石油化工高等学校学报 ›› 2022, Vol. 35 ›› Issue (6): 74-80.DOI: 10.3969/j.issn.1006-396X.2022.06.009

• 研究与开发 • 上一篇    

聚多巴胺修饰电极用于水中痕量Pb2+的测定

孙文博1(), 姜一洁1, 李佳男2, 彭冲3()   

  1. 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
  • 收稿日期:2022-05-03 修回日期:2022-08-12 出版日期:2022-12-25 发布日期:2023-01-07
  • 通讯作者: 彭冲
  • 作者简介:孙文博(1988⁃),男,博士,讲师,从事环境污染控制、环境催化等方面的研究;E⁃mail:wenbosun@sdut.edu.cn
  • 基金资助:
    国家自然科学基金项目(22006039);山东省自然科学基金项目(ZR2020QB141);上海市自然科学基金项目(21ZR1425700)

Detection of Trace Pb2+ in Water by Polydopamine⁃Modified Electrodes

Wenbo Sun1(), Yijie Jiang1, Jianan Li2, Chong Peng3()   

  1. 1.School of Resources and Environmental Engineering,Shandong University of Technology,Zibo Shandong 255000,China
    2.School of Resources and Environmental Engineering,East China University of Science and Technology,Shanghai 200237,China
    3.School of Sensing Science and Engineering,Shanghai Jiaotong University,Shanghai 200240
  • Received:2022-05-03 Revised:2022-08-12 Published:2022-12-25 Online:2023-01-07
  • Contact: Chong Peng

摘要:

环境中Pb2+的浓度是环保管控领域重要的监测指标之一,过量Pb2+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Pb2+的电化学检测分析。结果表明,Pb2+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,Pb2+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Pb2+溶出电流信号强度的影响,进一步优化了该方法对水中Pb2+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Pb2+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。

关键词: 电化学, 阳极溶出伏安法, 铅离子检测, 环境分析

Abstract:

The concentration of heavy metal Pb2+ is one of the important monitoring indicators in environmental management and control,and excessive Pb2+ 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 Pb2+ in water.The results show that Pb2+ 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 Pb2+ 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 Pb2+ 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.

Key words: Electrochemical, Anodic stripping voltammetry method, Pb2+ detection, Environmental analysis

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引用本文

孙文博, 姜一洁, 李佳男, 彭冲. 聚多巴胺修饰电极用于水中痕量Pb2+的测定[J]. 石油化工高等学校学报, 2022, 35(6): 74-80.

Wenbo Sun, Yijie Jiang, Jianan Li, Chong Peng. Detection of Trace Pb2+ in Water by Polydopamine⁃Modified Electrodes[J]. Journal of Petrochemical Universities, 2022, 35(6): 74-80.

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