聚多巴胺修饰电极用于水中痕量Pb^(2+)的测定  

Detection of Trace Pb^(2+) in Water by Polydopamine-Modified Electrodes

作　　者：孙文博 姜一洁 李佳男 彭冲[3] Sun Wenbo;Jiang Yijie;Li Jianan;Peng Chong(School of Resources and Environmental Engineering,Shandong University of Technology,Zibo Shandong 255000,China;School of Resources and Environmental Engineering,East China University of Science and Technology,Shanghai 200237,China;School of Sensing Science and Engineering,Shanghai Jiaotong University,Shanghai 200240)

机构地区：[1]山东理工大学资源与环境工程学院,山东淄博255000 [2]华东理工大学资源与环境工程学院,上海200237 [3]上海交通大学感知科学与工程学院,上海200240

出　　处：《石油化工高等学校学报》2022年第6期74-80,共7页Journal of Petrochemical Universities

基　　金：国家自然科学基金项目(22006039、52100128、22122807);山东省自然科学基金项目(ZR2020QB141);上海市自然科学基金项目(21ZR1425700)。

摘　　要：环境中Pb^(2+)的浓度是环保管控领域重要的监测指标之一,过量Pb^(2+)的存在对人类健康及环境生态稳定构成严重威胁。通过简易原位电致聚合的方法,成功地将聚多巴胺涂层修饰于电极表面,并将其应用于水中痕量Pb^(2+)的电化学检测分析。结果表明,Pb^(2+)能与聚多巴胺表面丰富的功能基团(-OH、-NH2等)发生螯合作用,并被富集于电极表面;通过阳极溶出伏安法,Pb^(2+)会从电极表面再次溶出,从而形成灵敏且具有特异性的电化学信号。通过考察电解质、pH及富集时间等实验参数对Pb^(2+)溶出电流信号强度的影响,进一步优化了该方法对水中Pb^(2+)的检测性能,其检测范围为50~800 nmol/L,理论检测限能够达到32 nmol/L。将其拓展至实际水样中Pb^(2+)的测定,平均回收率可达到95%左右。该简易电极修饰策略能够为便携式环境痕量重金属离子灵敏性检测分析传感器设计提供新的思路。The concentration of heavy metal Pb^(2+)is one of the important monitoring indicators in environmental management and control,and excessive Pb^(2+)in the environment will pose a severe threat both to human health and ecological stability.Herein,a polydopamine coating was successfully modified on the electrode surface by a simple in-situ electro-induced polymerization method,and the electrode was further applied to the electrochemical analysis for the detection of trace Pb^(2+)in water.The results show that Pb^(2+)are easily enriched on the electrode surface through chelation with abundant functional groups(-OH,-NH2,etc.)in the polydopamine surface,and they are redissolved into the aqueous solution from the electrode surface by an anodic stripping voltammetry method.As a result,sensitive and specific electrochemical signals are developed.After analyzing the influences of experimental parameters such as electrolyte,pH value,and enrichment time on the intensity of the electrochemical signals,the study optimized the performance of the proposed method in detecting Pb^(2+)in water,with a detection limit of 32 nmol/L within a detection range of 50~800 nmol/L.Furthermore,the method was applied to detect the Pb^(2+)in actual water samples,with an average recovery rate of about 95%.This simple electrode modification strategy can provide new ideas for designing portable sensitivity sensors to detect and analyze trace heavy metal ions in the environment.

关 键 词：电化学 阳极溶出伏安法 铅离子检测 环境分析 

分 类 号：TQ153.6[化学工程—电化学工业]