沸石咪唑酯骨架材料-8/多壁碳纳米管电化学传感器灵敏检测镉离子(Ⅱ)和铅离子(Ⅱ)  

Electrochemical Sensor for Sensitive Detection of Cadmium(Ⅱ) and Lead(Ⅱ) Based on Zeolitic Imidazolate Framework-8/Multi-Walled Carbon Nanotubes

作　　者：冯小庚 孙迪 孙婧祎 胡盈 方雯倩 熊英[1] FENG Xiao-Geng;SUN Di;SUN Jing-Yi;HU Ying;FANG Wen-Qian;XIONG Ying(College of Chemistry,Liaoning University,Shenyang 110036,China)

机构地区：[1]辽宁大学化学院,沈阳110036

出　　处：《分析化学》2024年第4期541-549,共9页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金项目(No.22305108);辽宁省自然科学基金项目(No.2022-BS-116);辽宁大学研究生优质课程建设与教学模式综合改革研究项目(No.YJG202302065)资助。

摘　　要：将沸石咪唑酯骨架材料-8(ZIF-8)与多壁碳纳米管(MWCNT)结合,制备得到ZIF-8/MWCNT复合材料,并基于此构建了一种可用于Cd^(2+)和Pb^(2+)同时测定的电化学传感器。MWCNT的引入增强了复合材料的导电性;同时,ZIF-8与MWCNT之间的协同作用使ZIF-8/MWCNT复合材料表现出优异的电催化活性,将ZIF-8/MWCNT复合材料修饰玻碳电极(GCE),能够实现Cd^(2+)和Pb^(2+)的分别和同时检测。在最优实验条件下,基于ZIF-8/MWCNT/GCE的电化学传感器对Cd^(2+)和Pb^(2+)分别检测的线性范围分别为0.03~8.00μmol/L和0.03~6.00μmol/L,检出限分别为0.019和0.035μmol/L(S/N=3);对Cd^(2+)和Pb^(2+)同时检测的线性范围分别为0.03~5.00μmol/L和0.03~5.00μmol/L,检出限分别为0.022和0.048μmol/L(S/N=3)。此传感器具有良好的选择性、重现性和稳定性,将其用于实际河水样品中Cd^(2+)和Pb^(2+)的测定,加标回收率分别为98.1%~104.0%和98.3%~102.2%,表明此传感器适用于实际水样中Cd^(2+)和Pb^(2+)的分析检测。A a novel composite ZIF-8/MWCNT was synthesized by combining zeolitic imidazolate framework-8(ZIF-8) with multi-walled carbon nanotubes(MWCNT).The composite was modified on glassy carbon electrode(GCE) to obtain ZIF-8/MWCNT/GCE,which was served as an effective electrochemical sensor for detection of Pb~(2+) and Cd~(2+).Benefiting from the high electrical conductivity of MWCNT and the synergistic effect between ZIF-8 and MWCNT,ZIF-8/MWCNT showed excellent electrocatalytic activity in individual and simultaneous detection of Cd~(2+) and Pb~(2+).Under the optimized conditions,the linear ranges were 0.03-8.00μmol/L and 0.03-6.00μmol/L with corresponding limits of detection(S/N=3) of 0.019 and 0.035μmol/L for individual detection of Cd~(2+) and Pb~(2+),respectively.Whereas for simultaneous detection of Cd~(2+) and Pb~(2+) in their mixture solutions,the linear ranges were0.03-5.00μmol/L and 0.03-5.00μmol/L with corresponding limits of detection(S/N=3) of 0.022 and0.048μmol/L,respectively.In addition,the sensor exhibited good stability,reproducibility and antiinterference ability.Moreover,the sensor showed good feasibility and accuracy for determination of Cd~(2+) and Pb~(2+) in actual river water samples with spiking recoveries of 98.1%-104.0% and 98.3%-102.2%,respectively.

关 键 词：沸石咪唑酯骨架材料-8 多壁碳纳米管 镉离子(Ⅱ) 铅离子(Ⅱ) 电化学传感器 水样 

分 类 号：O657.1[理学—分析化学] X832[理学—化学]