摘要
为了改善导电聚合物基电极材料在电化学还原去除水溶液中Cu(Ⅱ)的效果,采用交联改性法制备了交联聚邻苯二胺(交联PoPD),并采用红外吸收光谱(FT-IR)、紫外-可见吸收光谱(UV-Vis)、X-射线粉末衍射(XRD)、N_(2)吸脱附曲线(BET)、扫描电子显微镜(SEM)及透射电子显微镜(TEM)等手段对其进行了表征。以交联PoPD涂覆的石墨电极为工作电极,利用电化学还原电沉积法去除水溶液中的Cu(Ⅱ),筛选出电化学还原法的最适宜条件:电极电位为-0.4 V,Cu(Ⅱ)的初始质量浓度为15 mg/L,溶液的初始pH为4,电解时间为10 h,在此条件下Cu(Ⅱ)去除率可达83.28%,并且电沉积过程遵循准一级动力学模型,电极重复使用5次后脱附率保持在94.09%以上。电化学还原法去除Cu(Ⅱ)前后工作电极的SEM、SEM-mapping以及BET测试结果表明:Cu均匀沉积于电极表面,Cu(Ⅱ)的去除为吸附与电沉积的共同结果。以上结果表明交联PoPD在水体重金属离子的电化学法去除方面具有一定的应用潜能。
In order to improve the effect of electrochemical reduction of Cu(Ⅱ)in aqueous solution by conductive polymer-based electrode materials,crosslinked poly(o-phenylenediamine)(crosslinked PoPD)was prepared by a crosslinking modification method and characterized by infrared absorption spectroscopy(FT-IR),ultraviolet-visible absorption spectroscopy(UV-Vis),X-ray powder diffraction(XRD),N_(2)adsorption-desorption curves(BET),scanning electron microscopy(SEM)and transmission electron microscopy(TEM).Using a graphite electrode coated with crosslinked PoPD as the working electrode,Cu(Ⅱ)was removed from aqueous solution by electrochemical reduction electrodeposition.The optimum conditions for electrochemical reduction were as follows:the electrode potential was-0.4 V,the initial mass concentration of Cu(Ⅱ)was 15 mg/L,the initial pH of the solution was 4,and the electrodeposition time was 10 h.Under these conditions,the removal rate of Cu(Ⅱ)can reach 83.28%,and the electrodeposition process follows a pseudo-first-order kinetic model.The desorption rate remained above 94.09%after the electrode was reused five times.The SEM,SEM-mapping and BET test results of the working electrode before and after the removal of Cu(Ⅱ)by electrochemical reduction showed that Cu was uniformly deposited on the electrode surface,and the removal of Cu(Ⅱ)resulted from both adsorption and electrodeposition.The results indicate that the crosslinked PoPD has potential applications in the electrochemical removal of heavy metal ions from water.
作者
卡米来·买买提
孟宇
付家龙
阿孜古丽·木尔赛力木
MAMAT Kamila;MENG Yu;FU JiaLong;MUSLIM Arzugul(College of Chemistry and Chemical Engineering,Xinjiang Normal University,Urumqi 830054;Xinjiang Key Laboratory of Energy Storage and Photoelectric Catalytic Materials,Urumqi 830054,China)
出处
《北京化工大学学报（自然科学版）》
CAS
CSCD
北大核心
2023年第2期26-37,共12页
Journal of Beijing University of Chemical Technology(Natural Science Edition)
基金
2020年新疆维吾尔自治区创新环境(人才、基地)建设专项天山青年计划项目(2020Q018)
新疆师范大学大学生创新训练计划项目(X202210762061)。
关键词
聚邻苯二胺
交联
电沉积
去除
铜离子
poly(o-phenylenediamine)
cross-linking
electrodeposition
removal
copper ion
