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

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