Oxidative Adsorption of Arsenic by N-Methylglucamine-modified Chelate Fiber and Manganese Dioxide

Abstract

We investigated removal of arsenic (As) from water using a combination of adsorption on a Nmethylglucamine-modified chelate fiber and oxidation of As(III) to As(V) by manganese dioxide. Batch experiments revealed that the chelate fiber had high selectivity for As(V) over As(III), especially in the acidic pH region, because of differences in the species distribution of As in an aqueous solution. Oxidative and selective adsorption of As(III) was achieved when manganese dioxide was added to the adsorption system with the chelate fiber. The oxidative adsorption could be performed using the connected columns of the manganese dioxide and the chelate fiber. As(III) in the aqueous feed solution was oxidized to As(V) as it passed through the manganese dioxide column, and this was followed by adsorption of As(V) in the chelate fiber column. This method provides a simple removal method of As, as both As(III) and As(V),