钯/泡沫镍阴极对水中微量氯贝酸的电催化氢化还原脱氯研究

氯贝酸（Clofibric acid， CA）是一种常见药品和个人护理品（PPCPs）类物质，在环境中具有持久性和稳定性.常规的水处理技术难以去除微量的CA，采用电催化氢化脱氯的方法可有效实现脱氯.本研究考察了CA初始浓度、工作电位、阴极液初始pH、反应温度、钯载量和电解质Na₂SO₄的浓度等多种因素对氯贝酸降解的影响.结果表明，CA的脱氯降解符合一级动力学方程，在工作电位为-0.85 V vs Ag/AgCl，钯负载量为0.20 mg·cm^-2，Na₂SO₄浓度为10 mmol·L^-1，初始阴极液pH为4.6，反应温度控制在303 K时，经过120 min的反应后，初始浓度为5 mg·L^-1的CA降解率达98%.因此利用钯/泡沫镍电极电催化还原降解废水中的CA具有很大的应用潜力.

Electrocatalytic reductive dechlorination of clofibric acid using a palladium/nickel foam electrode

As a widely used pharmaceutical and personal care products (PPCPs), clofibric acid (CA) is chemically stable and persistent in the environment. While CA is found to be resistant to conventional wastewater treatments, it can be efficiently dechlorinated by the electrocatalytic reductive dechlorination (ECH) technology. In this study, a palladium/nickel foam electrode was prepared and was employed to dechlorinate CA. The effects of the initial CA concentration, cathode potential, initial pH, reaction temperature, Pd loading, and electrolyte concentration on the ECH activity of the electrode were systematically investigated. The results showed that the electrochemical degradation of CA by ECH followed the first-order kinetics. Around 98% of CA (with the initial concentration of 5 mg·L^-1) could be efficiently removed after 120 min reaction under the optimal conditions (0.20 mg·cm^-2 Pd loading, 10 mmol·L^-1 Na₂SO₄, -0.85 V vs Ag/AgCl, pH= 4.6, and T=303 K). This work suggests that it is promising to apply the palladium/nickel foam electrode for the dechlorination of CA.