一种基于凝胶石墨烯复合材料的水质Pb^(2+)电化学传感器  

Electrochemical Sensor for Pb ^(2+)Based on Gel-Graphene Composite

作　　者：赵文杰 朱晓璐[1,2] 程浩 ZHAO Wen-jie;ZHU Xiao-lu;CHENG Hao(School of Mechanical and Electrical Engineering,Hohai University,Changzhou 213022,China;Key Laboratory of Special Robot Technology of Jiangsu Province,Changzhou 213022,China)

机构地区：[1]河海大学机电工程学院,常州213022 [2]江苏省特种机器人技术重点实验室,常州213022

出　　处：《当代化工》2020年第12期2646-2650,2655,共6页Contemporary Chemical Industry

基　　金：国家自然科学基金(项目编号:51875170);常州市科技支撑计划(社会发展)项目(项目编号:CE20195037);中央高校基本科研业务费项目(项目编号:B200202225)

摘　　要：Pb^(2+)污染是最严重的水污染问题之一,石墨烯材料具有电子传输率高,对部分外界物质响应灵敏等优势,且还原氧化石墨烯(rGO)可用于侦测Pb^(2+),因而其有望用于构建高灵敏度的Pb^(2+)侦测微系统。提出了一种在海藻酸盐凝胶内分散还原氧化石墨烯微片形成复合材料,并将其用于对微量重金属离子Pb^(2+)样品的集中聚集式吸附并配合微电极进行检测的方法。该方法中,所引入藻酸盐凝胶内含有大量含氧官能团,能增强离子吸附,其与配套的具有2μm电极间隙的微电极系统结合,可实现对水体中微量Pb^(2+)样品的侦测。结果表明:"凝胶石墨烯复合物"检测Pb^(2+)灵敏度达到40~50dB,有利于进行超低浓度的离子检测,检测的最低限达到1×10^(-12)mol·L^(-1),低于大多数情况下超低浓度检测要求的下限。A method for Pb^(2+)detection by dispersing rGO microplates in alginate gel to form a composite material as an aggregated micro-adsorber was proposed,and the composite gel material was used to detect trace Pb^(2+)among microelectrodes.The alginate gel contains a large number of oxygen-containing functional groups which can enhance ions adsorption.In combination with the matched microelectrodes system with a 2μm electrode gap,the detection of Pb^(2+)with ultra-low concentrations can be realized.The results showed that the curves of volt-ampere(Ⅰ-Ⅴ)characteristics measured under different concentrations were obviously distinguished.The sensitivity of this composite material to detect Pb^(2+)was very high(up to 40~50 dB),which was conducive to the detection of ions with ultra-low concentrations.The minimum limitation of detection concentrations was 1×10^(-12 )mol·L^(-1),which was lower than the required inferior limit of ultra-low concentration detection in most applications.

关 键 词：石墨烯 海藻酸钠 Pb^(2+) 电化学 灵敏度 

分 类 号：O657.1[理学—分析化学] X832[理学—化学]