Rh-MoS_(2)/泡沫镍电催化还原对氟苯酚  

Electrocatalytic reduction of p-fluorophenol using Rh-MoS_(2)/Nickel foam electrode

作　　者：周洋 何叶子 陈水平[1] ZHOU Yang;HE Yezi;CHEN Shuiping(College of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学资源与环境工程学院,湖北武汉430070

出　　处：《化工环保》2024年第2期179-187,共9页Environmental Protection of Chemical Industry

基　　金：国家自然科学基金面上项目(21277108)。

摘　　要：采用电沉积法制备了MoS_(2)/泡沫镍电极,在此基础上,通过原子掺杂的方式制备了Rh-MoS_(2)/泡沫镍复合电极,运用多种手段表征了电极的结构、形貌和电化学性能,比较了掺杂Rh前后MoS_(2)/泡沫镍电极对对氟苯酚(4-FP)的催化还原效果,探讨了4-FP的降解机理。表征结果显示:Rh的掺杂促进了2H相MoS_(2)转变为1T相MoS_(2),改善了MoS_(2)的催化性能;在0.05 mol/L的Na_(2)SO_(4)溶液中,当电流密度为10 mA/cm^(2)时,Rh-MoS_(2)/泡沫镍的过电位和Tafel斜率分别为190.3 mV和70 mV/dec,远低于MoS_(2)/泡沫镍。实验结果表明:在工作电位-1.3 V、初始pH 3.3、温度293 K的条件下,电解180 min后,Rh-MoS_(2)/泡沫镍复合电极对4-FP的去除率为96%;Rh-MoS_(2)/泡沫镍复合电极催化还原4-FP的主要活性物种为e-和活性氢(H*);经过5次循环实验,Rh-MoS_(2)/泡沫镍复合电极对4-FP的去除率由96%降低至88%,表现出良好的稳定性。The MoS_(2)/nickel foam electrode was prepared by electrodeposition.On this basis,the Rh-MoS_(2)/nickel foam composite electrode was prepared by means of atomic doping.The structure,morphology and electrochemical properties of the electrode were characterized by various means.The effect of MoS_(2)/nickel foam electrode on catalytic reduction of p-fluorophenol(4-FP)before and after Rh doping was compared to investigate the degradation mechanism of 4-FP.The characterization results show that:The doping of Rh promotes the conversion of 2H phase MoS_(2)to 1T phase MoS_(2),which improves the catalytic capability of MoS_(2);In 0.05 mol/L Na_(2)SO_(4)solution,when the current density is 10 mA/cm^(2),the overpotential and Tafel slope of Rh-MoS_(2)/nickel foam are 190.3 mV and 70 mV/dec respectively,which are much lower than those of MoS_(2)/nickel foam.The experimental results show that:The removal rate of 4-FP by Rh-MoS_(2)/nickel foam composite electrode is 96%under the conditions of working potential-1.3 V,initial pH 3.3,temperature 293 K and electrolysis time 180 min;The main active species for catalytic reduction of 4-FP catalyzed by Rh-MoS_(2)/Nickel foam electrode are e-and active hydrogen(H*);After 5 cycles of experiments,the removal rate of 4-FP by Rh-MoS_(2)/Nickel foam composite electrode decreases from 96%to 88%,showing good stability of the composite electrode.

关 键 词：纳米铑 沉积状MoS_(2) 电沉积 电催化脱氟 活性氢 

分 类 号：X703[环境科学与工程—环境工程]