Application of Hematite and Magnetite for Arsenic Removal from Aqueous Solution

Abstract

ABSTRACT

Arsenic is a ubiquitous element found in the atmosphere, soils and rocks, natural waters and organisms. In this study, removal efficiencies of arsenate from aqueous solution by adsorption with hematite and magnetite as adsorbents have been performed. The effects of important operating parameters such as contact time, pH, and amount of adsorbent on percent removal of arsenic were investigated. According to results of the experimental studies, more than 75% arsenate removal was achieved if the pH is 4 for both magnetite and hematite. In the initial arsenate concentration of 100 µg L^-1, the arsenate concentration is reduced below 25 µg L^-1 at magnetite dose of 3 g, while in the initial arsenate concentrations of 100 µg L-1, the highest arsenate removal efficiency, about 78%, was provided at hematite dose of 3 g.