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Published on: January 6, 2016
[Electrochemical degradation of sodium pentachlorophenol on a Pd/C gas-diffusion electrode]
1College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China. wanghui616@gmail.com
Abstract:
Pd/C catalyst was prepared by hydrogen reduction method and used for the Pd/C gas-diffusion electrode. It was characterized by cyclic voltammetry (CV) techniques. The electrochemical degradation of sodium pentachlorophenol (PCP-Na) was investigated in a diaphragm electrolysis device, feeding firstly with hydrogen gas then with air, using the Pd/C gas-diffusion electrode and the carbon/polytetrafluoroethylene (C/PTFE) gas-diffusion electrode as the cathode, respectively. The results indicate that the two-electron reduction from O2 to hydrogen peroxide (H2O2) is produced at the Pd/C gas-diffusion electrode, and the accumulated H2O2 in the cathodic compartment reach to the steady concentration of 9.8 mg/L after 100 min. The Pd/C gas-diffusion cathode can reductively dechlorinate PCP-Na by feeding hydrogen gas, and accelerate the two-electron reduction of O2 to hydrogen peroxide (H2O2) by feeding air. Therefore, both the removal efficiency and the dechlorination degree of PCP-Na exceed 80% after 100 min, and the average removal efficiency of PCP-Na in terms of total organic carbon (TOC) exceeds 75% after 200 min by using Pd/C gas-diffusion cathode,which is better than that of the C/PTFE gas-diffusion cathode. High performance liquid chromatography (HPLC) allows identifying phenol as the dechlorination product.
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