Fabrication of pyrite-zero nickel composites for efficient removal of Se(IV) from aqueous solution
Yanjun Du, Qing Zhou, Jiankun Zhao, Hexi Wu, Xiaoyan Li, Yibao Liu, Zhanggao Le
Abstract
Abstract 79 Se is one of the important radionuclides in the safety evaluation of high-level radioactive waste repository due to its long half-life and highly fissionable radioactivity. Nanoscale pyrite-zero nickel composites (FeS 2 /Ni 0 ) were fabricated by ball milling method for selenium(IV) (Se(IV)) adsorption from aqueous solution. The effects of pH, solid-liquid ratio, time, temperature, initial concentration of Se(IV) on the adsorption of Se(IV) by FeS 2 /Ni 0 were investigated. FeS 2 /Ni 0 was characterized by SEM, XPS, XRD, FT-IR, BET and Zeta potential, and the mechanism of removing Se(IV) was analyzed. The results showed that FeS 2 /Ni 0 had a good removal effect on Se(IV). When pH was 5.5, the solid-liquid ratio was 0.1 g L −1 , the reaction time was 40 min, the maximum adsorption capacity of Se(IV) by FeS 2 /Ni 0 could reach 259 mg g −1 . The research results can provide a theoretical basis for the treatment of wastewater containing Se(IV).