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Tytuł:
Hydrocarbons removal from underground coal gasification water by organic adsorbents
Autorzy:
Lutynski, M.
Suponik, T.
Powiązania:
https://bibliotekanauki.pl/articles/110448.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
underground coal gasification
permeable reactive barrier
Langmuir adsorption isotherm
Opis:
The main problems in the case of the undergorund coal gasificiation process is the possible pollution of surrounding aquifers. The underground gasification cavity is a source of both gaseous and liquid pollutants and these are mainly aromatic hydrocarbons, phenols, heavy metals and others. In order to prevent underground water from pollution a permeable reactive barrier was proposed. The filling was granulated activated carbon and SPILL-SORB (peat) – two commonly available sorbents adequate for hydrocarbons removal. The wastewater (synthetic solution which simulated groundwater contaminated with the UCG products) was prepared by mixing distilled water with desired amounts of substances such as phenols, benzene, toluene, xylene, naphthalene etc. Batch tests were performed in order to measure sorption of phenols and benzene from the post-UCG water on the mentioned sorbents. Experimental results were fitted with linear and non-linear Freundlich and Langmuir isotherm models. The obtained data showed that removal of phenols and benzene in case of GAC was much more efficient. However, sorption was lower than in the case of literature data and can be explained by complex composition of the solution and pre-treatment of the samples. The Langmuir model gave a better fit in the case of GAC, whereas Freundlich isotherm model was matching the data better in case of SPILL-SORB.
Źródło:
Physicochemical Problems of Mineral Processing; 2014, 50, 1; 289-298
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phosphorus sorption properties of deposits from peat-muck soil profile in the Kuwasy object
Właściwości sorpcyjne w stosunku do fosforu utworów zalegających w profilu gleby torfowo-murszowej na obiekcie Kuwasy
Autorzy:
Sapek, B.
Powiązania:
https://bibliotekanauki.pl/articles/292660.pdf
Data publikacji:
2012
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
energia adsorpcji
fosfor
gleba torfowo-murszowa
izoterma adsorpcji Langmuira
pojemność adsorpcyjna
profil gleby
adsorption energy
Langmuir adsorption isotherm
peat-muck soil
phosphorus
soil profile
sorption capacity
Opis:
Sorption capacity and the energy of phosphorus adsorption on muck and peat deposits were studied in peat-muck soil profile from a lowland peatland in the Kuwasy object. Soils of the area are characterised by a laminar structure which results in variable sorption properties of peat deposits of different origin, degree of humification (decomposition - R) and transformation of organic matter of upper muck layers (degree of mucking - Z). There was a relationship between the maximum phosphorus adsorption calculated from the Langmuir isotherm (b) and adsorption energy (k) and the type and degree of humification of peat and transformation of muck mass. Muck deposits of the maximum sorption capacity similar to that of peat deposits bind phosphorus less intensively than peats. One may expect that different sorption capacity and the strength of phosphorus binding will effect in different migration of inorganic and organic P compounds in soil profile and their transfer to ground waters.
Badano pojemność adsorpcyjną i energię adsorpcji murszu oraz utworów torfowych zalegających w profilu gleby torfowo-murszowej odwodnionego torfowiska niskiego na obiekcie Kuwasy względem fosforu. Gleby tego obszaru cechują się budową warstwową, z czego wynika zmienność właściwości sorpcyjnych zalegających w nich utworów torfowych różnego pochodzenia i stopnia humifikacji (rozkładu - R) oraz przeobrażenia masy organicznej wierzchnich warstw murszu (stopnia zmurszenia - Z). Wykazano zależność obliczonych z równania izotermy adsorpcji Langmuira wartości maksymalnej adsorpcji fosforu (b) i energii adsorpcji (k) od rodzaju i stopnia humifikacji torfu zalegającego w profilu gleby oraz stopnia przeobrażenia masy murszu. Mursze o podobnej do torfów maksymalnej pojemności sorpcyjnej wiążą fosfor z mniejszą siłą niż torfy. Można przewidywać, że skutkiem różnej pojemności sorpcyjnej utworów i siły wiązania fosforu będzie zróżnicowanie migracji jego związków nieorganicznych i organicznych w profilu gleby i przenikania do wody gruntowej.
Źródło:
Journal of Water and Land Development; 2012, no. 16 [I-VI]; 61-66
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sorpcja fosforu przez mursze i utwory torfowe w rejonie doliny Biebrzy
Phosphorus srption by moorsh and peat formations in the Biebrza valley
Autorzy:
Sapek, B.
Powiązania:
https://bibliotekanauki.pl/articles/339360.pdf
Data publikacji:
2011
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
energia adsorpcji
fosfor
gleby torfowo-murszowe
izoterma adsorpcji Langmuira
pojemność adsorpcyjna
utwory organiczne
adsorption capacity
energy of adsorption
Langmuir adsorption isotherm
organic deposits
peat-muck soils
phosphorus
Opis:
Badano pojemność adsorpcyjną i energię adsorpcji murszów oraz utworów torfowych względem fosforu w profilu gleby torfowo-murszowej na tle właściwości fizykochemicznych gleb odwodnionego torfowiska niskiego w dolinie Biebrzy. Oceniono wpływ rodzaju utworu zalegającego w profilu gleby oraz jego właściwości sorpcyjne w aspekcie możliwości przenikania związków fosforu do wody gruntowej. Gleby tego obszaru cechują się budową warstwową, z czego wynika zmienność właściwości sorpcyjnych zalegających w nich utworów torfowych różnego pochodzenia i stopnia humifikacji (rozkładu - R) oraz przeobrażenia masy organicznej wierzchnich warstw murszu (stopnia zmurszenia - Z). Wykazano zależność obliczonych z równania izotermy adsorpcji Langmuira wartości maksymalnej adsorpcji fosforu (b) i energii adsorpcji (k) od rodzaju i stopnia humifikacji torfu zalegającego w profilu gleby oraz stopnia przeobrażenia masy murszu. Zależność ta nie zawsze jest prostą funkcją liniową. Mursze o podobnej do torfów maksymalnej pojemności sorpcyjnej wiążą fosfor z mniejszą siłą niż torfy. Jak można przypuszczać, skutkiem odmiennej pojemności sorpcyjnej i siły wiązania fosforu oraz zależności od wymienionych cech utworów będzie zróżnicowanie migracji jego związków nieorganicznych i organicznych w profilu gleby i przenikanie do wody gruntowej.
Adsorption capacity and adsorption energy of phosphorus in moorsh and peat deposits were investigated in the profile of peat-moorsh soil and compared with of physical and chemical properties of soils of drained lowland bog in the Biebrza valley. The effect of deposit situated in the soil profile and its sorption properties were estimated in view of a possibility of phosphorus permeation into groundwater. The soils of this area are characterised by laminar structure resulting in the instability of sorption properties of peat deposits of different origin, humification (decomposition - R) and transformation of the organic mass of surface moorsh layers (moorshing - Z). Maximum phosphorus adsorption (b) and adsorption energy (k), calculated from the Langmuir adsorption isotherm, were related to the degree of peat humification and to the transformation of moorsh mass. This relationship was not always linear. Muck formations with the maximum adsorption capacity comparable to peat bound phosphorus less intensively. As may be supposed, different sorption capacity and binding force of phosphorus will result in different migration of inorganic and organic P compounds to ground waters.
Źródło:
Woda-Środowisko-Obszary Wiejskie; 2011, 11, 3; 219-235
1642-8145
Pojawia się w:
Woda-Środowisko-Obszary Wiejskie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorption Studies of Nitrate by Geo-Physical Environment (Laterite soil) of the Study Area Bidar Urban & its Industrial Area, Karnataka State, India
Autorzy:
Shivasharanappa, ---
Padaki, S.
Kushtagi, S.
Powiązania:
https://bibliotekanauki.pl/articles/971327.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Nitrate Adsorption
laterite
Batch Experiments
Freundlich isotherm
Langmuir isotherm
Opis:
In the present work, adsorption of Nitrate on Laterite soil has been studied using batch adsorption techniques. Main objectives of this study is to study the physical properties of Laterite soil, detection of Nitrate removal by adsorbent Laterite soil as a function of contact time, adsorbent dosage, pH, to study sorption kinetics, and to study isothermal pattern. The results of this study showed that the Optimum contact time, Optimum dosage and Optimum pH for adsorption of Nitrate on Laterite soil reached to equilibrium after 130 minutes, with removal efficiency of 68 %, 1400 mg as optimum dosage and at optimum pH of 6. The rate of adsorption of Nitrate obeys first order rate equation. The obtained results of the batch experiments are best fitted to Langmuir and Freundlich adsorption isotherms. From the experimental analysis it is concluded that Laterite soil shows good removal efficiency and hence can be used as adsorbent.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 6; 66-76
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermodynamics and adsorption studies of dye (rhodamine-b) onto natural diatomite
Autorzy:
Koyuncu, M.
Kul, A. R.
Powiązania:
https://bibliotekanauki.pl/articles/110287.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
diatomite
rhodamine B
adsorption
thermodynamics
Langmuir isotherm
Freundlich isotherm
Opis:
Thermodynamics and adsorption studies were conducted with a dye of rhodamine-B on natural diatomite. Adsorption of the dye was investigated with an initial dye concentration at pH 8±0.2, 303, 313 and 323 K. The adsorption experiments were carried out isothermally at three different temperatures. The Langmuir and Freundlich isotherm models were used to describe the equilibrium data and the results were discussed in details. The kinetic data agreed with the pseudo-first order model with rate constants (k2) in the range of 3.05–1.59.10–1 g/mg min. The thermodynamic parameters such as standard free energy, entropy change and enthalpy were calculated for natural diatomite. These values showed that adsorption of rhodamine-B on natural diatomite was a spontaneous and endothermic process.
Źródło:
Physicochemical Problems of Mineral Processing; 2014, 50, 2; 631-643
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Removal of Heavy Metal by Ion Exchange Using Bentonite Clay
Autorzy:
Hussain, Shaymaa Talib
Ali, Seroor Atalah Khaleefa
Powiązania:
https://bibliotekanauki.pl/articles/1839579.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
bentonite
lead ion
copper ion
adsorption
wastewater
Freundlich isotherm
Langmuir isotherm
Opis:
Bentonite clay was utilized in this research as adsorbent element to remove the lead and copper ions from wastewater. Series of tests were performed at multiple parameters, such as pH solution, initial concentration of lead and copper ions, adsorbent mass, and contact time. The greatest removal was attained at pH 5, adsorbent weight of 0.5 g, initial heavy metal concentration of 10 mg/l, and a contact time of 60 minutes. The results revealed that bentonite clay is suitable in the removal of metal ions from polluted water. The ion exchange rate of lead was faster than that of copper. The isotherm for the adsorption of the lead and copper ions on bentonite clay was confirmed by the Freundlich and Langmuir isotherms which offered good consequences. The results indicated that bentonite was utilized as an efficient ion exchange element for the removal of heavy metal ions from polluted water. Fourier Transformed Infrared Spectrophotometer (FTIR) images of bentonite clay before and after adsorption showed the imbibition of metal ions by bentonite clay.
Źródło:
Journal of Ecological Engineering; 2021, 22, 1; 104-111
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorpcja ołowiu na modyfikowanym węglu aktywnym ROW 08 Supra
Adsorption of Lead on ROW 08 Supra Modified Activated Carbon
Autorzy:
Lach, J.
Okoniewska, E.
Ociepa-Kubicka, A.
Szymonik, A.
Powiązania:
https://bibliotekanauki.pl/articles/1818532.pdf
Data publikacji:
2015
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
adsorpcja
ołów
izoterma Langmuira
adsorption
lead
Langmuir isotherm
Opis:
The presented work is aimed at comparing two types of gaseous modification: conventional with the use of external source of energy (heat) and originally developed method with Joule heat generated during the flow of electrical current through a carbon bed. Conventional modification of ROW 08 Supra activated carbon was conducted in a rotary furnace in the atmosphere of (1) steam and carbon dioxide at temperature of 400 and 800°C and (2) air at the temperature of 400°C. The modification of activated carbon in the electric heating experimental system (referred to as SEOW) occurred in the process of heating of activated carbon during the flow of electric current through the carbon bed up to 400°C, followed by cooling down with the air or carbon dioxide. Both methods for modification of activated carbons allowed for increasing adsorption capacity towards ions Pb(II). The advantage of heating the activated carbon with the electric heating experimental system (SEOW) required far less energy than in case of conventional method (up to many fold). In case of modified carbon ROW 08 Supra, the increased adsorption efficiency was obtained for coals modified at 800°C and the carbon modified at 400°C with the participation of water vapor. As a result of modification of the SEOW carbons for all analyzed activated carbons, the adsorption percentage increased. Among all the modified activated carbon, the highest adsorption capacity has been given to carbon modified to SEOW through heating it to 400°C and air cooling as well. The results are described by the means of Freundlich and Langmuir isotherm. In order to determine the coefficients of Langmuir isotherm, five different rectilinear forms were used. Among the analyzed issues the best fit to the experimental results obtained for the I Langmuir isotherms (the highest values of the coefficients R2). The impact of pH and temperature on the effectiveness within the adsorption solution of Pb (II) was also analyzed. The most effective adsorption of lead from solutions of pH 2, 4, and 6 occurred at the highest pH, but the differences between the adsorption solution at pH 6 and pH 8 has been low. Within the adsorption from solutions having a pH of 2 a very little adsorption of lead was observed. Furthermore the size of adsorption of solutions at 20, 30 and 40°C was analyzed as well. What has been found is that through increasing the temperature the efficiency of the adsorption process within Pb (II) is raised.
Źródło:
Rocznik Ochrona Środowiska; 2015, Tom 17, cz. 1; 692-709
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Removal of Cr(VI) using a novel adsorbent modification. Ultrasonic method with apricot kernel shells
Autorzy:
Kalipci, E.
Namal, O. O.
Powiązania:
https://bibliotekanauki.pl/articles/207440.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
adsorption
isotherms
ultrasonics
Langmuir adsorption
Langmuir isotherm
adsorpcja
izotermy
ultradźwięki
adsorpcja Langmuira
izoterma Langmuira
Opis:
Raw apricot kernel shells (AKS) and ultrasound-modified apricot kernel shells were used as adsorbents for the removal of Cr(VI) from aqueous solutions. For raw and modified AKS, the experimental data well fitted to the Langmuir isotherm and adsorption kinetics was suited to pseudo-second order kinetic model indicating chemisorption as the rate-limiting step. For raw and modified AKS, maximum adsorption capacities obtained from the Langmuir adsorption model were 6.5 mg/g and 9.9 mg/g, respectively. Maximum Cr(VI) adsorption was obtained at a pH 2 and optimum stirring speed was determined as 250 rpm. After ultrasound modification, an increase for Cr(VI) adsorption was observed. Raw AKS as low-cost natural biomaterial can be preferred for the removal of Cr(VI) when compared to other adsorbents. Ultrasonic modification can be used to improve the efficiency of Cr(VI) removal.
Źródło:
Environment Protection Engineering; 2018, 44, 3; 79-93
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ferric hydroxide-based media for removal of toxic arsenic species. Kinetic, equilibrium and thermodynamic studies
Autorzy:
Szlachta, M.
Wójtowicz, P.
Powiązania:
https://bibliotekanauki.pl/articles/207931.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Freundlich isotherm
Langmuir isotherm
arsenic
adsorption
sewage
izoterma Freundlicha
izoterma Langmuira
arsen
adsorpcja
ścieki
Opis:
Adsorption studies were conducted to assess the feasibility of ferric hydroxide-based material for treatment of highly arsenic-contaminated effluents. The experiments were performed in a batch adsorption regime using a synthetic aqueous solution. The contact time between arsenic ions and the adsorbent, initial concentration of arsenic in treated solution, temperature of solution and adsorbent dose had a significant effect on the adsorption performance in the system. Both the mechanism of the process involved and the rate of As(III) and As(V) adsorption were analyzed based on pseudo-firstand pseudo-second order kinetic models. The adsorption data at constant temperature were described by the Langmuir and Freundlich isotherm equation, and the theoretical adsorption capacity of ferric hydroxide was determined to be 43.75 mg/g and 44.04 mg/g for arsenic(III) and (V), respectively. The estimated thermodynamic parameters, including changes in free energy, enthalpy and entropy, revealed that the adsorption is spontaneous and endothermic under applied experimental conditions.
Źródło:
Environment Protection Engineering; 2018, 44, 4; 117-129
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phosphorus sorption capacity of different types of opoka
Zdolnosc wchlaniania fosforu przez rozne rodzaje opoki
Autorzy:
Cucarella, V.
Zaleski, T.
Mazurek, R.
Powiązania:
https://bibliotekanauki.pl/articles/81895.pdf
Data publikacji:
2007
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
calcium
Freundlich adsorption model
Freundlich isotherm
langmuir isotherm
opoka
phosphorus removal
silica
sorption
phosphorus sorption
Opis:
The bedrock opoka has been lately reported as an appropriate reactive media for onsite wastewater treatment systems due to its high phosphorus (P) sorption capacity. However, variations on its chemical composition may affect its reactivity with P, therefore leading to a variable P removal effi ciency. In this paper, the P-sorption capacity of three different types of opoka from the region of Miechów, Poland, is reported. According to the silica and carbonate content, opoka samples were classifi ed as light--weight and heavy-weight opoka. When heated over 900°C, opoka showed a very high P-sorption capacity that was well correlated to its Ca content. P-sorption isotherms from batch experiments with an artifi cial P solution were plotted and fi tted to the Langmuir and Freundlich adsorption models. The Freundlich isotherm appeared to model better the P-sorption of light opoka and the Langmuir isotherm of heavy opoka, suggesting different dominating mechanisms of P-sorption by light and heavy opoka.
Według ostatnich badań opoka jest uważana za sorbent, który ze względu na wysoką zdolność wiązania fosforu, może mieć zastosowanie w przydomowych oczyszczalniach ścieków. Jednakże różnorodność składu chemicznego opoki wpływa na intensywność wiązania P i prowadzi do różnej efektywności procesu oczyszczania ścieków. W pracy przedstawiono zdolność wiązania P przez trzy rodzaje opok pobranych w rejonie Miechowa (woj. małopolskie). Na podstawie zawartości krzemionki i węglanów próbki zostały podzielone na opokę lekką i ciężką. Po wypaleniu w temperaturze ponad 900°C opoka charakteryzowała się bardzo wysoką zdolnością wiązania P, silnie skorelowaną z zawartością Ca. Krzywe sorpcji P, otrzymane podczas doświadczenia ze sztucznie sporządzonym roztworem zawierającym rozpuszczony P, porównano z modelami absorpcji opracowanymi przez Langmuira i Freundlicha. Izoterma Freundlicha była bardziej zbliżona do krzywej wiązania P przez opokę lekką, z kolei model Langmuira okazał się bliższy krzywej sorpcji opoki ciężkiej.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation; 2007, 38; 11-18
0208-5771
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorption of sodium/calcium poly(acrylic acid) salts on anatase: effect of the polyelectrolyte molecular weight and neutralization
Autorzy:
Jacquemet, Christian
Powiązania:
https://bibliotekanauki.pl/articles/1449765.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
adsorption
free energy
Langmuir isotherm
sodium-calcium poly(acrylic acid) salts
anatase
Opis:
Abstract: Interactions of poly(acrylic acid)s (PAAs) of two different molecular weights (Mw = 9,560 g×$mol^{-1}$ and 4,220 g×$mol^{-1}$) with surfaces of an untreated anatase $TiO_2$ were assessed through adsorption isotherm measurements. Those dispersants were tested under different sodium-calcium neutralization states (molar ratio $r = Ca^{2+}$ / $CO_{2-}$ varying from 0 to 0.35). Their behavior towards the $TiO_2$ surfaces can be described by the Langmuir adsorption model. For both polymers, surface coverage ($Γ_max$) evolves linearly with the molar ratio $r$. For a given r value, a lower surface coverage was observed with the polymer having the highest molecular weight. The free energy of adsorption ($/DeltaG_{ads}$) of PAAs was estimated from adsorption experiment data. This calculation indicates that sorption occurs spontaneously and is unlikely to be of chemical nature. The absolute values of $/DeltaG_{ads}$ are higher for the highest molecular weight polymers suggesting that they are more strongly adsorbed to anatase surfaces. The absolute values of $/DeltaG_{ads}$ per mole of sodium-calcium macromolecules are found to be lower than those calculated for their homologues 100% sodium neutralized suggesting that they are bound with the solid by a fewer number of segments.
Źródło:
Physicochemical Problems of Mineral Processing; 2020, 56, 1; 113-123
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface modification of fly ash spheroidal particles and their application in the adsorption of phosphorus and chromium(VI) from single and competitive solute systems
Autorzy:
Chen, Chen
Cheng, Ting
Zhang, Xiao
Zhang, Minte
Lv, Ruiyang
Powiązania:
https://bibliotekanauki.pl/articles/2032957.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
fly ash
Langmuir isotherm
adsorption phosphorus
popiół lotny
izoterma Langmuira
adsorpcja fosforu
Opis:
This work focuses on the surface modification of fly ash spheroidal particles and their application in phosphorus and chromium(VI) adsorption. The results show that through surface modification, amorphous silica-alumina gels precipitated on the spheroidal particle surface (by which the microsurface area of the reaction products is effectively enlarged) and the surface zeta potential was changed to fit for adsorbing anions. During the adsorption experiment (single and competitive solute systems), chromium(VI) was easier to adsorb. The surface zeta potential and the existence of competitive ions should be recognized as two important factors affecting adsorption efficiency. A higher temperature could improve the adsorption efficiencies of the two solute systems. The fitting results of the pseudo-second-order model (single and competitive solute systems) show better agreement than those of the pseudo-first-order model at every temperature. The Langmuir adsorption isotherm equation can better simulate the adsorption process in single solute sy039stems, but only the chromium(VI) adsorption process can be fitted by the competitive Langmuir adsorption isotherm in competitive solute systems.
Źródło:
Environment Protection Engineering; 2020, 46, 3; 39-59
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dry Biosolids Reuse as Costless Biodegradable Adsorbent for Cadmium Removal from Water Systems
Autorzy:
Ammari, Tarek G.
Al-Hadidi, Majida
Al-Kharabsheh, Noor
Khater, Dima
Abu-Romman, Saeid
Powiązania:
https://bibliotekanauki.pl/articles/1838412.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
adsorption
Cd-contaminated environment
untreated biosolids
intraparticle difusion model
Langmuir isotherm model
Opis:
The recycling of untreated dry biosolids, as costless biodegradable adsorbent for the removal of cadmium from aqueous phase was characterized. The adsorption of cadmium was reported to depend on initial pH, adsorbent dose, agitation time, and initial Cd concentration. The results of the batch experiments revealed that the maximum adsorption capacity of the untreated dry biosolids was 39.22 mg g-1 under optimum operating conditions (i.e. pH: 5, adsorbent dose: 2 g l-1, contact time: 16h). Adsorption reaches equilibrium after 16h, which can be attributed to both external surface adsorption (R2 = 0.86) and intraparticle dif usion (R2 = 0.98). The Langmuir isotherm model best described cadmium adsorption (R2 = 0.99) and the pseudo-second-order kinetic model was obeyed, suggesting that the mechanism involved was chemisorption. Biodegradability would make the recovery of adsorbed Cd an environmentally friendly process. Comparing the obtained findings with the related published results, it can be concluded that treating biosolids might be an unnecessary and costly procedure for recycling biosolids as an adsorbent for cadmium.
Źródło:
Journal of Ecological Engineering; 2021, 22, 5; 1-12
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorption of reactive dyes and their mixtures on activated carbon. Kinetics, equilibrium and thermodynamic evaluation
Autorzy:
Kouhail, Meriem
Elahmadi, Zakia
Benayada, Abbes
Dewil, Raf
Powiązania:
https://bibliotekanauki.pl/articles/206912.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
adsorption efficiency
adsorption kinetics
Langmuir isotherm
reactive dye
COD
efektywność adsorpcji
kinetyka adsorpcji
izoterma Langmuira
barwnik reaktywny
ChZT
Opis:
The adsorption of three reactive dyes (Reactive Bezactiv Yellow (RBY), Reactive Bezactiv Blue (RBB) and Reactive Bezactiv (RBR)) on a commercially available activated carbon (CAC) has been evaluated. It was shown that CAC is capable to effectively remove these dyes from a solution. The adsorption increased with higher contact time, adsorbent dose, and initial dye concentration. The data indicated that the adsorption kinetics of dyes on CAC followed a pseudo-second order model. The adsorption isotherms followed the Langmuir isotherm model. Evaluation of thermodynamic parameters revealed that the adsorption process is endothermic for all dyes and spontaneous in a single system and became spontaneous in mixture systems at high temperature, expect RBY and RBB in the ternary mixture. Adsorption was higher for RBY, followed by RBB, and was lowest for RBR. The total adsorption efficiency was confirmed by chemical oxygen demand (COD) measurements.
Źródło:
Environment Protection Engineering; 2020, 46, 2; 5-24
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Activated bio-carbons prepared by physical activation of residues after supercritical extractionof raw plants
Autorzy:
Bazan-Woźniak, Aleksandra
Pietrzak, Robert
Powiązania:
https://bibliotekanauki.pl/articles/110368.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
bio-sorbents
physical activation
toxic gas removal
adsorption from liquid phase
Langmuir and Freundlich isotherm
Opis:
A series of activated bio-carbons has been obtained by physical activation of residues after supercritical extraction of blackberries, raspberries and blackcurrants. The effects of different temperatures of activation and different starting materials on the physicochemical and sorption properties of the bio-carbon samples obtained were evaluated. The physicochemical properties of the activated bio-carbons were characterized by elementary analysis, low-temperature nitrogen sorption and Boehm titration. All materials were tested as adsorbents of pollutants from gas (nitrogen dioxide) and liquid (iodine, methylene blue) phase. The sorption properties of the activated bio-carbons were tested at 23°C. The materials obtained were activated bio-carbons of surface area ranging between 303 and 442 m2/g and showing basic character of the surface. The content of elemental carbon in the obtained samples was in the range of 73.4-82.1 wt. %. The maximum adsorption capacities of the materials towards nitrogen dioxide were 65 mg/g, methylene blue -207 mg/g, and iodine 1001 mg/g. According to the adsorption tests towards nitrogen dioxide, the sorption capacities of the adsorbents studied were increased if a mixture of nitrogen dioxide and air had a humidity of 70 %. The mechanism of methylene blue adsorption involved the formation of adsorptive multilayer. The most effective adsorbent of organic and inorganic pollutants proved to be the activated bio-carbon obtained from the residues after supercritical extraction of blackcurrants.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 6; 1357-1365
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
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