title: Dechlorination of hexachlorobenzene using lead-iron bimetallic particles.
abstract: Synthesized lead-iron (Pb/Fe) bimetallic particles were applied to dechlorinate hexachlorobenzene (HCB) under various conditions (e.g. bimetal amount, initial pH value, reaction temperature, and reaction duration). The results showed that adding Pb onto Fe benefited the dechlorination of HCB and the bimetal with 1.4% Pb content performed best. The degradation rate decreased regularly as the initial pH value of the aqueous increased from 1.9 to 11.1 except for pH 7.0 where the fastest dechlorination rate emerged. The dechlorination could be enhanced by increasing the amount of Pb/Fe or the reaction temperature. The dechlorination ratio of HCB within 15 min increased from 24.3% to 81.3% when Pb/Fe amount increased from 0.1g to 0.8 g. The dechlorination followed pseudo-first-order kinetics, and the dechlorination rate constants were 0.0027, 0.0064, 0.0157, and 0.0321 min(-1) at 25, 50, 70, and 85 °C, respectively, and the activation energy (E(a)) of the dechlorination by Pb/Fe was 37.86 kJ mol(-1).
authors.affiliation: Key Laboratory for Solid Waste Management and Environment Safety, Ministry of Education of China, School of Environment, Tsinghua University, Beijing 100084, PR China. niexiaoqin@mail.tsinghua.edu.cn
authors.forename: Xiaoqin
authors.initials: X
authors.lastname: Nie
authors.forename: Jianguo
authors.initials: J
authors.lastname: Liu
authors.forename: Dongbei
authors.initials: D
authors.lastname: Yue
authors.forename: Xianwei
authors.initials: X
authors.lastname: Zeng
authors.forename: Yongfeng
authors.initials: Y
authors.lastname: Nie
mesh_terms: D052918:Environmental Restoration and Remediation / Q000379:methods*; D006581:Hexachlorobenzene / Q000032:analysis / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D007854:Lead / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*
chemical_list: D014874:Water Pollutants, Chemical; D007854:Lead; D006581:Hexachlorobenzene; D007501:Iron