GNs/6F-S-BI-PAEK复合物膜修饰玻碳电极同时测定重金属离子  

Simultaneous Determination of Heavy Metal Ions with GNs/6F-S-BI-PAEK Composite Film Modified Glassy Carbon Electrode

作　　者：周羽殊 王建黎[2] 习玲玲[3] ZHOU Yu-Shu;WANG Jian-Li;XI Ling-Ling(School of Mathematics and Physics,China University of Geosciences,Wuhan 430074,China;College of Chemical Engineering,Zhejiang University of Technology,Hangzhou 310014,China;Department of Chemistry,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]中国地质大学(武汉)数学与物理学院,武汉430074 [2]浙江工业大学化学工程学院,杭州310014 [3]浙江大学化学系,杭州310058

出　　处：《分析化学》2024年第6期893-900,共8页Chinese Journal of Analytical Chemistry

基　　金：浙江省自然科学基金项目(No.LY14B050003)资助。

摘　　要：采用新型高分子聚合物六氟-磺化咪唑聚芳醚酮(6F-S-BI-PAEK)溶液分散氧化石墨烯纳米片(GNs),制备了GNs/6F-S-BI-PAEK复合物膜修饰玻碳电极(GNs/6F-S-BI-PAEK/GCE)。采用电化学阻抗谱(EIS)和循环伏安(CV)法表征了修饰电极的组装过程及其对Co^(2+)、Pb^(2+)、Cd^(2+)和Zn^(2+)的电催化行为,并对制备条件和测定缓冲溶液的p H值等进行了优化。在最佳实验条件下,采用微分脉冲伏安法(DPV)分别对两组微量重金属离子(Co^(2+)、Pb^(2+)和Cd^(2+)以及Pb^(2+)、Cd^(2+)和Zn^(2+))实现了同时选择性测定,响应线性范围为0.5~60.0μg/L,检出限(S/N=3)为0.5μg/L。实验结果表明,此复合物膜修饰电极对微量重金属离子的电化学响应快速、灵敏,电催化活性高、选择性强,可用于实际水样中3种重金属离子的同时测定,平均回收率在95.0%~105.0%之间,相对标准偏差<3.0%。采用高分子聚合物6F-S-BI-PAEK对GNs进行表面包覆不仅有效避免了GNs团聚,还起到了固载GNs于电极表面及协同选择性富集重金属离子的作用。此修饰电极的制备过程简单,稳定性和重现性好。In this work,a novel GNs/6F-S-BI-PAEK composite film modified glassy carbon electrode(GCE)was fabricated for the simultaneous determination of heavy metals by using polymer 6F-S-BI-PAEK to disperse and functionalize graphene oxide nanosheets(GNs).The prepared GNs/6F-S-BI-PAEK composite film modified electrode was well characterized by electrochemical impedance spectroscopy(EIS)and cyclic voltammetry(CV)techniques.The optimum modification and determination conditions were selected.Differential pulse voltammetry(DPV)experiments were performed for selective and sensitive determination of Co^(2+),Pb^(2+),Cd^(2+)and Zn^(2+).Linear responses in the range of 0.5–60μg/L were obtained with the detection limit of 0.5μg/L.The 6F-S-BI-PAEK polymer film capsuling on the surface of GNS not only effectively prevented the agglomeration between the GNS,but also promoted to form a quite stable GNs/6F-S-BI-PAEK composite film on GCE.Moreover,the functionalized 6F-S-BI-PAEK film could be used to adsorb and enrich heavy ions effectively.The GNs/6F-S-BI-PAEK/GCE showed good reproducibility,stability,and was successfully employed for the accurate determination of Co^(2+),Pb^(2+),Cd^(2+)and Zn^(2+)in spiked lake water samples with satisfactory recoveries.

关 键 词：高分聚合物膜 石墨烯 修饰玻碳电极 重金属离子 微分脉冲伏安法 

分 类 号：X832[环境科学与工程—环境工程] O657.1[理学—分析化学]