The batch and column experiments on removal of As(Ⅲ) from aqueous environment by zero-valent iron (ZVI) and quartz sand mixed with ZVI were studied. The batch test results showed that removal efficiency of As(Ⅲ) by ZVI was dependent on pH value and the optimum range of pH was 4—9. As(Ⅲ) was mainly removed though adsorption and co-precipitation by the surface of ZVI and its corrosion products. Meanwhile

simultaneous oxidation and reduction of As(Ⅲ) on the surface of ZVI occurred during the corrosion process of ZVI. As(Ⅲ) was oxidized in oxidation of Fe2+ to Fe3+. Quartz sand mixed with ZVI was used for the adsorption of As(Ⅲ) from simulated arsenic-containing wastewater in the column experiment. After 20 d of continuous adsorption of As(Ⅲ)

the column was saturated. The calculated adsorption capacity of As(Ⅲ) by ZVI was 89.90 mg·g-1 and the adsorption capacity of As(Ⅲ) was affected by the crystalline types of ZVI corrosion products on the surface of quartz sand. In this study

amorphous corrosion products of ZVI had the largest adsorption capacity

and mass fraction and atom fraction reached 6.73 and 2.15 respectively.