title: Dechlorination of pentachlorophenol using nanoscale Fe/Ni particles: role of nano-Ni and its size effect.
abstract: The dechlorination of pentachlorophenol (PCP) using nano-Fe together with different size of nano-Ni particles (30, 50, 80, and 100nm) was investigated. The results indicated that nano-Ni particles could improve the dechlorination of PCP. The X-ray powder diffraction (XRD) analysis suggested that nano-Ni particles might serve as catalyst for dechlorination. The decrease of nano-Ni particle size resulted in the increase of PCP transformation and chloride release. The accumulation of several intermediates, such as phenol, 2-chlorophenol, 3-chlorophenol and 4-chlorophenol indicated the probable changes of the reaction pathway for PCP dechlorination. The corrosion products of Fe were detected using XRD analysis. In the system without nano-Ni particles, they were lepidocrocite (gamma-FeOOH) and magnetite (Fe(3)O(4)) and/or maghemite (Fe(2)O(3)), however, in the systems with nano-Ni particles, they were still magnetite/maghemite but no lepidocrocite existed. The size of nano-Ni particles might affect the crystallization of corrosion products of Fe, but did not affect the species distribution of corrosion products.
authors.affiliation: Laboratory of Environmental Technology, INET, Tsinghua University, Beijing 100084, China.
authors.forename: Rong
authors.initials: R
authors.lastname: Cheng
authors.forename: Wei
authors.initials: W
authors.lastname: Zhou
authors.forename: Jian-Long
authors.initials: JL
authors.lastname: Wang
authors.forename: Daoduo
authors.initials: D
authors.lastname: Qi
authors.forename: Lin
authors.initials: L
authors.lastname: Guo
authors.forename: Wei-Xian
authors.initials: WX
authors.lastname: Zhang
authors.forename: Yi
authors.initials: Y
authors.lastname: Qian
mesh_terms: D002713:Chlorine / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D053758:Nanoparticles; D009532:Nickel / Q000737:chemistry*; D010416:Pentachlorophenol / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D002713:Chlorine; D009532:Nickel; D010416:Pentachlorophenol; D007501:Iron