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    Rights statement: This is the peer reviewed version of the following article:Mukhopadhyay, R., Sarkar, B., Barman, A., Datta, S. C., Manjaiah, K. M., Arsenic Adsorption on Modified Clay Minerals in Contaminated Soil and Water: Impact of pH and Competitive Anions. Clean – Soil, Air, Water 2021, 2000259. https://doi.org/10.1002/clen.202000259 which has been published in final form at https://onlinelibrary.wiley.com/doi/10.1002/clen.202000259 This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.

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    Embargo ends: 9/02/22

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Arsenic Adsorption on Modified Clay Minerals in Contaminated Soil and Water: Impact of pH and Competitive Anions

Research output: Contribution to journalJournal articlepeer-review

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  • R. Mukhopadhyay
  • B. Sarkar
  • A. Barman
  • S.C. Datta
  • K.M. Manjaiah
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<mark>Journal publication date</mark>7/04/2021
<mark>Journal</mark>Clean Soil Air Water
Issue number4
Volume49
Publication StatusPublished
Early online date9/02/21
<mark>Original language</mark>English

Abstract

This study evaluates the arsenic adsorption behavior of Fe-exchanged smectite and phosphate-bound kaolinite, in soil, tap water and double distilled water in the presence of competing anions such as silicate, phosphate, and sulfate, and at variable pH values. The maximum amounts of As adsorbed in soil are 620.6 and 607.6 µg g–1 at pH 5 by Fe-exchanged smectite and phosphate-bound kaolinite, respectively. The pH-modified Freundlich equation fits well (R2 > 0.96) to the adsorption data, distinguishing the effect of pH on adsorption. The coefficients of pH-value are 0.04 and 0.05 for phosphate-bound kaolinite and Fe-exchanged smectite, suggesting that low pH is suitable for the adsorption. The As adsorption is decreased in tap water at low pH compared to the soil due to the presence of iron (Fe2+/3+), sulfate, and bicarbonate in tap water. Among the competing anions in distilled water, phosphate is the most interfering anion for As adsorption. The competition coefficients of As-phosphate binary adsorption derived from the Sheindorf equation are 3.93 and 0.56 for Fe-exchanged smectite and phosphate-bound kaolinite at pH 5. The Fe-exchanged smectite can be used more effectively than phosphate-bound kaolinite for As remediation in systems having low pH (pH ≈5) and high phosphate concentration. 

Bibliographic note

This is the peer reviewed version of the following article:Mukhopadhyay, R., Sarkar, B., Barman, A., Datta, S. C., Manjaiah, K. M., Arsenic Adsorption on Modified Clay Minerals in Contaminated Soil and Water: Impact of pH and Competitive Anions. Clean – Soil, Air, Water 2021, 2000259. https://doi.org/10.1002/clen.202000259 which has been published in final form at https://onlinelibrary.wiley.com/doi/10.1002/clen.202000259 This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.