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

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Title Arsenic Adsorption on Modified Clay Minerals in Contaminated Soil and Water: Impact of pH and Competitive Anions
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Creator Raj Mukhopadhyay, Binoy sarkar, Arijit Barman, Samar Chandra Datta, K. M. Manjaiah,
 
Subject Arsenic, pH, Competitive adsorption, Soil and water remediation, Modified clays
 
Description Not Available
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.
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Date 2021-07-23T09:22:06Z
2021-07-23T09:22:06Z
2021-01-01
 
Type Article
 
Identifier Not Available
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http://krishi.icar.gov.in/jspui/handle/123456789/49541
 
Language English
 
Relation Not Available;
 
Publisher Wiley