混合气凝胶负载铋纳米粒子的电化学传感器检测Pb^(2+)和Cd^(2+)  

Electrochmical Sensing Platform for Detection of Lead(Ⅱ) and Cadmium(Ⅱ) Based on Mixed-Aerogels Loaded with Bismuth Nanoparticles

作　　者：张翠忠[1,2] 连欢 杨薇[1] 诸葛文凤 唐小强 郭洋洋 彭金云[1] 李福燕[1] ZHANG Cui-Zhong;LIAN Huan;YANG Wei;ZHUGE Wen-Feng;TANG Xiao-Qiang;GUO Yang-Yang;PENG Jin-Yun;LI Fu-Yan(Photochemical Sensing and Regional Environmental Analysis Laboratory,Chemical and Biological Engineering College,Guangxi Normal University for Nationalities,Chongzuo 532200,China;School of Chemisty and Chemical Engineering,Guangxi University,Nanning 530004,China)

机构地区：[1]广西民族师范学院化学与生物工程学院光电化学传感与区域环境分析实验室,崇左532200 [2]广西大学化学化工学院,南宁530004

出　　处：《分析化学》2022年第8期1233-1242,共10页Chinese Journal of Analytical Chemistry

基　　金：广西高校中青年教师科研能力提升项目(Nos.2021KY0771,2019KY0788,2021KY0768);崇左市科技局项目(No.崇科FA2020019);广西民族师范学院校级项目(Nos.2018YB032,2021YB041,2021YB038)资助。

摘　　要：重金属不可降解且具有毒性,重金属污染严重威胁生态安全和人体健康,因此,建立灵敏、准确的重金属离子检测方法具有重要的意义。本研究以聚多巴胺(PDA)为交联剂,将羧基碳纳米管(MWCNT-COOH)和氧化石墨烯(GO)通过氨基和羧基等基团键合,形成3D分层多孔结构的混合气凝胶(MAs),形貌类似“卷心菜”,并以MAs为基底原位负载铋纳米粒子(BiNPs),构建了检测铅离子(Pb^(2+))和镉离子(Cd^(2+))的电化学传感器。采用微分脉冲溶出伏安法(DPSV)可同时检测Pb^(2+)和Cd^(2+),线性范围分别为5~500 ng/L和0.5~70μg/L,检出限(S/N=3)分别为0.13和0.49 ng/L。本传感器具有较高的准确性、稳定性和抗干扰性,可用于Pb^(2+)和Cd^(2+)的同时检测,在实际环境水样质量监测中具有良好的应用潜力。Heavy metals have the characteristics of low concentration,high toxicity and biological undegradability.The heavy metal ion pollution of environmental water systems pose a great threat to human health.In this work,carboxy carbon nanotubes(MWCNT-COOH)and dialyzed graphene oxide(GO)were bonded to form a 3D mixed-aerogels(MAs)of hierarchical porous structure with polydopamine(PDA)as the“cross-linking agent”,similar to“cabbage-like”.Bismuth nanoparticles(BiNPs)were loaded in situ on MAs as the substrate to construct an electrochemical sensor.Differential pulse stripping voltammetry(DPSV)was used to detect Pb^(2+)and Cd^(2+)simultaneously.The linear ranges were 5-500 ng/L and 0.5-70μg/L,and the corresponding detection limits(S/N=3)were 0.13 ng/L and 0.49 ng/L for Pb^(2+)and Cd^(2+),respectively.The experimental results showed that the sensor had high accuracy,high stability and anti-interference properties.The sensor was expected to be of great significance for simultaneous detection of heavy metals.

关 键 词：混合气凝胶 分层多孔结构 铋纳米粒子 微分脉冲溶出伏安法 铅离子(Ⅱ) 镉离子(Ⅱ) 

分 类 号：O657.1[理学—分析化学] X830.2[理学—化学]