title: Preparation and characterization of PbO₂ electrode and its application in electro-catalytic degradation of o-aminophenol in aqueous solution assisted by CuO-Ce₂O₃/γ-Al₂O₃ catalyst.
abstract: The electrochemical degradation of o-aminophenol (OAP) in aqueous solution was investigated by galvanostatic electrolysis using PbO₂ electrode as anode. The Ti/SnO₂-Sb₂O₃/PbO₂ anode was prepared by thermal decomposition and electro-deposition method, and was characterized by X-ray diffraction (XRD). The hydroxyl radicals electro-generated on anode were detected by fluorescence spectroscopy. The effects of initial pH and current density on the efficiency of the electrochemical degradation process were also studied. UV spectroscopy and chemical oxygen demand (COD) measurements were conducted to evaluate the removal effects of organic pollutants. The experimental results showed that the refractory organics in wastewater can be removed by pure electrochemical process, COD removal efficiency of 91.6% was obtained in 70 min at initial pH 11.0 and current density was equal to 50 mA cm(-2). In order to improve the efficiency of degradation and accelerate the reaction rate, a novel catalyst, γ-Al₂O₃ supported Ce-doped CuO, was synthesized by impregnating process and was characterized by X-ray photoelectron spectroscopy (XPS). The catalyst exhibited excellent catalytic activity in the electro-catalytic degradation of OAP wastewater and the COD removal efficiency of 91.7% was obtained in 20 min under mild conditions. Finally, a hypothetical mechanism of electro-catalytic degradation was proposed.
authors.affiliation: Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, PR China. cft0923@163.com
authors.forename: Fengtao
authors.initials: F
authors.lastname: Chen
authors.forename: Sanchuan
authors.initials: S
authors.lastname: Yu
authors.forename: Xiaoping
authors.initials: X
authors.lastname: Dong
authors.forename: Ling
authors.initials: L
authors.lastname: Zhang
authors.forename: Qiangfang
authors.initials: Q
authors.lastname: Wu
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry; D000627:Aminophenols / Q000032:analysis / Q000737:chemistry*; D002384:Catalysis; D004563:Electrochemistry; D004566:Electrodes; D006863:Hydrogen-Ion Concentration; D017665:Hydroxyl Radical / Q000737:chemistry; D007854:Lead / Q000737:chemistry*; D008956:Models, Chemical; D009930:Organic Chemicals / Q000737:chemistry; D010087:Oxides / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000379:methods; D062065:Wastewater; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry; D018508:Water Purification / Q000379:methods; D014961:X-Ray Diffraction
chemical_list: D000537:Aluminum Oxide; D000627:Aminophenols; D017665:Hydroxyl Radical; D007854:Lead; D009930:Organic Chemicals; D010087:Oxides; D062065:Wastewater; D014874:Water Pollutants, Chemical; C027667:2-aminophenol; C047365:lead oxide
keywords: Electrochemical catalytic degradation; PbO(2) electrode; Wastewater treatment; o-Aminophenol wastewater