【摘要】 在沉积电流密度5mA.cm-2,沉积时间40min条件下,通过电沉积方法制备Pd/PPy/泡沫镍(foam-Ni)电极,以Pd/PPy/foam-Ni电极为阴极研究酸性体系中三氯甲烷的电化学还原脱氯,实验在室温条件下进行.采用循环伏安法对电极进行测试,Pd/PPy/foam-Ni电极在-500mV(vsHg/Hg2SO4)左右获得很大的氢吸附峰电流值,峰电流值为-100mA.扫描电镜(SEM)分析表明,聚吡咯的引入改变了Pd在电极表面的沉积形态,使电极表面具有很好的空间延伸性.在酸性体系中进行Pd/PPy/foam-Ni电极对三氯甲烷的电化学还原脱氯实验,结果表明,综合考虑三氯甲烷去除率及脱氯过程电流效率,在保证脱氯过程电流效率为44.17%的条件下,三氯甲烷的去除率为49.23%,此时最佳脱氯电流密度为0.05mA.cm-2,最佳脱氯时间为180min,实现了在酸性水溶液体系中,低初始浓度三氯甲烷较好的脱氯效果.更多还原

【Abstract】 Palladium/polymeric pyrrole film/foam-nickel（Pd/PPy/foam-Ni）composite electrode were prepared by the electrodeposition method with the electrodepositing current density of 5 mA·cm-2 and the electrodepositing time of 40 min.Electrochemical reductive dechlorination of chloroform in acidic system was investigated using the Pd/PPy/foam-Ni electrode at ambient temperature.The electrochemical deposition behaviors of Pd/PPy/foam-Ni electrode were studied by means of cyclic voltammetry（CV）.Cyclic voltammetry results reveal that the large hydrogen adsorption peak current of-100 mA on Pd/PPy/foam-Ni electrode was obtained at about-500 mV（vs Hg/Hg₂SO₄）.SEM micrographs show that the addition of polymeric pyrrole changed the distributing configuration of Pd microparticles on the electrode and Pd/PPy/foam-Ni electrode possessed a good spatial extension.Chloroform dechlorination experimentes were conducted in acid system.Dechlorination experimental results indicate that,with the integrated analysis of removal efficiency and current efficiency,with the high current efficiency of 44.17%,the removal efficiency of chloroform on Pd/PPy/foam-Ni electrode was 49.23%,under the optimum conditions of the dechlorination current density of 0.05 mA·cm-2 and the dechlorination time of 180 min.In acid aqueous solution,with low initial concentration of chloroform,the results of dechlorination experiment were preferable.更多还原