VB<sub>12</sub>协同Fe/Cu双金属去除二氯甲烷过程调控与机理

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Abstract

Functionalized Fe/Cu bimetallic nanoparticles were prepared in this work for remediation of recalcitrant low-halogenated alkanes, for which the reducing capacity and process-enhancement control were investigated dealing with dichloromethane (DCM) as representative contaminant. Results show that vitamin B₁₂ significantly promoted the performance of Fe/Cu bimetal, since rate constant of DCM-reduction for Fe/Cu-B₁₂system (0.444h^-1) exhibited much higher than that of Fe/Cu system (0.018h^-1) or Fe-B₁₂ system (0.03h^-1), implying the synergistic effect of Cu and B₁₂ on electron-donating ability of zero-valent iron. Experiments were further conducted for process control, and results showed that 5% surface Cu-coverage and pH 9.5benefits better the catalytic reduction of DCM. Possible mechanism on catalytic performance of Fe/Cu-B₁₂ system was discussed referring to analysis on intermediate product as well as reduction kinetics. We speculated that the intermediate was prepared by dechlorination of target organic with B₁₂as an active electron acceptor on surface of Cu⁰, and then quickly decomposed to B₁₂ and hydrogenated halide, the catalytic process was completed under synergistic effects of Fe (electron donor), Cu and B₁₂.

Key words： Fe/Cu bimetal vitamin B₁₂ dichloromethane catalytic dechlorination

Received: 20 January 2016

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	Articles by authors
	LIN Ying-jie
	ZHANG Shuo
	SUN Li-ping
	XING Yue

Cite this article:

LIN Ying-jie,ZHANG Shuo,SUN Li-ping等. Synergistic effect of vitamin B₁₂ and Fe/Cu bimetal on reduction of dichloromethane: Mechanism study and process control[J]. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(9): 2650-2657.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2016/V36/I9/2650

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