电分析技术用于含铜废水检测研究
Study on the detection of copper ion wastewater by electrical analysis technology
徐子豪 1张国光 1李琴1
作者信息
- 1. 南昌航空大学 材料科学与工程学院,江西 南昌 330063
- 折叠
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(μA)=2.8+1.89C(μM),灵敏度为1.89 μA·μM-1,线性相关系数R2=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 relation-ship between the peak current and Cu(Ⅱ)ion concentration was obtained to be I(μA)=2.8+1.89C(μM)with sensitivity of 1.89 μA·μM-1 and the linear correlation coefficient R2 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.
关键词
金属有机框架/修饰电极/重金属离子/电化学检测/溶出伏安法Key words
metal-organic frameworks/modified electrode/heavy metal ions/electrochemical detec-tion/stripping voltammetry引用本文复制引用
基金项目
南昌航空大学博士启动基金(EA202101191)
江西省高等学校教学改革研究项目(2021)(JXJG-21-8-15)
出版年
2024
NETL
NSTL
万方数据