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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.
The Pd / PPy / foam-Ni electrode was prepared by electrodeposition at a deposition current density of 5 mA · cm-2 and a deposition time of 40 min. The Pd / PPy / foam- The electrochemical reduction of methyl chloride was carried out to dechlorinate and the experiment was carried out at room temperature.The electrode was tested by cyclic voltammetry and the Pd / PPy / foam-Ni electrode obtained a large hydrogen adsorption peak at -500mV (vsHg / Hg2SO4) The current value and the peak current value were -100mA.The scanning electron microscopy (SEM) analysis showed that the introduction of polypyrrole changed the deposition morphology of Pd on the electrode surface, and the surface of the electrode had good spatial extensibility.In the acidic system, Pd / PPy / foam-Ni electrode on the electrochemical reduction dechlorination of chloroform, the results show that, taking into account the removal rate of chloroform and the current efficiency of the dechlorination process, to ensure the dechlorination current efficiency of 44.17% under the conditions of the three The removal rate of methyl chloride is 49.23%, the optimal dechlorination current density is 0.05mA.cm-2 and the optimum dechlorination time is 180min, which makes it possible that in the acidic aqueous solution, the low initial concentration of trichloromethane is better Dechlorination effect.