摘要
甲基汞在环境中对生物危害极大,因此迫切需要一种快速高灵敏的检测方法。本文通过将磷掺杂到类石墨相氮化碳(g-C 3 N 4)中,减小了其禁带宽度,提高了其催化活性。采用磷掺杂类石墨相氮化碳(PCN)修饰金电极构建了电化学传感器用于甲基汞(CH_(3)Hg^(+))的测定。在最佳实验条件下,CH_(3)Hg^(+)展示出良好的差分脉冲伏安响应信号,在0-25μg·L^(-1)的浓度范围内,响应峰值电流具有良好的线性关系,计算得到其灵敏度为0.42μA/(μg·L^(-1))和最低检测限为0.182μg·L^(-1)(S/N=3)。此外,通过添加SnCl_(2),消除了无机汞在甲基汞检测中的影响。PCN敏感界面对CH_(3)Hg^(+)的检测在Cu^(2+)、Cd^(2+)、Pb^(2+)、Bi^(3+)和As^(3+)阳离子存在下具有良好抗干扰能力,对传感器稳定性与重现性评估也取得良好效果,实际水样中CH_(3)Hg^(+)的检测达到了94.7%-104.4%的回收率。结果表明,PCN修饰电极对实际水环境中CH_(3)Hg^(+)的测定具有很大的应用潜力。
Methylmercury is extremely harmful to organisms in the environment,so there is an urgent need for a rapid and efficient detection method.By doping phosphorus into graphite carbon nitride(g-C 3 N 4),the band gap was reduced and the catalytic activity was improved.An electrochemical sensor for the determination of methylmercury(CH_(3)Hg^(+))was constructed by using phosphorus doped graphite carbon nitride(PCN)modified gold electrode.Under the optimized experimental conditions,CH_(3)Hg^(+)exhibits a sensitive differential pulse voltammetry response signal.In the concentration range of 0-25μg·L^(-1),the response peak current has a good linear relationship,the sensitivity is 0.42μA/(μg·L^(-1))and the limit of detection is 0.182μg·L^(-1)(S/N=3).In addition,the influence of inorganic mercury in CH_(3)Hg^(+)detection was eliminated by adding SnCl_(2).PCN sensing interface shows that the detection of CH_(3)Hg^(+)by heavy metal ions has good anti-interference ability in the presence of Cu^(2+),Cd^(2+),Pb^(2+),Bi^(3+)and As^(3+).The evaluation of the stability and reproducibility of the sensor also achieved good results,and the detection rate of CH_(3)Hg^(+)in actual water samples reached 94.7%-104.4%.The results show that PCN modified electrode has great potential for the determination of CH_(3)Hg^(+)in actual water environment.
作者
孙晓彤
刘瑶
戴正亮
王贝
黄剑豪
陈星
SUN Xiaotong;LIU Yao;DAI Zhengliang;WANG Bei;HUANG Jianhao;CHEN Xing(School of Resource and Environmental Engineering,Hefei University of Technology,Hefei 230009,China;Anqing Changhong Chemical Co.,Ltd.,Anqing 246002,China)
出处
《聊城大学学报（自然科学版）》
2021年第5期27-36,共10页
Journal of Liaocheng University:Natural Science Edition
基金
国家自然科学基金项目(21777164)
安徽省科技重大专项项目(202003a07020004)资助。
关键词
磷掺杂类石墨相氮化碳
电化学分析检测
带隙调控
甲基汞
P doped graphitic carbon nitride
electrochemical analysis and detection
band gap regulation
methyl mercury
