title: [Electrochemically reductive dechlorination of chloroform by palladium/polymeric pyrrole film/foam-nickel composite electrode in acidic system].
abstract: Palladium/polymeric pyrrole film/foam-nickel (Pd/PPy/foam-Ni) composite electrode were prepared by the electrodeposition method with the electrodepositing current density of 5 mA x cm(-2) and the electrodepositing time of 40 min. Electrochemical reductive dechlorination of chloroform in acidic system was investigated using the Pd/PPy/foam-Ni electrode at ambient temperature. The electrochemical deposition behaviors of Pd/PPy/foam-Ni electrode were studied by means of cyclic voltammetry (CV). Cyclic voltammetry results reveal that the large hydrogen adsorption peak current of -100 mA on Pd/PPy/foam-Ni electrode was obtained at about -500 mV (vs Hg/Hg2 SO4). SEM micrographs show that the addition of polymeric pyrrole changed the distributing configuration of Pd microparticles on the electrode and Pd/PPy/foam-Ni electrode possessed a good spatial extension. Chloroform dechlorination experimentes were conducted in acid system. Dechlorination experimental results indicate that, with the integrated analysis of removal efficiency and current efficiency, with the high current efficiency of 44.17%, the removal efficiency of chloroform on Pd/PPy/foam-Ni electrode was 49.23%, under the optimum conditions of the dechlorination current density of 0.05 mA x cm(-2) and the dechlorination time of 180 min. In acid aqueous solution, with low initial concentration of chloroform, the results of dechlorination experiment were preferable.
authors.affiliation: Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China. zrsun@bjut.edu.cn
authors.forename: Zhi-Rong
authors.initials: ZR
authors.lastname: Sun
authors.forename: Hui
authors.initials: H
authors.lastname: Ge
authors.forename: Xiang
authors.initials: X
authors.lastname: Hu
authors.forename: Yong-Zhen
authors.initials: YZ
authors.lastname: Peng
mesh_terms: D002725:Chloroform / Q000737:chemistry* / Q000302:isolation & purification; D004563:Electrochemistry; D004566:Electrodes; D054879:Halogenation; D009532:Nickel / Q000737:chemistry; D010165:Palladium / Q000737:chemistry; D011108:Polymers; D011758:Pyrroles / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D011108:Polymers; D011758:Pyrroles; D010165:Palladium; D009532:Nickel; D002725:Chloroform