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Reductive dechlorination of 2,4-dichlorophenol using nanoscale Fe0: influencing factors and possible mechanism

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Abstract

Nanoscale Fe0 was synthesized through a reductive method in this paper. The experiments were performed to investigate the reduction of 2,4-dichlorophenol (2,4-DCP) by nanoscale Fe0 under different conditions. The pathways for the reduction of 2,4-DCP by nanoscale Fe0 were discussed. Batch studies demonstrated that the mechanism includes adsorption, dechlorination and cleavage of the benzene ring. Dechlorination, which occurs after 2,4-DCP molecule is adsorbed on the interface of Fe particle, is an interfacial reaction. One or two chlorine atom can be removed from 2,4-DCP to form 2-chlorophenol, 4-chlorophenol or phenol. As the concentration of 2,4-DCP increased, the relative dechlorination ratio decreased. However, the reduced quantities of 2,4-DCP increased. Temperature can influence dechlorination rate and pathway. Dechlorination is prior to cleavage of the benzene ring at a higher temperature, but at a lower temperature, adsorption may be the main pathway, and cleavage of the benzene ring may be prior to dechlorination.

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Correspondence to Wang JianLong.

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Supported by the National Natural Science Foundation of China (Grant Nos. 50325824, 50678089) and the Excellent Young Teacher Program of MOE.

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Cheng, R., Wang, J. & Zhang, W. Reductive dechlorination of 2,4-dichlorophenol using nanoscale Fe0: influencing factors and possible mechanism. SCI CHINA SER B 50, 574–579 (2007). https://doi.org/10.1007/s11426-007-0066-0

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  • DOI: https://doi.org/10.1007/s11426-007-0066-0

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