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Effects of Surfactant on the Degradation of 2,2',4,4'-tetrabromodiphenyl Ether (BDE-47) by Nanoscale Ag/Fe Particles: Kinetics, Mechanisms and Intermediates

Effects of Surfactant on the Degradation of 2,2',4,4'-tetrabromodiphenyl Ether (BDE-47) by Nanoscale Ag/Fe Particles: Kinetics, Mechanisms and Intermediates

Zhiqiang Zheng, Guining Lu, Rui Wang, Kaibo Huang, Xueqin Tao, Yulu Yang, Mengyao Zou, Yingying Xie, Hua Yin, Zhenqing Shi, Zhi Dang

Environ Pollut. 2019 Feb;245:780-788.

PMID: 30504035

Abstract:

Surfactants are known to enhance the degradation of halogenated organics by nanoscale zerovalent iron (n-ZVI) or n-ZVI-based bimetallic particles, but the mechanism of the promotion is not well understood. In this study, we used nanoscale Ag/Fe particles (n-Ag/Fe) to degrade 2,2',4,4'-tetrabromodiphenyl ether (BDE-47) in different surfactant solutions. The results show that the nonionic surfactant TX-100 had the best promoting effect, which might be attributed to the decrease in particle agglomeration and improvement of mass transfer efficiency after the adsorption of TX-100 on n-Ag/Fe. The distribution analysis of BDE-47 in solid and liquid phases indicates that when the concentration of TX-100 in aqueous solution was above critical micelle concentration, BDE-47 started to dissolve in the liquid phase. Thus, TX-100 micelles can enhance the mass transfer efficiency of BDE-47. However, a too high concentration of TX-100 (above 1.0 mM) would influence the promotion effect of BDE-47 degration, which might be attributed to the excessive and thicker micelles of TX-100 hindering the contact between BDE-47 and n-Ag/Fe. We also studied the degradation pathway of BDE-47 and its products, and found that surfactants did not change the degradation pathway of BDE-47.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP5436431	BDE No 47 solution		5436-43-1	Price

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