium
    heavy metals ions
    clinoptilolite
    Opis:
    Zainteresowanie sztucznymi sieciami neuronowymi potwierdza wzrost publikacji z dziedziny inżynierii chemicznej, procesowej i ochrony środowiska. Po doborze odpowiedniej architektury sieci i metody uczenia można przystąpić do trenowania sieci na podstawie przeprowadzonych eksperymentów. W takim podejściu nie jest wymagana znajomość matematycznego opis procesu/obiektu. W pracy przedstawiono możliwość przewidywania izoterm sorpcji za pomocą perceptronu wielowarstwowego (MLP) w układach jedno-, dwui wieloskładnikowych. Obliczenia neuronowe oparto na badaniach eksperymentalnych przeprowadzonych dla układu klinoptylolit - mieszanina jonów metali ciężkich: Cu(II), Zn(II), i Ni(II). Jakość obliczeń sprawdzono za pomocą kwadratu współczynnika determinacji i średniego błędu kwadratowego, uzyskując wysoce zadowalające wyniki. Stwierdzono przydatność klinoptylolitu do usuwania jonów metali ciężkich z roztworu. Określono selektywność tego zeolitu zgodnie z szeregiem: Cu(II) > Zn(II) > Ni(II).
    The latest achievements in the field of mathematical modelling include the application of artificial neural networks (ANN). A recent dynamic development of ANN provided an efficient and universal tool that is used to solve many tasks, including modelling, approximation and identification of objects. The initial step of applying the network to a given process consists in the determination of weights of the proposed neural network structure. This is performed on the basis of training data. A network that is properly trained allows correct information to be obtained on the basis of other data which have not been used in the network training. In most cases the network training is performed on the basis of a known mathematical model. However, the training of a network can be also performed using experimental data. In the last decade a growing interest is observed in inexpensive and very cheap adsorbents to remove heavy metal ions. Clinoptilolite is the mineral sorbent extracted in Poland used to remove heavy metal ions from diluted solutions. Equilibrium experiments were carried out to estimate sorptivity of a clinoptilolite and its selectivity towards Cu(II), Zn(II) and Ni(II) ions in multicomponent solution. Calculations with the use of MLP enabled description of sorption isotherms for when one, two and three ions were present at the same time in the solution. The network also enabled an analysis of sorption of the selected ion, taking into account the effect of its concentration.
    Źródło:
    Proceedings of ECOpole; 2012, 6, 2; 664-669
    1898-617X
    2084-4557
    Pojawia się w:
    Proceedings of ECOpole
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biosorption of Heavy Metals from Synthetic Wastewater by Using Macro Algae Collected from Iraqi Marshlands
    Autorzy:
    Bahaa, Shaymaa
    Al-Baldawi, Israa Abdulwahab
    Yaseen, Safaa Rasheed
    Abdullah, Siti Rozaimah Sheikh
    Powiązania:
    https://bibliotekanauki.pl/articles/123810.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    adsorption
    Cladophora
    copper
    cadmium
    chromium
    aqueous solutions
    Opis:
    Biosorption is fast, effective and low cost process. It takes place in a wide range of temperature and it can be used for almost all types of heavy metals. The aim of this study was to investigate the ability of locally collected green macro algae to remove copper, chromium and cadmium from synthetic wastewater. The fresh algae were converted into dry powder as biosorbent. In the investigations, 1 g of macro algae powder was exposed to synthetic waste water contaminated with 10 mg/L concentration of copper, chromium and cadmium in separate exposure for 2 hours. The best removal efficiency for copper, chromium and cadmium were 70%, 80% and 85%, respectively, from the initial concentration of 10 mg/L. While macro algae are abundantly available in marshlands of south Iraq, it can be preferably utilized as biosorbent to remove heavy metals from the industrial wastewater.
    Źródło:
    Journal of Ecological Engineering; 2019, 20, 11; 18-22
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    MgFe-doubled layers hydroxide intercalated with low cost local adsorbent using for removal of lead from aqueous solution
    Autorzy:
    Abdul-Hameed, Hayder M.
    Al Juboury, Maad F.
    Powiązania:
    https://bibliotekanauki.pl/articles/292557.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    adsorption
    agriculture waste
    composite adsorbent
    heavy metals
    leaf date palm
    Opis:
    A new composite adsorbent was prepared by modifying low cost local adsorbent (LCL) using MgFe layered double hydroxide (LDH). This low cost local adsorbent was also prepared from the activation of date palm leaf derived from agricultural waste. In comparison to the low LCL, the adsorption capacity of the new composite adsorbent (LCL/MgFe-LDH) was improved. This was measured in terms of its ability to remove lead from wastewater. The Scanning electron microscope (SEM), Energy dispersive spectroscopy (EDS), Fourier-transform infrared spectroscopy (FTIR) and the specific surface area by the (Brunauer, Emmett and Teller) theory (BET) tests were conducted for the characterisation of LCL and LCL/MgFe-LDH. The behaviour of the lead adsorption processes by using LCL/MgFe-LDH as adsorbent was investigated in batch experiments by examining different values of solution pH, contact time, adsorbent dose and initial Pb2+ concentration. High removal efficiency was exhibited by LCL/MgFe-LDH, a value almost double that of LCL. This was attributed to the increase in surface area of LCL/MgFe-LDH (79.7 m2·g–1) in contrast to the surface area of LCL (24.5 m2·g–1). The Freundlich equations and pseudo-second-order kinetics model were appropriate for the provision of adsorption equilibrium data for Pb2+ on adsorbents. These results reveal the great potential of the new composite adsorbent (LCL/MgFe-LDH) if applied to the absorption of heavy metal ions.
    Źródło:
    Journal of Water and Land Development; 2020, 45; 10-18
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of organic waste for adsorption of Zn(II) and Cd(II) ions
    Autorzy:
    Bakalár, Tomáš
    Pavolová, Henrieta
    Powiązania:
    https://bibliotekanauki.pl/articles/208191.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    cadmium
    zinc
    hazelnut
    orange peel
    heavy metals
    Freundlich isotherm
    kadm
    cynk
    orzech laskowy
    skórka pomarańczowa
    metale ciężkie
    Izoterma Freundlicha
    Opis:
    Biosorption of Zn(II) and Cd(II) ions from aqueous solutions onto organic waste – orange peel, hazelnut shell, and walnut shell was studied using batch adsorption experiments. In the biosorption studies, equilibrium metal ion concentration was determined. Experimental data obtained were analysed in terms of Freundlich, Langmuir, Temkin, Dubinin–Radushkevich, Redlich–Peterson, Sips, Toth, and Khan isotherms. The results of the study showed that orange peel, hazelnut shell, and walnut shell can be adequately used as low-cost alternatives for the removal of Zn(II) and Cd(II) ions from aqueous solutions with maximum sorption capacities of 15.51 and 19.8 mg/g, 11.55 and 16.65 mg/g, and 26.60 and 21.10 mg/g, respectively. The highest removal efficiency of Zn(II) and Cd(II) ions was obtained for hazelnut shells. The process was fast and about 90% of metal ions were removed by all the studied biosorbents. The sorption process was possibly chemisorption occurring on a heterogeneous surface.
    Źródło:
    Environment Protection Engineering; 2019, 45, 2; 35-54
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Utilization of agricultural and industrial wastes for metal removal from aqueous solutions
    Autorzy:
    Biegańska, M.
    Cierpiszewski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/779295.pdf
    Data publikacji:
    2011
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    odpady
    adsorpcja
    metale ciężkie
    toksyczność
    kora wierzby
    izoterma Freundlicha
    kinetyka
    waste
    adsorption
    heavy metals
    toxicity
    wicker bark
    Freundlich isotherm
    kinetic
    Opis:
    In this study a possibility of obtaining sorbents from basketry wastes has been investigated. Therefore, adsorption of cadmium ions on wicker bark of Salix americana has been studied. The obtained experimental results were described by the Freundlich equation and adsorption kinetics by the pseudo-second order equation. The effect of pH on cadmium ions adsorption by S. americana was also investigated. It has been found that for the pH values ranging from 2 to 7 cadmium removal from the solution was held at almost constant level.
    Źródło:
    Polish Journal of Chemical Technology; 2011, 13, 1; 20-22
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prediction of Co(II) and Ni(II) ions removal from wastewater using artificial neural network and multiple regression models
    Autorzy:
    Allahkarami, E.
    Igder, A.
    Fazlavi, A.
    Rezai, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/109455.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    artificial neural network
    nonlinear multi-variable regression
    heavy metals
    adsorption
    Opis:
    In this research, carboxymethyl chitosan-bounded Fe3O4 nanoparticles were synthesized and used for removal of Co(II) and Ni(II) ion metals from wastewater. The capability of magnetic nanoparticles for metal ions removal was investigated under different conditions namely pH, initial concentration of metal ions and adsorbent mass. The assessment of adsorbent performance for metal ions removal under different conditions requires cost and time spending. In this regard, the capability of artificial neural network (ANN) and nonlinear multi-variable regression (MNLR) models were investigated for predicting metal ions removal. The values of operational parameters such as pH, contact time, initial concentration of metal ions and adsorbent mass were applied for simulation by means of ANN and MNLR. A back propagation feed forward neural network, with one hidden layer (4:8:2), was proposed. Two criteria, including mean square error (MSE) and coefficient of determination (R2) were used to evaluate the performance of models. The results showed that two models satisfactorily predicted the adsorbed amount of metal ions from wastewater. However, the ANN model with higher R2 and lower MSE than the MNLR model had better performance for predicting the adsorbed amount of metal ions from wastewater.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2017, 53, 2; 1105-1118
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The use of agro-industrial residues of coffee (Coffea arabica) for the removal of mercury from water
    Autorzy:
    Tejada-Tovar, Candelaria N.
    Rocha-Caicedo, María M.
    Paz-Astudillo, Isabel C.
    Powiązania:
    https://bibliotekanauki.pl/articles/2203551.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    agro-industrial residue
    bio-adsorption
    encapsulation
    heavy metals
    isotherms
    Opis:
    Contamination of water bodies by heavy metals is a continuously growing environmental issue. High concentrations of mercury (Hg) in river waters are a recognized environmental problem, because it is one of the most toxic heavy metal ions as it causes damage to the central nervous system. Its negative impact has led to the development of different methods for the treatment of effluents contaminated with Hg(II). The aim of this article is to evaluate the use of coffee (Coffea arabica) residues as adsorbent of Mercury in an aqueous solution. Four kinetic models, including intraparticle diffusion, pseudo-first-order, pseudo-second-order, and Elovich kinetic models were applied to explore the internal mechanism of mercury adsorption. Results indicate that the pseudo-first-order and pseudo-second-order models could accurately describe the adsorption process. It means that chemical adsorption play an important role in the adsorption of mercury by activated carbon. Meanwhile, the external mass transfer process is more effective in controlling the activated carbon mercury adsorption according to the fitting result of the pseudo-first-order model. The fitting to Langmuir’s model suggested that the material surface is energetically homogeneous. The technique of contaminated biomass encapsulation proved to be safe for short-term disposal when metal recovery is not desired.
    Źródło:
    Journal of Water and Land Development; 2023, 56; 164--171
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Skuteczność syntetycznych zeolitów w usuwaniu metali ciężkich i substancji organicznych z roztworów wodnych
    Autorzy:
    Medykowska, Magdalena
    Powiązania:
    https://bibliotekanauki.pl/articles/2200426.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    adsorpcja
    usuwanie metali ciężkich
    układy mieszanych adsorbatów
    podwójna warstwa elektryczna
    syntetyczne zeolity
    adsorption
    heavy metals removal
    mixed adsorbate systems
    electrical double layer
    synthetic zeolites
    Opis:
    Effectiveness of synthetic zeolites in removal of heavy metals and organic substances from aqueous solutions
    Źródło:
    Wiadomości Chemiczne; 2023, 77, 1-2; 97--117
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of magnetite nanoparticles synthesis conditions on their ability to separate heavy metal ions
    Wpływ warunków syntezy nanocząstek magnetytu na ich zdolność do separacji jonów metali ciężkich
    Autorzy:
    Bobik, M.
    Korus, I.
    Dudek, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/205007.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    iron oxide nanoparticles
    co-precipitation
    heavy metals separation
    adsorption
    nanocząstki tlenku żelaza
    chemiczne współstrącanie
    metale ciężkie
    separacja metali ciężkich
    adsorpcja
    Opis:
    Magnetite nanoparticles have become a promising material for scientific research. Among numerous technologies of their synthesis, co-precipitation seems to be the most convenient, less time-consuming and cheap method which produces fine and pure iron oxide particles applicable to environmental issues. The aim of the work was to investigate how the co-precipitation synthesis parameters, such as temperature and base volume, influence the magnetite nanoparticles ability to separate heavy metal ions. The synthesis were conducted at nine combinations of different ammonia volumes - 8 cm3, 10 cm3, 15 cm3 and temperatures - 30°C, 60°C, 90°C for each ammonia volume. Iron oxides synthesized at each combination were examined as an adsorbent of seven heavy metals: Cr(VI), Pb(II), Cr(III), Cu(II), Zn(II), Ni(II) and Cd(II). The representative sample of magnetite was characterized using XRD, SEM and BET methods. It was observed that more effective sorbent for majority of ions was produced at 30°C using 10 cm3 of ammonia. The characterization of the sample produced at these reaction conditions indicate that pure magnetite with an average crystallite size of 23.2 nm was obtained (XRD), the nanosized crystallites in the sample were agglomerated (SEM) and the specific surface area of the aggregates was estimated to be 55.64 m2·g-1 (BET). The general conclusion of the work is the evidence that magnetite nanoparticles have the ability to adsorb heavy metal ions from the aqueous solutions. The effectiveness of the process depends on many factors such as kind of heavy metal ion or the synthesis parameters of the sorbent.
    Nanocząstki magnetytu stanowią obiecujący materiał badań ze względu na możliwość ich praktycznego zastosowania w różnorodnych dziedzinach. Wśród wielu metod ich syntezy, jako jedną z najwygodniejszych, najmniej pracochłonnych oraz ekonomicznych, wyróżnić można chemiczne współstrącanie. Efektem metody chemicznego współstrącania są drobne nanocząstki tlenku żelaza o dużej czystości, odpowiednie do zastosowań w zagadnieniach środowiskowych. Celem pracy było badanie w jaki sposób warunki syntezy chemicznego współstrącania, takie jak temperatura reakcji czy też ilość użytej zasady wpływają na zdolności separacyjne nanocząstek magnetytu względem jonów kilku metali ciężkich. Syntezy prowadzone były w dziewięciu kombinacjach przy różnej objętości dodawanego amoniaku – 8 cm3, 10 cm3, 15 cm3 oraz temperaturze – 30°C, 60°C, 90°C. Powstałe podczas każdej z syntez tlenki żelaza były badane jako adsorbenty jonów siedmiu metali ciężkich: Cr(VI), Pb(II), Cr(III), Cu(II), Zn(II), Ni(II) and Cd(II). Ponadto próbka magnetytu zsyntezowanego w wybranych warunkach była badana przy użyciu metod XRD, SEM oraz BET. Analizując wyniki procesu sorpcji stwierdzono, iż najbardziej efektywny materiał, dla większości metali ciężkich, powstał w temperaturze 30°C przy użyciu 10 cm3 amoniaku. Dodatkowa charakterystyka powstałego w tych warunkach sorbentu wykazała, iż stanowił on czysty magnetyt o średniej wielkości ziarna 23,2 nm (XRD). Ponadto wykazano, iż pojedyncze ziarna w badanej próbce są zaglomerowane (SEM) a powierzchnia właściwa agregatów wynosi 55,64 m2/g (BET). Ogólnym wnioskiem z pracy jest dowód, iż warunki syntezy badanego adsorbentu mają wpływ na jego zdolność separacyjne względem niektórych jonów metali ciężkich.
    Źródło:
    Archives of Environmental Protection; 2017, 43, 2; 3-9
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface modified bentonite mineral as a sorbent for $Pb^{2+}$ and $Zn^{2+}$ ions removal from aqueous solutions
    Autorzy:
    Selim, K.haled A.
    Rostom, Merit
    Youssef, Mohhamed A.
    Abdel-Khalek, Nagui A.
    Abdel-Khalek, Mohhamed A.
    Hassan, El-Sayed R. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1450133.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Ca-montmorillonite
    adsorption
    heavy metals
    surface modification
    rheology
    Opis:
    Environmental pollution by lead ($Pb^{2+}$) and zinc ($Zn^{2+}$) ions has become an important issue due to its harmful effects on human health and environment. This work aims to evaluate the application of surface modified Egyptian bentonite mineral by acid activation using $H_2SO_4$ and thermal treatment as an adsorbent to remove lead ($Pb^{2+}$) and zinc ($Zn^{2+}$) ions from aqueous solution. X-ray diffraction (XRD), Fourier Transformed Infrared Spectroscopy (FTIR) and Scanning Electron Microscope (SEM) techniques were used to investigate the modified bentonite. The impact of organic and inorganic dispersants on rheological characteristics of bentonite suspensions was investigated. Adsorption of $Pb^{2+}$ and $Zn^{2+}$ ions using modified bentonite mineral was performed with different adsorbent doses and pH values. Removal efficiencies of lead and zinc are 99.67% and 99%, respectively with adsorbent dose of 25 g/l at pH of 6.2.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 6; 145-157
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal of Fe++ from Wastewater Using Sludge-polymer Hybrid Adsorbents
    Usuwanie Fe++ ze ścieków przy użyciu hybrydowych adsorbentów osadowo-polimerowych
    Autorzy:
    Abdel-Aziz, M. H.
    Gutub, S.
    Soliman, M. F.
    Bassyouni, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1815483.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    heavy metals
    sewage sludge
    polymers
    hybrid adsorbents
    adsorption isotherm
    metale ciężkie
    osady ściekowe
    polimery
    hybrydowe adsorbenty
    izoterma adsorpcji
    Opis:
    Removal of Fe++ by adsorption on sludge-polymer hybrid adsorbents was studied. Sludge was collected from domestic disposal wastewater. Thermal treatment of sludge particles was carriedout at 200, 400 and 600°C to improve adsorption capacity. Polyvinylidene fluoride (PVDF) commercial polymer was mixed with the sludge in different mass ratios. Surface morphology and chemical structure of treated sludge were investigated using SEM and FTIR. Parameters studied are initial concentration of Fe++, contact time, sludge dose, heat treatment of the sludge, and sludge/polymer mixing ratio. Within the present range of studied parameters the removal efficiency of Fe++increases with in-creasing sludge dose. Increasing initial concentration of Fe++from 50 to 100 ppm increases the removal efficiency by a factor of maximum of 1.73. Fur-ther increasing in concentration from 100 to 150 ppm leads to decrease in removal efficiency up to 43%. Sludge-PVDF hybrid adsorbent improved removal efficiency up to 63.6%. Experimental data fits to Freundlich linear model. The mechanism of adsorption of Fe++ by sludge adsorbent was found to take place through a monolayer and heterogeneous surface. Potential applications of the present data in removing heavy metals from industrial waste solutions were highlighted.
    W pracy badano usuwanie Fe++ za pomocą adsorpcji na osadowo-polimerowych adsorbentach hybrydowych. Osady pobrano z oczyszczalni ścieków komunalnych. Obróbkę termiczną osadu prowadzono w temperaturze 200, 400 i 600°C, w celu poprawy zdolności adsorpcyjnych. Fluorek poliwinylidenu (PVDF) – handlowy polimer – mieszano z osadami w różnych stosunkach masowych. Morfologia powierzchni i struktura chemiczna przetworzonego osadu była badana za pomocą SEM i FTIR. Badane parametry niezależne to: początkowe stężenie Fe++, czas kontaktu, dawka osadu, obróbka termiczna osadu, udział osadu/polimeru w mieszance. W badanych zakresach zmienności parametrów niezależnych, efektywność usuwania Fe++ wzrasta wraz ze wzrostem dawki osadu. Zwiększenie początkowego stężenia Fe++ z 50 do 100 ppm zwiększa skuteczność usuwania o współczynnik wynoszący maksymalnie 1,73. Dalsze zwiększanie stężenia od 100 do 150 ppm, prowadzi do zmniejszenia skuteczności usuwania do 43%. Hybrydowy adsorbent poprawił skuteczność usuwania aż do 63,6%. Dane doświadczalne odpowiadają liniowej izotermie Freundlicha. Adsorpcja Fe++ przez adsorbent osadowy zachodzi poprzez monowarstwę i heterogeniczną powierzchnię. Podkreślono możliwość zastosowania uzyskanych wyników do usuwaniu metali ciężkich ze ścieków przemysłowych.
    Źródło:
    Rocznik Ochrona Środowiska; 2016, Tom 18, cz. 1; 28-45
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal of Fe++ from Wastewater Using Sludge-polymer Hybrid Adsorbents
    Usuwanie Fe++ ze ścieków przy użyciu hybrydowych adsorbentów osadowo-polimerowych
    Autorzy:
    Abdel-Aziz, M. H.
    Gutub, S.
    Soliman, M. F.
    Bassyouni, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1815484.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    heavy metals
    sewage sludge
    polymers
    hybrid adsorbents
    adsorption isotherm
    metale ciężkie
    osady ściekowe
    polimery
    hybrydowe adsorbenty
    izoterma adsorpcji
    Opis:
    Removal of Fe++ by adsorption on sludge-polymer hybrid adsorbents was studied. Sludge was collected from domestic disposal wastewater. Thermal treatment of sludge particles was carriedout at 200, 400 and 600°C to improve adsorption capacity. Polyvinylidene fluoride (PVDF) commercial polymer was mixed with the sludge in different mass ratios. Surface morphology and chemical structure of treated sludge were investigated using SEM and FTIR. Parameters studied are initial concentration of Fe++, contact time, sludge dose, heat treatment of the sludge, and sludge/polymer mixing ratio. Within the present range of studied parameters the removal efficiency of Fe++increases with in-creasing sludge dose. Increasing initial concentration of Fe++from 50 to 100 ppm increases the removal efficiency by a factor of maximum of 1.73. Fur-ther increasing in concentration from 100 to 150 ppm leads to decrease in removal efficiency up to 43%. Sludge-PVDF hybrid adsorbent improved removal efficiency up to 63.6%. Experimental data fits to Freundlich linear model. The mechanism of adsorption of Fe++ by sludge adsorbent was found to take place through a monolayer and heterogeneous surface. Potential applications of the present data in removing heavy metals from industrial waste solutions were highlighted.
    W pracy badano usuwanie Fe++ za pomocą adsorpcji na osadowo-polimerowych adsorbentach hybrydowych. Osady pobrano z oczyszczalni ścieków komunalnych. Obróbkę termiczną osadu prowadzono w temperaturze 200, 400 i 600°C, w celu poprawy zdolności adsorpcyjnych. Fluorek poliwinylidenu (PVDF) – handlowy polimer – mieszano z osadami w różnych stosunkach masowych. Morfologia powierzchni i struktura chemiczna przetworzonego osadu była badana za pomocą SEM i FTIR. Badane parametry niezależne to: początkowe stężenie Fe++, czas kontaktu, dawka osadu, obróbka termiczna osadu, udział osadu/polimeru w mieszance. W badanych zakresach zmienności parametrów niezależnych, efektywność usuwania Fe++ wzrasta wraz ze wzrostem dawki osadu. Zwiększenie początkowego stężenia Fe++ z 50 do 100 ppm zwiększa skuteczność usuwania o współczynnik wynoszący maksymalnie 1,73. Dalsze zwiększanie stężenia od 100 do 150 ppm, prowadzi do zmniejszenia skuteczności usuwania do 43%. Hybrydowy adsorbent poprawił skuteczność usuwania aż do 63,6%. Dane doświadczalne odpowiadają liniowej izotermie Freundlicha. Adsorpcja Fe++ przez adsorbent osadowy zachodzi poprzez monowarstwę i heterogeniczną powierzchnię. Podkreślono możliwość zastosowania uzyskanych wyników do usuwaniu metali ciężkich ze ścieków przemysłowych.
    Źródło:
    Rocznik Ochrona Środowiska; 2016, Tom 18, cz. 1; 28-45
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ modyfikacji chemicznej lotnego popiołu węglowego na adsorpcję jonów ołowiu(II) w obecności jonów kadmu(II) w układzie jedno- i dwuskładnikowym
    Effect of chemical modification of the coal fly ash onto adsorption of lead(ii) ions in the presence of cadmium(ii) ions in a singleand bi-component system
    Autorzy:
    Soco, E.
    Kalembkiewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/297328.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    lotny popiół węglowy
    metale ciężkie
    adsorpcja
    izotermy
    kinetyka
    coal fly ash
    heavy metals
    adsorption
    isotherms
    kinetics
    Opis:
    Celem badań było określenie wpływu modyfikacji chemicznej odpadowego lotnego popiołu węglowego (FA) za pomocą roztworów HNO3, CH3COONH4 (AcNH4), NaOH oraz dietyloditiokarbaminianu sodu (NaDDTC) na adsorpcję jonów ołowiu(II) w obecności jonów kadmu(II) w układzie jedno- i dwuskładnikowym. Analizowano modele izoterm adsorpcji w układzie jednoskładnikowym, m.in.: Freundlicha, Langmuira, Redlicha-Petersona, Jovanoviča, Fumkina- Fowlera-Guggenheima, Fowlera-Guggenheima-Jovanoviča-Freundlicha oraz Halseya, a także w układzie dwuskładnikowym za pomocą rozszerzonego modelu Langmuira, Langmuira- Freundlicha oraz Jaina-Snoeyinka. W testach laboratoryjnych badano równowagę oraz kinetykę adsorpcji. Adsorpcję jonów Pb(II) i Cd(II) w układzie jednoskładnikowym za pomocą FA, FA-NaOH i FA-AcNH4 dobrze opisuje model Langmuira oraz Redlicha-Petersona. Najwyższą wartość maksymalnej pojemności adsorpcyjnej uzyskano w przypadku FA-NaOH, która wynosiła 220 mg·g–1 s.m. oraz 55 mg·g–1 s.m. odpowiednio dla jonów Pb(II) i Cd(II). Badania wykazały, że FA-NaOH posiadają większą selektywność względem jonów Pb(II) niż względem jonów Cd(II), co jest związane z wielkością promienia uwodnionego jonu metalu i wartością pierwszej stałej równowagi reakcji hydrolizy. Otrzymane dane kinetyczne adsorpcji zostały dobrze wyrażone za pomocą modelu pseudo-drugiego rzędu (R2 = 0,998), natomiast wykazały bardzo słabe dopasowanie do modelu pseudo-pierwszego rzędu (R2 < 0,8). Przeanalizowano model Elovicha oraz model sorpcji wewnątrzziarnowej, który wykazał, że proces sorpcji jonów Pb(II) i Cd(II) jest kontrolowany przez dyfuzyjną warstwę graniczną oraz dyfuzję wewnątrz porów.
    The increasing demand for energy throughout the world has led to an increase in the utilization of coal and, subsequently, in the production of large quantities of fly ash as a waste product. In the light of the increasing quantity of fly ash, with a growing demand for electrical energy and hence for thermal power plants, the main challenges faced by the researchers and planners have been to solve the various environmental problems that arise due to the unused and surplus quantity of fly ash. Fly ash is composed of minerals such as quartz, mullite, subordinately hematite and magnetite, carbon, and a prevalent phase of amorphous aluminosilicate. These oxides are very effective adsorbents. Hence, fly ash can be a promising candidate material for heavy metals removal. The aim of this study was to investigate the chemical modifications of coal fly ash (FA) treated with HNO3, CH3COONH4 (AcNH4), and sodium diethyldithiocarbamate (NaDDTC) as an adsorbent for the removal of lead(II) and cadmium(II) ions in single- and bi-component system. In laboratory tests, the equilibrium and kinetic adsorption were examined. The adsorption isotherm models in single-component system were analysed, among others Freundlich, Langmuir, Redlich-Peterson, Jovanovič, Fumkin-Fowler-Guggenheim, Fowler-Guggenheim-Jovanovič-Freundlich, and Halsey, as well as in bi-component system by means of extended Langmuir, Langmuir-Freundlich, and Jain-Snoeyink models. The maximum Pb(II) and Cd(II) ions adsorption capacity obtained from the Langmuir model can be grouped in the following order: FA-NaOH > FA-AcNH4 > FA > FA-NaDDTC > FA-HNO3. Adsorption of Pb(II) and Cd(II) ions in single-component system, both the Langmuir and Redlich-Peterson models for the FA, FA-NaOH, and FA-AcNH4 could be fitted to experimental data. The maximum monolayer adsorption capacity of the FA-NaOH was found to be 220 mg·g–1 dry mass and 55 mg·g–1 dry mass for Pb(II) and Cd(II) ions respectively. Equilibrium experiments shows that the selectivity of FA-NaOH towards Pb(II) ions is greater than that of Cd(II) ions, which is related to their hydrated ionic radius and first hydrolysis equilibrium constant. The adsorption kinetics data were well fitted by a pseudo-second-order rate model (R2 = 0.998) but showed a very poor fit for the pseudo-first order model (R2 < 0.8). The Elovich and intra-particle model were analysed, also revealed that there are two separate stages in the sorption process, namely, the external diffusion and the inter-particle diffusion. It was found that the chemical enhancement of coal fly ash by NaOH treatment yields an effective and economically feasible material for the treatment of Pb(II) and Cd(II) ions-containing effluents.
    Źródło:
    Inżynieria i Ochrona Środowiska; 2016, 19, 1; 81-95
    1505-3695
    2391-7253
    Pojawia się w:
    Inżynieria i Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-38 z 38

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