Electrogeneration of H₂ for Pd-catalytic hydrodechlorination of 2,4-dichlorophenol in groundwater

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• 作者：Mingming Zheng^a ; Jianguo Bao^a ; ^{bjianguo@cug.edu.cn} ; Peng Liao^b ; Kun Wang^a ; Songhu Yuan^a ; ^b ; ^{yuansonghu622@hotmail.com} ; Man Tong^b ; Huayun Long^b
• 关键词：Groundwater remediation ; Catalytic hydrodechlorination ; Chlorinated organics ; Electrolytic ; Barriers
• 刊名：Chemosphere
• 出版年：2012
• 期刊代码：15_00456535
• 类别：env
• 出版时间：June, 2012
• 卷：87
• 期：10
• 页码：1097-1104
• 文件大小：1558 K

摘要

A novel electrolytic groundwater remediation process, which used the H₂ continuously generated at cathode to achieve in situ catalytic hydrodechlorination, was developed for the treatment of 2,4-dichlorophenol (2,4-DCP) in groundwater. Catalytic hydrodechlorination using Pd supported on bamboo charcoal and external H₂ showed that 2,4-DCP was completely dechlorinated to phenol within 30 min at pH 猢?#xA0;5.5. In a divided electrolytic system, the catalytic hydrodechlorination of 2,4-DCP in cathodic compartment by H₂ generated at the cathode under 20 and 50 mA reached 100%at 120 and 60 min, respectively. Two column experiments with influent pHs of 5.5 (unconditioned) and 2 were conducted to evaluate the feasibility of this process. The 2,4-DCP removal efficiencies were about 63%and nearly 100%at influent pHs of 5.5 and 2, respectively. Phenol was solely produced by 2,4-DCP hydrodechlorination, and was subsequently degraded at the anode. A low pH could enhance the hydrodechlorination, but was not necessarily required. This study provides the preliminary results of a novel effective electrolytic process for the remediation of groundwater contaminated by chlorinated aromatics.