Removal of Cadmium in Aqueous Solution by Sulfidated Nanoscale Zero-Valent Iron
2020
Weiyun Yang, Ruolin Qin, Rui Qin, Linli Zhang , Muqing Qiu
Due to mining, industrial wastewater discharge and agricultural fertilization and other human activities, heavy metal cadmium pollution in water bodies has become increasingly prominent. In this study, the sulfidated nanoscale zero-valent iron was prepared by the method of liquid-phase reduction. The removal behaviour of Cd(II) ion in aqueous solution and the effect of pH in solution on its removal rate were investigated. The synthesized materials before and after the adsorption reaction were characterized by scanning electron microscopy, X-ray diffraction and Zeta potential tester. The removal mechanism of Cd(II) ion in solution was explored in details. The results showed that the S-nZVI particles present a polymeric sheet. They contained Fe0, Fe3O4 and FeS. The removal rate of Cd(II) ion by the S-nZVI particles is higher than the nZVI particles. The reaction mechanism for S-nZVI particles to remove Cd(II) ion is that Cd(II) ion replaces Fe in FeS and then combines with S to form stable CdS compound. S has a significant effect on the oxidation process of iron.
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