Consideration on As(III) adsorption behavior in combined addition of Mg-based and Ca-based adsorbents based on adsorption isotherms and XRD analysis

Abstract

Mg-based and Ca-based adsorbents are used to remove arsenic (As) from As-contaminated water or to immobilize As in As-contaminated soil, but there are concerns on the deterioration of the adsorbent due to the leaching of base material components. On the other hand, previous studies have reported that the combined addition of Mg-based and Ca-based adsorbents has improved As removal performance and inhibited the leaching of base material components, and an adsorption behavior of arsenate As(V) was evaluated using adsorption isotherm models. However, no similar studies have been conducted on arsenite As(III), which is more toxic than As(V). Therefore, in this study, the adsorption behavior of As(III) in the combined addition of Mg-based and Ca-based adsorbents was examined based on verification of suitability with the adsorption isotherm models and results in XRD analysis.