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Synergistical enhancement by Ni2+ and Tween-80 of nanoscale zerovalent iron dechlorination of 2,2’,5,5’-tetrachlorinated biphenyl in aqueous solution

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Abstract

Effective dehalogenation by nanoscale zerovalent iron (nZVI) has been reported. In this study, the effects of Ni2+, Cu2+ ions, and the nonionic surfactant Tween-80 on dechlorination of 2,2’,5,5’-tetrachlorinated biphenyl (PCB-52) by nZVI were investigated in aqueous solution. The rate of dechlorination was significantly enhanced by Ni2+, while Cu2+ had a less significant catalytic effect. Ni2+ and Tween-80 used in combination synergistically enhanced dechlorination of PCB-52 by nZVI, although the enhancement by Tween-80 was inhibitory in the presence of Cu2+ and insignificant in the absence of both metal ions. Congener specificity in the dechlorination pathway resulted from the preferential retention of ortho-chlorine, which restricted the formation of environmentally toxic coplanar PCB congeners. The application of nZVI dehalogenation enhanced by Ni2+ and Tween-80 is a promising technique for posttreatment of PCB-contaminated soil washing solutions.

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Acknowledgments

This study was supported by the National Natural Science Foundation of China (No. 41171374, No. 41225004), the National High Technology Research and Development Program (863 program) of China (No. 2012AA06A202), and the Franco-Chinese Programme Cai Yuanpei 2013 (No.30348 VB). The Authors gratefully acknowledge the Sino-French Joint Laboratory of Soil Contamination Remediation.

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Correspondence to Rongliang Qiu.

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Responsible editor: Hongwen Sun

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Wu, Y., Wu, Z., Huang, X. et al. Synergistical enhancement by Ni2+ and Tween-80 of nanoscale zerovalent iron dechlorination of 2,2’,5,5’-tetrachlorinated biphenyl in aqueous solution. Environ Sci Pollut Res 22, 555–564 (2015). https://doi.org/10.1007/s11356-014-3278-9

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  • DOI: https://doi.org/10.1007/s11356-014-3278-9

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