Xu Zihao,Zhang Guoguang,Li Qin*.Study on the detection of copper ion wastewater by electrical analysis technology[J].Plating & Finishing,2024,(6):90-98.[doi:10.3969/j.issn.1001-3849.2024.06.013]
电分析技术用于含铜废水检测研究
- Title:
- Study on the detection of copper ion wastewater by electrical analysis technology
- Keywords:
- metal-organic frameworks ; modified electrode ; heavy metal ions ; electrochemical detection ; stripping voltammetry
- 分类号:
- TQ153.2
- 文献标志码:
- A
- 摘要:
- 工业废水中的 Cu （ II ）离子严重威胁环境和人类健康，因此检测水溶液中 Cu （ II ）离子含量具有重要意义。金属有机框架材料因其比表面积大、可吸附位点多、可设计性强等特点而备受关注。采用溶剂热方法制备了 Ni-MOF 材料，对裸玻碳电极进行 Ni-MOF 材料修饰。用 CV 法和 EIS 法对 Ni-MOF 材料修饰电极的电化学性能进行表征，结果表明修饰后电极的导电性下降，说明导电性较差的 Ni-MOF 材料已经固定在玻碳电极表面。优化了 Ni-MOF 修饰电极对 Cu （ II ）离子进行溶出伏安法的实验参数，优化实验参数为醋酸 - 醋酸钠缓冲溶液做支持电解液，电解液 pH 为 5 ，富集电位为 - 1.2 V ，富集时间为 130 s 。 Ni-MOF 修饰电极对不同浓度的 Cu （ II ）离子检测，溶出峰电流与离子浓度的线性关系为 I （ μ A ） =2.8+1.89 C （ μ M ），灵敏度为 1.89 μ A· μ M -1 ，线性相关系数 R 2 = 0.997 ， 5 次重复检测 Cu （ II ）离子结果表明 Ni-MOF 修饰电极的稳定性较好。
- Abstract:
- ： It is of great significance to detect the content of Cu （ II ） ion in industrial wastewater due to the serious threat of Cu （ II ） ion to the environment and human health. Metal-organic Frameworks （ MOFs ）， featuring large specific surface area ， ample adsorptive sites and high designability ， have received extensive attention as a new kind of porous crystalline materials. The Ni-MOF was prepared by solvothermal method and used as modification material on the naked glassy carbon electrode. The electrochemical properties of Ni-MOF modified electrode were characterized by CV method and EIS method. The results showed a decreased electrical conductivity for Ni-MOF modified electrode ， indicating a successful loading of low conductive Ni-MOF on the surface of the glassy carbon electrode. The experimental optimization of stripping voltammetry for Cu （ II ） ion with Ni-MOF modified electrode were carried out. The experimental conditions were optimized by using acetic acid-sodium acetate buffer solution as the supporting electrolyte at pH=5 with a enrichment potential - 1.2 V for 130 s. When the Ni-MOF modified electrode was used for Cu （ II ） ion detection ， a linear relationship between the peak current and Cu （ II ） ion concentration was obtained to be I （ μ A ） =2.8+1.89 C （ μ M ） with sensitivity of 1.89 μ A· μ M -1 and the linear correlation coefficient R 2 of 0.997. The good performance in the five repeated detection cycles of Cu （ II ） ion indicated a good reproducibility of Ni-MOF modified electrode in Cu （ II ） ion detection.
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备注/Memo
收稿日期： 2023-10-06 修回日期： 2023-11-10 作者简介： 徐子豪（ 1999 —），男，研究生，研究方向：纳米材料制备， email ： 1359829329@qq.com * 通信作者： 李琴 1979 —），女，博士，讲师，研究方向：电化学与表面处理， email ： liqinzijin@126.com 基金项目 ： 南昌航空大学博士启动基金（ EA202101191 ）； 2021 年江西省高等学校教学改革研究课题（ JXJG-21-8-15 ）?/html>