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首页> 外文期刊>RSC Advances >Selective electrochemical determination of trace level copper using a salicylaldehyde azine/MWCNTs/Nafion modified pyrolytic graphite electrode by the anodic stripping voltammetric method
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Selective electrochemical determination of trace level copper using a salicylaldehyde azine/MWCNTs/Nafion modified pyrolytic graphite electrode by the anodic stripping voltammetric method

机译：阳极溶出伏安法使用水杨醛嗪/ MWCNTs / Nafion修饰的热解石墨电极选择性电化学测定痕量铜

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摘要

A novel Cu2+ electrochemical sensor based on a salicylaldehyde azine/MWCNTs/Nafion-modified pyrolytic graphite electrode was prepared for anodic stripping analysis of Cu2+. Salicylaldehyde azine was synthesized and then used for the selective determination of the heavy metal pollutant Cu2+ due to its azine structure, which gave selective complexing ability toward Cu2+. The use of MWCNTs with their strong adsorption ability could greatly enhance the sensitivity. Nafion, a proton-exchange polymer, was used as the conductive matrix in which the salicylaldehyde azine and MWCNTs could be strongly fixed to the substrate electrode surface. The as-prepared electrochemical sensor showed remarkably enhanced selectivity and sensitivity towards Cu2+. The response current of the sensor was linear with Cu2+ concentration ranging from 5 to 300 nM under 15 min accumulation at open-circuit potential, with a very low detection limitation of about 1 nM. The hybrid functionalized electrode also exhibited good selectivity to avoid the interference of other heavy metal ions like Cd2+, Pb2+ and Hg2+ in the mixture solution together with Cu2+. Real application towards environmental sample analysis confirmed that the modified electrode could be applied for the selective determination of trace levels of Cu2+ in the Yellow River.
机译：制备了基于水杨醛嗪/ MWCNTs / Nafion修饰的热解石墨电极的新型Cu2 +电化学传感器，用于Cu2 +的阳极剥离分析。合成了水杨醛嗪，由于其嗪结构，可用于重金属污染物Cu2 +的选择性测定，从而对Cu2 +具有选择性的络合能力。 MWCNTs具有很强的吸附能力可以大大提高灵敏度。质子交换聚合物Nafion被用作导电基质，其中水杨醛嗪和MWCNT可以牢固地固定在基板电极表面。所制备的电化学传感器显示出对Cu2 +的显着增强的选择性和敏感性。传感器的响应电流与Cu2 +浓度在开路电势下15分钟累积15min时呈线性关系，浓度范围为5至300nM，检测极限非常低，约为1nM。杂化功能化电极还具有良好的选择性，可以避免混合溶液中的其他重金属离子（如Cd2 +，Pb2 +和Hg2 +）与Cu2 +发生干扰。在环境样品分析中的实际应用证实，该修饰电极可用于选择性测定黄河中痕量的Cu2 +。

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