Xia Rui-Ze, Cai Xin, Liang Bo, Dai Hai-Hua, Liu Yang-Zhi, Yang Meng, Chen Shi-Hua, Li Pei-Hua, Huang Xing-Jiu
Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China; Key Laboratory of Environmental Optics and Technology, And Environmental Materials and Pollution Control Laboratory, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China; Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China.
Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China; Key Laboratory of Environmental Optics and Technology, And Environmental Materials and Pollution Control Laboratory, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China.
J Hazard Mater. 2023 Oct 5;459:132104. doi: 10.1016/j.jhazmat.2023.132104. Epub 2023 Jul 20.
The perplexity of double peaks in Pb(II) detections has been a threat to the reliability of Pb(II) electroanalysis results for a long term. For the complexity of electrode interfaces, rare studies were taken on mechanisms of Pb(II) double peaks through interfacial kinetics. In this work, analyses on experimental signals and interfacial simulations were working together to reveal that the generation of Pb(II) double peaks in Pb(II)-Cu(II) systems is the deposition of Pb(II) on Cu deposits occurring in parallel. By applying anode stripping voltammetry and cyclic voltammetry, a parallel deposition reaction was found to influence the shape of Pb(II) peaks, and the existence of the second peak was controlled through the adjustment of experimental conditions. A kinetic model was built to reveal the interference of electroanalysis signals caused by a parallel deposition reaction and simulations based on the model were combined with experiments to illustrate that double peaks of Pb(II) were caused by the parallel deposition on Cu(II) deposits. This work proposes another insight of Pb(II) double peaks from macroscale kinetics and pays more attention on the dynamic procedure of electroanalysis interfaces, which makes the study on environmental electroanalysis interface phenomena more clear and is enlightening to develop efficient electrical methods for pollutant monitoring.
长期以来，铅（II）检测中的双峰现象一直威胁着铅（II）电分析结果的可靠性。由于电极界面的复杂性，通过界面动力学对铅（II）双峰机制的研究很少。在这项工作中，实验信号分析和界面模拟共同揭示了铅（II）-铜（II）体系中铅（II）双峰的产生是铅（II）在铜沉积物上的平行沉积。通过应用阳极溶出伏安法和循环伏安法，发现平行沉积反应会影响铅（II）峰的形状，并且通过调整实验条件可以控制第二个峰的存在。建立了动力学模型以揭示平行沉积反应对电分析信号的干扰，并将基于该模型的模拟与实验相结合，以说明铅（II）的双峰是由在铜（II）沉积物上的平行沉积引起的。这项工作从宏观动力学的角度对铅（II）双峰提出了另一种见解，并更加关注电分析界面的动态过程，这使得对环境电分析界面现象的研究更加清晰，对开发高效的污染物监测电学方法具有启发性。
