文献类型：期刊文献

中文题名：3D自支撑钴基硫化物电极电催化还原硝酸盐特性研究

英文题名：Research on the characteristics of nitrate electroreduction by 3D self-supported cobalt-based sulfide electrode

作者：肖晓[1,2];罗章奕[1];何玮钰[1];李安旎[1];陈浩[1];赵辉[1,2];孙东[1,2];潘纲[2,3]

机构：[1]广东海洋大学化学与环境学院,湛江524088;[2]海岸带环境保护与生态修复中心,湛江524088;[3]约克圣约翰大学人文学院,英国YO317EX

年份：2024

卷号：44

期号：5

起止页码：92

中文期刊名：环境科学学报

外文期刊名：Acta Scientiae Circumstantiae

收录：北大核心2023、CSTPCD、、Scopus、CSCD2023_2024、北大核心、CSCD

基金：广东省教育厅青年创新人才项目(No.2021KQNCX027);湛江市海洋青年人才创新项目(No.2021E05016);湛江市科技计划项目(No.2022A01007);国家级大学生创新创业训练计划项目(No.202210566032);广东海洋大学科研启动经费资助项目(No.060302122010)。

语种：中文

中文关键词：电催化还原;电沉积;钴基硫化物电极;硝酸盐;N_(2)选择性

外文关键词：electrocatalytic reduction;electrodeposition;CoxS/NF;nitrate;N2 selection

中文摘要：针对水体硝酸盐污染严重的问题,本研究以泡沫镍(NF)为基底材料,采用恒电流沉积法制备了3D自支撑钴基硫化物电极—CoxS/NF,用于电催化还原硝酸盐.重点研究了CoxS/NF电极制备参数和电解工作条件对硝酸盐去除的影响规律及其硝酸盐还原机制.研究结果表明,在硝酸盐初始浓度为50 mg·L^(-1)(以NO_(3)^(-)N计),工作电流为4.0 mA,反应时间为180 min的条件下,硫脲浓度为0.8 mol·L^(-1)和沉积电流为0.7 mA条件下制备的CoxS/NF电极(2 cm×2 cm)表现出最佳的硝酸盐去除效果,其硝酸盐去除率为79.0%,N2选择性高达93.6%.该过程符合伪一级动力学反应方程,反应速率常数为0.0077 min^(-1).CoxS/NF电极还表现出优异的Cl^(-)耐受性和重复使用性.循环伏安、计时电流和塔菲尔测试结果表明超薄纳米片CoxS的引入能有效增加电极与硝酸根离子的接触面积,改善了CoxS/NF电极的硝酸盐电催化活性和稳定性.

外文摘要：In order to solve the issue of water nitrate pollution,herein,a 3D self-supported CoxS/NF electrode was fabricated through constant current deposition with nickel foam as the substrate material for nitrate electroreduction.The influence of CoxS/NF electrode preparation parameters and electrolytic working condition on nitrate removal was discussed,and the electroreduction mechanism of CoxS/NF was also revealed.The results showed that,under the conditions of initial NO_(3)^(-)-N concentration of 50 mg·L^(-1),working current of 4.0 mA and reaction time of 180 min,the CoxS/NF electrode fabricated at thiourea concentration of 0.8 mol·L^(-1) and deposition current of 0.7 mA had exhibited the best nitrate removal efficiency.The corresponding nitrate removal efficiency is 79.0%,and a high N_(2) selection of 93.6% was obtained.The above removal process could be conformed to the pseudo-firstorder kinetic reaction equation with a reaction rate constant of 0.0077 min^(-1).In addition,the as-made CoxS/NF electrode also displayed excellent Cltolerance and reusability.The results of cyclic voltammetry,chronograph current and Tafel test further suggested that the existence of ultrathin CoxS nanosheet had increased the contact area between electrode and nitrate ion,and then improved the electrocatalytic activity and stability of CoxS/NF electrode.