Temat: copper adsorption - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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

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Skocz do pozycji: 2.

Tytuł:: Biosorption of Cu2+ and Ni2+ ions from aqueous solutions using waste dried activated sludge biomass
Autorzy:: Aslan, S.
Yildiz, S.
Ozturk, M.
Powiązania:: https://bibliotekanauki.pl/articles/777992.pdf
Data publikacji:: 2018
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: adsorption
copper
nickel
waste biomass
Opis:: Adsorption of Cu(II) and Ni(II) ions onto the waste powdered activated sludge biomass (PWB), which was obtained from the biological wastewater treatment plant, was investigated in this experimental study. The effects of contact time, pH, temperature, initial sorbate and sorbent concentrations on the adsorption were determined. The BET surface area, pore volume, and pore diameter of PWB were found to be about 0.51 m²/g, 0.0053 cm³/g, and 41.4 nm, respectively. Considering the R² value, q_exp and q_cal , the Langmuir and Freundlich models were well described for Cu(II) and Ni(II) adsorption, respectively. The adsorption mechanism of Cu(II) and Ni(II) onto the PWB could be better simulated by the pseudo-second-order kinetic mechanism than the pseudo-first-order, intra particle diffusion and Elovich models. Thermodynamic aspects of the adsorption of heavy metals were also investigated. Considering the applied desorbing agents for reuse of PWB for Ni(II) recovery, desorption cycle is not feasible due to the deterioration of the PWB structure.
Źródło:: Polish Journal of Chemical Technology; 2018, 20, 3; 20-28
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Kinetics and isotherm modelling of Zn(II) ions adsorption onto mine soils
Autorzy:: Jalayeri, H.
Salarirad, M. M.
Ziaii, M.
Powiązania:: https://bibliotekanauki.pl/articles/110575.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: copper mine soil
Zn(II)
adsorption kinetic
adsorption isotherms
Opis:: The soils consist of various components that can play a significant role in control of heavy metals in the environment. Therefore, understanding of adsorption properties of soil is essential in solving pollution problems around mine sites. The goal of this paper is to study Zn(II) ions adsorption onto copper mine soil. Soils were examined via X-ray diffraction and scanning electron microscopy. The influence of various parameters such as effect of pH, adsorbent dose, and initial concentration of Zn(II) ions on adsorption was evaluated by batch method. The adsorption isotherms of Zn(II) ions such as Langmuir, Freundlich, and Temkin were studied. The Langmuir isotherm indicated an excellent fit for the experimental data in comparison with other isotherms that shown monolayer adsorption onto a homogenous surface. A number of kinetic models were tested to fit the kinetic data. The results show that soils can be more effective in decreasing heavy metals contamination specially Zn(II) ions from solution phase.
Źródło:: Physicochemical Problems of Mineral Processing; 2016, 52, 2; 767-779
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

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

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Skocz do pozycji: 5.

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

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Skocz do pozycji: 6.

Tytuł:: Treatment of Copper-Contained Jewellery Wastewater by Precipitation and Adsorption Using Rice Husk Charcoal
Autorzy:: Tuas, Maria A.
Masduqi, Ali
Powiązania:: https://bibliotekanauki.pl/articles/125212.pdf
Data publikacji:: 2019
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: adsorption
copper
jewelry industry
rice husk charcoal
Opis:: The wastewater from the jewellery industry generally contains a large amount of metal. Metal removal can be done with many techniques, including precipitation and adsorption. Precipitation is done to convert the metal content from the dissolved phase to a solid that is easily precipitated. Generally, precipitation is unable to separate one hundred percent of metal content, so further processing is needed, i.e. adsorption. This research was done by using rice husk which is an agricultural waste in Indonesia. The rice husk is burnt to charcoal, then activated with acid. A SEM-EDX analysis was conducted to obtain a surface description of rice husk charcoal before and after use in the adsorption process. The results showed that the copper content in the jewellery wastewater can be adsorbed with a 40-50 mesh rice husk charcoal and the adsorption process follows the Freundlich isotherm model with R2 value of 0.9625.
Źródło:: Journal of Ecological Engineering; 2019, 20, 4; 94-103
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Adsorption and inhibitive properties of methanol extract of Eeuphorbia Heterophylla for the corrosion of copper in 0.5 M nitric acid solutions
Autorzy:: Fouda, A. S.
Elmorsi, M. A.
Abou-Elmagd, B. S.
Powiązania:: https://bibliotekanauki.pl/articles/780024.pdf
Data publikacji:: 2017
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: acid corrosion
copper
green inhibitor
adsorption
kinetic parameters
Opis:: The adsorption and the inhibitive properties of methanol extract of Euphorbia heterophylla on copper in 0.5 M HNO₃ have been studied by weight loss method at different temperatures (30-50°C), potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. Also, the surface morphology was analyzed by scanning electron microscopy (SEM). It was found that the inhibition efficiency increases with increasing extract doses and decreased with increasing temperature. The polarization data revealed that this extract acts as mixed type inhibitor. The adsorption process was more favored at lower temperatures with larger negative standard free energy. The extract was adsorbed physically on the copper surface followed Frumkin isotherm.
Źródło:: Polish Journal of Chemical Technology; 2017, 19, 1; 95-103
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Adsorption Capacity of Maize Biomass Parts in the Remediation of Cu2+ Ion Polluted Water
Autorzy:: Duru, Chidi Edbert
Duru, Ijeoma Akunna
Powiązania:: https://bibliotekanauki.pl/articles/1113924.pdf
Data publikacji:: 2017
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Adsorption capacity
Copper
Maize husk
Remediation
Removal efficiency
Opis:: We investigated the efficiency of maize biomass parts - seed chaff, stalk, cob and husk, in the remediation of Cu2+ ion polluted water in modeled solutions. The adsorption capacity of these parts followed the order of husk > stalk > cob > seed chaff, with values of 9.65 mg/g, 4.83 mg/g, 3.70 mg/g and 2.48 mg/g, respectively. Maximum adsorption capacity of each part was reached in 45 min. Herein, the husk giving the best removal efficiency of 80.80%. Characterization of the maize husk using PIXE showed that potassium is the main cation on this biomass, with concentration 5.602 g/kg. FTIR scans of the husk before and after adsorption of Cu2+ ions gave shifts in adsorption bands on -OH carrying molecules, indicating that complexation is a mechanism in the metal ion removal process. The multi porous structure of the husk, and uniform surface coverage by ions observed from SEM images before and after adsorption, shed more light on the high adsorption efficiency shown by this natural waste material.
Źródło:: World News of Natural Sciences; 2017, 12; 51-62
2543-5426
Pojawia się w:: World News of Natural Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Copper (II) Oxide particles as Adsorbent for Removal of Alkali Blue; Isotherm and Kinetic Studies
Autorzy:: Ibrahim, M. A.
Ibrahim, M. B.
Powiązania:: https://bibliotekanauki.pl/articles/1158766.pdf
Data publikacji:: 2018
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Adsorption
Copper (II) Oxide particles
FTIR
Isotherm
Kinetics
Opis:: Adsorption behaviour of copper (II) oxide particles (CuO-Ps) for the removal of Alkali Blue (AB) was studied. Different adsorption variables such as contact time, initial concentration and pH for the adsorption process were investigated by batch adsorption studies. FTIR was carried out to determine the functional groups present at the surface of the particle with functional groups such as –OH, C=C, C-H, C≡C detected. The percentage removal and optimum contact time for the removal of AB was 84.8% at 10 min. The experimental isotherms data were analyzed using Langmuir, Temkin, Freundlich and Dubinin-Radushkevich (D-R) isotherms and it was observed that AB fits closely to Langmuir with R2 value of 0.884. Kinetics studies shows that the adsorption process fits better to pseudo-second order with the experimental values of qe 4.242 been closer to the calculated values of the qe 4.108. Effect of pH shows that it adsorb better at the initial pH of 5.30. Lower value of mean square energy of 0.707 kJ/mol indicates that the adsorption process is physical. The results indicated that copper (II) oxide particle can be used as a low-cost adsorbent for the removal of AB from aqueous solutions.
Źródło:: World Scientific News; 2018, 114; 208-217
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Modyfikowany napełniacz polimerów jako efektywny adsorbent jonów Cu(II) z roztworu wodnego
Modified polymers filler as an effective adsorbent of Cu(II) ions from an aqueous solution
Autorzy:: Wierzbicka, Ewa
Legocka, Izabella
Kuśmierek, Krzysztof
Świątkowski, Andrzej
Powiązania:: https://bibliotekanauki.pl/articles/1789964.pdf
Data publikacji:: 2021
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:: haloizyt
jony miedzi
adsorpcja
haloysite
copper ions
adsorption
Opis:: Haloizyt modyfikowany organicznymi związkami zawierającymi azot, wykorzystywany jako napełniacz polimerów, zastosowano do adsorpcji jonów Cu(II) z roztworu wodnego. Stwierdzono korelację ilości zaadsorbowanych jonów miedzi i ilości azotu związanego z powierzchnią haloizytu. Zwiększenie zawartości azotu na powierzchni haloizytu powodowało istotne zwiększenie zdolności adsorpcyjnej materiału w odniesieniu do jonów Cu(II).
The halloysite modified with nitrogen-containing organic compounds (used as a polymers filler) was used to adsorb Cu(II) ions from an aqueous solution. A correlation was found between the amount of adsorbed copper ions and the amount of nitrogen bound to the halloysite surface. Increasing of the nitrogen content significantly increased the adsorption capacity of the material in relation to Cu(II).
Źródło:: Polimery; 2021, 66, 4; 253--258
0032-2725
Pojawia się w:: Polimery
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Modification of Natural Clays for Use in the Processes of Sewage Treatment
Autorzy:: Pimneva, Lyudmila A.
Zagorskaya, Alla A.
Powiązania:: https://bibliotekanauki.pl/articles/124409.pdf
Data publikacji:: 2019
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: efficient waste treatment
clay adsobent
copper ions
adsorption isotherms
Opis:: The paper deals with the modification of clay sorbents in order to improve the efficiency of of copper ions extraction from wastewater. The study examined the elemental, mineralogical and phase composition of kaolin and montmorillonite clays. The authors analyzed the sorption capacity of natural sorbents under static conditions before and after modification with hydrochloric acid, sodium chloride and sodium hydroxide. The work also determines the change in the physical and chemical properties of the sorbent after modification. The most optimal modification conditions for the purification of wastewater from copper ions are distinguished.
Źródło:: Journal of Ecological Engineering; 2019, 20, 8; 12-17
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Effect of silver, nickel and copper cyanides on gold adsorption on activated carbon in cyanide leach solutions
Autorzy:: Sayiner, B.
Acarkan, N.
Powiązania:: https://bibliotekanauki.pl/articles/109675.pdf
Data publikacji:: 2014
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: gold
silver
nickel
copper
cyanide leaching
activated carbon adsorption
Opis:: The effect of Ag, Ni and Cu cyanides on gold adsorption on activated coconut carbon in cyanide leach solutions was investigated by synthetic cyanide leach solutions containing gold and other metal cyanides. According to the adsorption tests Ag remarkably reduces the gold adsorption on activated carbon by competing with gold to adsorption sites. When the Ag concentration in solution increases up to 200 ppm the carbon adsorption method for gold recovery becomes inapplicable. Ni has an effect on gold adsorption on activated carbon, however even at as high concentrations of Ni as 250 ppm residual Au in solution is still below 1 ppm. Cu addition up to 300 ppm does not affect the gold loading significantly. According to the adsorption test studies, it is concluded that the metal-cyanides diminish the gold adsorption on activated carbon by adsorbing themselves and competing with gold. When the metals are present in the leach solution all together with gold, they also prevent adsorption of themselves as well as gold. Thus, when Au, Ag, Ni and Cu are present in solution simultaneously, the adsorption of all these metals decreases. The adsorption results were modeled by Fleming k,n adsorption kinetic model.
Źródło:: Physicochemical Problems of Mineral Processing; 2014, 50, 1; 277-287
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Durability of chitosan/cellulose hydrogel beads regenerated from an ionic liquid in acidic and basic media and their metal adsorptive characteristics
Autorzy:: Matsumoto, Michiaki
Ishikawa, Sayumi
Kamigaki, Tatsuya
Powiązania:: https://bibliotekanauki.pl/articles/1034207.pdf
Data publikacji:: 2019
Wydawca:: Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:: Chitin
Emim
adsorption
cellulose
copper
ionic liquid
nickel
zinc
Opis:: Chitosan–cellulose gel beads were regenerated from an ionic liquid, and their application to a metal adsorbent was examined. The chitosan–cellulose gel beads, which were prepared from 1-ethyl-3-methyl imidazolium acetate, were more stable in the acidic and basic aqueous solutions than cellulose or chitosan. The adsorption of copper on chitosan–cellulose gel beads was examined, and the adsorption amount of copper ion increased with pH, suggesting that amino groups on chitosan were related to adsorption. The adsorption isotherm of copper, zinc, and nickel ions was well described by the Langmuir model, and the adsorption ability of these metal ions obeyed the Irving-Williams series. Fe3+, Mn2+, and Co2+ from a buffer solution and Pt4+, Au3+, and Pd2+ from a hydrochloric acid solution were not adsorbed on the chitosan–cellulose gel beads.
Źródło:: Progress on Chemistry and Application of Chitin and its Derivatives; 2019, 24; 145-150
1896-5644
Pojawia się w:: Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Metallurgical evaluation of copper ore flotation performance in the presence of Rhamnolipid biosurfactant produced from Pseudomonas aeruginosa. Part 1: Copper-bearing minerals
Autorzy:: Biniaz, Gholamreza
Khoshdast, Hamid
Garmsiri, Mohammad Reza
Maleki-Moghaddam, Mostafa
Hassanzadeh, Ahmad
Powiązania:: https://bibliotekanauki.pl/articles/29552037.pdf
Data publikacji:: 2023
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: copper ore
bioflotation
rhamnolipid biosurfactant
metallurgical response
surface adsorption
Opis:: The present research work studies the effect of rhamnolipid biosurfactant (RL) produced from Pseudomonas aeruginosa bacteria on the metallurgical response of a copper ore sample flotation through an extensive full factorial experimental design. Key influential factors including feed particle size, pulp solid content, pH, and dosages of collector, frother and RL biosurfactant were considered. The surface activity of the RL biosurfactant was also studied based on a D-optimal experimental design. Surface activity results revealed that increasing pH and electrolyte concentrations negatively impacted the RL surface activity, while the effect of electrolyte source was dependent on their ionic strength. Metallurgical investigations showed that operating parameters significantly influence the copper grade and recovery with considerable interaction among various parameters. RL biosurfactant was found to negatively decrease the copper grade (~0.5%) and positively enhance the recovery (~3%). Effect of RL was attributed to two potential mechanisms, i.e., being ineffective on copper minerals and/or interaction with gangue minerals, as well as increasing the rate of entrainment due to high foamability, both of which increased non-selective recovery of gangue minerals. Interestingly, regardless of the structural similarities, no interaction between the flotation reagents and rhamnolipid was observed. Fourier-transform infrared (FTIR) spectroscopic analysis of copper minerals, both pure and RL-exposed, showed that there was actually no molecular interaction between RL molecules and particle surface.
Źródło:: Physicochemical Problems of Mineral Processing; 2023, 59, 5; art. no. 183176
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Adsorpcja miedzi(II) i cynku(II) na modyfikowanej korze wierzby Salix americana
Adsorption of copper(II) and zinc(II) ions on modified Salix americana wicker bark
Autorzy:: Rypińska, I.
Biegańska, M.
Powiązania:: https://bibliotekanauki.pl/articles/125857.pdf
Data publikacji:: 2013
Wydawca:: Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:: adsorpcja
kora wierzby
miedź
cynk
adsorption
willow bark
copper
zinc
Opis:: Kora wierzby Salix americana stanowi odpad powstający w procesie korowania (uszlachetniania) wikliny, który do tej pory nie znalazł praktycznego zastosowania. Kora może adsorbować jony metali, ponieważ w swym składzie ma ugrupowania fenolowe zdolne do wymiany jonów. Ponadto zawiera barwniki, garbniki oraz ok. 20-45% ligniny i 10-35% celulozy i hemiceluloz, które również mogą brać udział w usuwaniu jonów metali z roztworów. Substancje te oraz ich pochodne mają dobre właściwości adsorpcyjne. W celu zwiększenia wydajności procesu adsorpcji prowadzi się modyfikację kory, m.in. kwasem azotowym. W pracy przedstawiono wyniki sorpcji jonów miedzi(II) i cynku(II) na zmodyfikowanej korze wierzby plecionkarskiej Salix americana. Kora modyfikowana była kwasem azotowym o stężeniach od 5 do 15%. Najlepsze rezultaty adsorpcji uzyskano, wykorzystując do modyfikacji 15% kwas azotowy. Przy czym czas modyfikacji w przypadku adsorpcji jonów Zn(II) wynosił 40 min, natomiast w przypadku jonów Cu(II) najlepsze rezultaty uzyskano po 120 min prowadzenia procesu. Wzrost wyjściowego stężenia miedzi(II) i cynku(II) powodował wzrost ich adsorpcji na zmodyfikowanej korze przy jednoczesnym zmniejszeniu stopnia usuwania Cu(II) i Zn(II). Strukturę powierzchniowych grup kory wierzby plecionkarskiej S. americana zbadano w podczerwieni przy użyciu spektroskopu z transformatą Fouriera metodą osłabionego całkowitego odbicia (FT-IR, ang. Fourier Transform Infrared spectroscopy).
Salix americana willow bark is a waste arising in the process of wicker decortication (operations) that so far has not found any practical application. The bark can adsorb metal ions as present in its composition phenolic groups are able to exchange ions. It also contains pigments, tannins and about 20-45% and 10-35% lignin, cellulose and hemicelluloses, which may also be involved in the removal of metal ions from solutions. These substances and their derivatives are known for good adsorption properties. To increase the efficiency of the adsorption by modification processes of the cortex with nitric acid were conducted. The results of sorption of copper(II) and zinc(II) on modified willow bark of Salix Americana were presented. The bark has been modified with nitric acid at concentrations ranging from 5 to 15%. Very good results of adsorption of the studied metal ions were observed for modification with 15% HNO3. The optimum time of modification in the case of adsorption of Zn(II) was 40 min, whereas in the case of Cu(II) the best results were obtained after 120 min of the process. The increase of initial concentration of copper(II) and zinc(II) caused an increase in their amount of adsorption on modified willow bark while reducing the degree of removal of the ions.
Źródło:: Proceedings of ECOpole; 2013, 7, 2; 703-711
1898-617X
2084-4557
Pojawia się w:: Proceedings of ECOpole
Dostawca treści:: Biblioteka Nauki

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