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A platform for research: civil engineering, architecture and urbanism
Inorganically modified clay minerals: Preparation, characterization, and arsenic adsorption in contaminated water and soil
https://orcid.org/0000-0002-4196-1225
AbstractThe use of modified clay minerals for adsorbing arsenic (As) in contaminated soils is an underexplored area of research. The adsorption behavior of As onto inorganically modified smectite and kaolinite both in aqueous and soil media was studied. X-ray diffraction, infra-red spectroscopy, scanning and transmission electron microscopy studies confirmed successful modification of smectite through Fe-exchange and Ti-pillaring, and kaolinite through phosphate binding. The modified smectites were more efficient than phosphate-bound kaolinite in adsorbing As both in water and soil systems. Kinetic study revealed that the clay products reached adsorption equilibrium within 3h, and the data well fitted to the power function and simple Elovich equation (R2>0.90). The Freundlich isotherm model best described the As adsorption data (R2>0.86) of the modified clay products in both the systems. The Ti-pillared smectite exhibited the highest As adsorption capacity (156.54μgg−1) in the aqueous medium, while the Fe-exchanged smectite was the best material in the soil system (115.63μgg−1). The partition coefficient (Kd) and adsorption efficiency (%) data also maintained the similar trend. Precipitation of As and binuclear complex formation also took place in the soil system which made the metalloid non-labile as the time passed. The inorganically modified clay products reported here hold a great potential to adsorb As in contaminated groundwater, drinking water as well as soil.
HighlightsArsenic adsorption potential of modified smectite and kaolinite was studied.Ti-pillared smectite adsorbed the highest amount of arsenic in aqueous system.Fe-exchanged smectite was the most effective to adsorb arsenic in soil system.Surface complexation, ligand exchange & electrostatic attraction took place in water system.Precipitation and binuclear complex formation occurred in soil system.
Inorganically modified clay minerals: Preparation, characterization, and arsenic adsorption in contaminated water and soil
https://orcid.org/0000-0002-4196-1225
AbstractThe use of modified clay minerals for adsorbing arsenic (As) in contaminated soils is an underexplored area of research. The adsorption behavior of As onto inorganically modified smectite and kaolinite both in aqueous and soil media was studied. X-ray diffraction, infra-red spectroscopy, scanning and transmission electron microscopy studies confirmed successful modification of smectite through Fe-exchange and Ti-pillaring, and kaolinite through phosphate binding. The modified smectites were more efficient than phosphate-bound kaolinite in adsorbing As both in water and soil systems. Kinetic study revealed that the clay products reached adsorption equilibrium within 3h, and the data well fitted to the power function and simple Elovich equation (R2>0.90). The Freundlich isotherm model best described the As adsorption data (R2>0.86) of the modified clay products in both the systems. The Ti-pillared smectite exhibited the highest As adsorption capacity (156.54μgg−1) in the aqueous medium, while the Fe-exchanged smectite was the best material in the soil system (115.63μgg−1). The partition coefficient (Kd) and adsorption efficiency (%) data also maintained the similar trend. Precipitation of As and binuclear complex formation also took place in the soil system which made the metalloid non-labile as the time passed. The inorganically modified clay products reported here hold a great potential to adsorb As in contaminated groundwater, drinking water as well as soil.
HighlightsArsenic adsorption potential of modified smectite and kaolinite was studied.Ti-pillared smectite adsorbed the highest amount of arsenic in aqueous system.Fe-exchanged smectite was the most effective to adsorb arsenic in soil system.Surface complexation, ligand exchange & electrostatic attraction took place in water system.Precipitation and binuclear complex formation occurred in soil system.
Inorganically modified clay minerals: Preparation, characterization, and arsenic adsorption in contaminated water and soil
https://orcid.org/0000-0002-4196-1225
AbstractThe use of modified clay minerals for adsorbing arsenic (As) in contaminated soils is an underexplored area of research. The adsorption behavior of As onto inorganically modified smectite and kaolinite both in aqueous and soil media was studied. X-ray diffraction, infra-red spectroscopy, scanning and transmission electron microscopy studies confirmed successful modification of smectite through Fe-exchange and Ti-pillaring, and kaolinite through phosphate binding. The modified smectites were more efficient than phosphate-bound kaolinite in adsorbing As both in water and soil systems. Kinetic study revealed that the clay products reached adsorption equilibrium within 3h, and the data well fitted to the power function and simple Elovich equation (R2>0.90). The Freundlich isotherm model best described the As adsorption data (R2>0.86) of the modified clay products in both the systems. The Ti-pillared smectite exhibited the highest As adsorption capacity (156.54μgg−1) in the aqueous medium, while the Fe-exchanged smectite was the best material in the soil system (115.63μgg−1). The partition coefficient (Kd) and adsorption efficiency (%) data also maintained the similar trend. Precipitation of As and binuclear complex formation also took place in the soil system which made the metalloid non-labile as the time passed. The inorganically modified clay products reported here hold a great potential to adsorb As in contaminated groundwater, drinking water as well as soil.
HighlightsArsenic adsorption potential of modified smectite and kaolinite was studied.Ti-pillared smectite adsorbed the highest amount of arsenic in aqueous system.Fe-exchanged smectite was the most effective to adsorb arsenic in soil system.Surface complexation, ligand exchange & electrostatic attraction took place in water system.Precipitation and binuclear complex formation occurred in soil system.
Inorganically modified clay minerals: Preparation, characterization, and arsenic adsorption in contaminated water and soil
Mukhopadhyay, Raj (author) / Manjaiah, K.M. (author) / Datta, S.C. (author) / Yadav, R.K. (author) / Sarkar, Binoy (author)
Applied Clay Science ; 147 ; 1-10
2017-07-17
10 pages
Article (Journal)
Electronic Resource
English
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