title: 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 Ni(2+), Cu(2+) 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 Ni(2+), while Cu(2+) had a less significant catalytic effect. Ni(2+) 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 Cu(2+) 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 Ni(2+) and Tween-80 is a promising technique for posttreatment of PCB-contaminated soil washing solutions.
authors.affiliation: School of Environmental Science and Engineering, Guangdong Provincial Key Lab of Environmental Pollution Control and Remediation, Sun Yat-sen University, D604, Dihuan Building, 135 Xingang Xi Road, Guangzhou, 510275, People's Republic of China.
authors.forename: Yingxin
authors.initials: Y
authors.lastname: Wu
authors.forename: Zihao
authors.initials: Z
authors.lastname: Wu
authors.forename: Xiongfei
authors.initials: X
authors.lastname: Huang
authors.forename: Marie-Odile
authors.initials: MO
authors.lastname: Simonnot
authors.forename: Tao
authors.initials: T
authors.lastname: Zhang
authors.forename: Rongliang
authors.initials: R
authors.lastname: Qiu
mesh_terms: D001713:Biphenyl Compounds; D002713:Chlorine; D004787:Environmental Pollution; D054879:Halogenation; D007501:Iron; D008670:Metals; D009532:Nickel / Q000737:chemistry; D011078:Polychlorinated Biphenyls / Q000737:chemistry*; D011136:Polysorbates / Q000737:chemistry / Q000378:metabolism; D012989:Soil Pollutants / Q000737:chemistry*; D013501:Surface-Active Agents
chemical_list: D001713:Biphenyl Compounds; D002713:Chlorine; D007501:Iron; D008670:Metals; D009532:Nickel; D011078:Polychlorinated Biphenyls; D011136:Polysorbates; D012989:Soil Pollutants; D013501:Surface-Active Agents; C009407:2,5,2',5'-tetrachlorobiphenyl; C010574:biphenyl
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