Electrocatalytic dechlorination of 2,4-dichlorophenol in aqueous solution on palladium loaded meshed titanium electrode modified with polymeric pyrrole and surfactant

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• 作者：Zhirong Sun^a ; ^{zrsun@bjut.edu.cn} ; Xuefeng Wei^a ; ^c ; Xiang Hu^b ; ^{huxiang99@163.com} ; Kun Wang^a ; Haitao Shen^a
• 关键词：Electrochemical hydrodechlorination ; Polymeric pyrrole ; Sodium dodecyl sulfonate ; 2 ; 4-Dichlorophenol ; Meshed titanium
• 刊名：Colloids and Surfaces A: Physicochemical and Engineering Aspects
• 出版年：2012
• 出版时间：20 November, 2012
• 年：2012
• 卷：414
• 期：Complete
• 页码：314-319
• 全文大小：1047 K

文摘

The electrochemically reductive dechlorination of 2,4-dichlorophenol (2,4-DCP) in aqueous solution on palladium/polymeric pyrrole-sodium dodecyl sulfonate film/meshed titanium electrode (Pd/PPy-SLS/Ti electrode) was investigated in this paper. The Pd/PPy-SLS/Ti electrode was prepared by electrodesposition and characterized in terms of surface morphology (SEM), structural feature (XRD), specific surface area (BET) and Pd loading level (ICP-AES). Effects of the dechlorination current and the initial pH value of the solution on the removal efficiency and the current efficiency were studied in the 2,4-DCP dechlorination process on Pd/PPy-SLS/Ti electrode. Effective removal of 2,4-DCP was achieved with removal efficiency of 100 % and current efficiency of 33.9 % in the presence of 100 mg L^?1 2,4-DCP under the conditions of initial pH of 2.36, dechlorination current of 5 mA and dechlorination time of 70 min. 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 stability of the electrode was good that the dechlorination efficiency was maintained at 100 % after having been reused 8 times. The stable electrode demonstrated a promising application prospect in dechlorination process with high effectiveness and low cost.