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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

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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https://hal.univ-lorraine.fr/hal-01270983
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Submitted on : Monday, February 8, 2016 - 4:46:10 PM
Last modification on : Thursday, April 30, 2020 - 1:22:02 PM

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Yingxin Wu, Zihao Wu, Xiongfei Huang, Marie-Odile Simonnot, Tao Zhang, et al.. Synergistical enhancement by Ni2+ and Tween-80 of nanoscale zerovalent iron dechlorination of 2,2 `,5,5 `-tetrachlorinated biphenyl in aqueous solution. Environmental Science and Pollution Research, Springer Verlag, 2015, 22 (1), pp.555-564. ⟨10.1007/s11356-014-3278-9⟩. ⟨hal-01270983⟩

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