Mechanism analysis of MnFe2O4/FeSX for removal of Cr(VI) from aqueous phase

Ecotoxicology and Environmental Safety

Shengsen Wang¹  Weiqin Yin²  Qiuyue Xu²  Jianhua Hou²  Jie Wang²  Xiaozhi Wang² 

[1] Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, PR China;College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225000, PR China;

关键词: Chromium;    Sulfur-doping;    Adsorption;    Reduction;    Electron transfer;    Valence conversion;   

DOI  :  

来源: DOAJ

【 摘 要 】

By using Na2S as a sulfur source, sulfur-doped MnFe2O4 was prepared using one-step solvent thermal method and utilized to remove hexavalent chromium. The materials were characterized through scanning electron microscopy, transmission electron microscopy, high-resolution TEM, X-ray diffraction, Fourier-transform infrared spectroscopy, Brunauer–Emmett–Teller method, zeta potential test, vibrating sample magnetometry, and X-ray photoelectron spectroscopy. When the pH was 3, the adsorption capacity of MnFe2O4/FeSX-0.5 to Cr(VI) was 43.36 mg/g, which was roughly five times that of MnFe2O4 (8.90 mg/g). MnFe2O4/FeSX-0.5 and MnFe2O4 fitted the Freundlich and pseudo-second-order kinetic models well. The electrochemical test analysis results showed that MnFe2O4/FeSX had a faster MnFe2O4 electron transfer rate and higher electron transfer capacity than MnFe2O4, and thus promoted the reduction of Cr(VI) to Cr(III). This finding could be attributed to the lower electronegativity of the sulfur element than the oxygen element. In addition, the formation of additional FeSX through sulfur doping improved the Cr(VI) removal ability of the prepared materials. The XPS and desorption results showed that more than 80% of the adsorbed Cr(VI) were reduced to Cr(III), which indicated that reduction was an important mechanism for Cr(VI) removal. This study verified that sulfur-doped manganese ferrite can be utilized in the high-efficiency removal of Cr(VI).

【 授权许可】

Unknown