硫化亚铁改性生物炭对水中Cr(Ⅵ)的去除机理研究

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Abstract In this study, sludge biochar loaded with nano-sized ferrous sulfide (MBC) was prepared by pyrolyzing the sludge impregnated with Fe³⁺ and S^2- ions. The preparation conditions of MBC and its removal performance on Cr(Ⅵ) were investigated, and the composites before and after reaction were characterized by SEM, TEM, XRD and XPS to explore the removal mechanism. The results show that the pyrolysis temperature (500℃) was relatively low because the presence of Fe³⁺ and S^2- ions. Acidic conditions were beneficial to the Cr(Ⅵ) removal. When the pH was 2~4 and the dosage of MBC was 2.5g/L, the removal rate of 50mg/L Cr(Ⅵ) can reach 99%. Furthermore, the combined process of MBC+NaOH (pH=7.8) can completely remove the total Fe and total Cr in the effluents. The precipitates generated from the combined process were very compact, and the effluents were colorless and transparent. The characterization results showed that nano-sized ferrous sulfide and iron oxide particles were successfully loaded on the sludge biochar and coated on the surface of the material in the form of semi-transparent film. Fe²⁺, S_n^2- and C=O on the MBC could be acted as electron donors to reduce most of Cr(Ⅵ) to form the chelated compounds such as C-O-Cr, C=O-Cr etc. The residual Cr(Ⅵ) in solution can be also adsorbed by the composites. Therefore, the removal mechanism of Cr(Ⅵ) by MBC manly included chemical reduction, complexation, and adsorption, especially reduction played the key role.

Key words： hexavalent chromium Cr(VI) sludge biochar ferrous sulfide chemical reduction

Received: 11 January 2023

PACS:

X703.1

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	LYU Si-lu
	LIU Tian
	WANG Xu
	ZUO Kai-xia
	XIE Yan-hua

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LYU Si-lu,LIU Tian,WANG Xu等. Removal and mechanism study of Cr(VI) in water by sludge biochar-supported nano-ferrous sulfide[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(8): 3935-3945.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I8/3935

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