Inorganically modified clay minerals:Preparation, characterization, and arsenic adsorption in contaminated water and soil

Mukhopadhyay, Raj and Manjaiah, K.M. and Datta, S.C. and Yadav, R.K. and Sarkar, Binoy (2017) Inorganically modified clay minerals:Preparation, characterization, and arsenic adsorption in contaminated water and soil. Applied Clay Science, 147. pp. 1-10. ISSN 0169-1317

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Abstract

The 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 3 h, 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 (156.54 μg g− 1) in the aqueous medium, while the Fe-exchanged smectite was the best material in the soil system (115.63 μg g− 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.

Item Type:
Journal Article
Journal or Publication Title:
Applied Clay Science
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1900/1907
Subjects:
ID Code:
140642
Deposited By:
Deposited On:
27 Jan 2020 15:15
Refereed?:
Yes
Published?:
Published
Last Modified:
16 Sep 2020 06:07