title: Complete dechlorination of 2,4-dichlorophenol in aqueous solution on palladium/polymeric pyrrole-cetyl trimethyl ammonium bromide/foam-nickel composite electrode.
abstract: The electrochemically reductive dechlorination of 2,4-dichlorophenol (2,4-DCP) in aqueous solution on palladium/polymeric pyrrole-cetyl trimethyl ammonium bromide/foam-nickel electrode (Pd/PPy-CTAB/foam-Ni electrode) was investigated in this paper. Pd/PPy-CTAB/foam-Ni electrode was prepared and characterized by cyclic voltammetry (CV), scanning electron microscope (SEM), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) adsorption and inductively coupled plasma-atomic emission spectroscopy (ICP-AES). The influences of some experimental factors such as the dechlorination current, dechlorination time and the initial pH on the removal efficiency and the current efficiency of 2,4-DCP dechlorination on Pd/PPy-CTAB/foam-Ni electrode were studied. Complete removal of 2,4-DCP was achieved and the current efficiency of 47.4% could be obtained under the conditions of the initial pH of 2.2, the dechlorination current of 5 mA and the dechlorination time of 50 min when the initial 2,4-DCP concentration was 100 mg L(-1). The analysis of high performance liquid chromatography (HPLC) identified that the intermediate products were 2-chlorophenol (2-CP) and 4-chlorophenol (4-CP). The final products were mainly phenol. Its further reduction product cyclohexanone was also detected. The electrocatalytic dechlorination pathways of 2,4-DCP on Pd/PPy-CTAB/foam-Ni electrode were discussed. The stability of the electrode was favorable that it could keep dechlorination efficiency at 100% after having been reused 10 times. Results revealed that the stable prepared Pd/PPy-CTAB/foam-Ni electrode presented a good application prospect in dechlorination process with high effectiveness and low cost.
authors.affiliation: College of Environmental & Energy Engineering, Beijing University of Technology, Beijing 100124, PR China. zrsun@bjut.edu.cn
authors.forename: Zhirong
authors.initials: Z
authors.lastname: Sun
authors.forename: Xuefeng
authors.initials: X
authors.lastname: Wei
authors.forename: Yanbo
authors.initials: Y
authors.lastname: Han
authors.forename: Shan
authors.initials: S
authors.lastname: Tong
authors.forename: Xiang
authors.initials: X
authors.lastname: Hu
mesh_terms: D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000737:chemistry; D002713:Chlorine / Q000737:chemistry*; D002733:Chlorophenols / Q000737:chemistry*; D004563:Electrochemistry; D004566:Electrodes; D054879:Halogenation; D009532:Nickel / Q000737:chemistry; D010165:Palladium / Q000737:chemistry; D011108:Polymers / Q000737:chemistry; D011758:Pyrroles / Q000737:chemistry; D012996:Solutions; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D002593:Cetrimonium Compounds; D002733:Chlorophenols; D011108:Polymers; D011758:Pyrroles; D012996:Solutions; D014874:Water Pollutants, Chemical; D002713:Chlorine; D010165:Palladium; D009532:Nickel; C004762:2,4-dichlorophenol; D000077286:Cetrimonium