摘要
目的:制备新型电化学传感器检测食品中的重金属含量。方法:通过水热法,以1,3,5-苯三甲酸(H_(3)BTC)为配体,辅以五水合硝酸铋[Bi(NO_(3))_(3)·5H_(2)O]和六水合硝酸钴[Co(NO_(3))_(2)·6H_(2)O]金属盐,制备新型铋基金属有机骨架;通过超声自组装方式,制备多壁碳纳米管负载的铋基金属有机骨架复合材料(Bi-Co-BTC/MWCNTs);通过滴铸成膜方法,将复合材料修饰至玻碳电极(GCE)表面。结果:采用Bi-Co-BTC/MWCNTs/GCE作为工作电极实现了对样品中的Zn^(2+)、Cd^(2+)、Pb^(2+)同时检测,其检出限分别为0.0403,0.00569,0.0239 ng/mL。三者在茶叶中的加标回收率分别为97.21%~105.44%,92.22%~106.10%,93.97%~98.02%。结论:Bi-Co-BTC/MWCNTs/GCE可用于食品中的重金属含量检测。
Objective:This study focused on the preparation of a new electrochemical sensor for detection of heavy metal content in food.Methods:In this study,a new type of bismuth-based metal-organic framework was prepared by hydrothermal method.1,3,5-benzenetricarboxylic acid(H_(3)BTC)was used as a ligand,which supplemented by bismuth nitrate pentahydrate[Bi(NO_(3))_(35)H_(2)O]and cobalt nitrate hexahydrate[Co(NO_(3))_(2)·6H_(2)O]metal salts to prepare novel bismuth-based metal-organic frameworks.Bi-based metal-organic framework composites supported by multi-walled carbon nanotubes were prepared by ultrasonic self-assembly.The surface of glassy carbon electrode(GCE)was modified by dropping casting.Results:The Bi-Co-BTC/MWCNTs/GCE was used as the working electrode to realize the simultaneous detection of Zn^(2+),Cd^(2+),and Pb^(2+)in the sample,and the detection limits were 0.0403,0.00569,0.0239 ng/mL respectively.The recovery of Zn^(2+),Cd^(2+)and Pb^(2+)in the tea were 97.21%~105.44%,92.22%~106.10%and 93.97%~98.02%,respectively.Conclusion:The results show that Bi-MOF/MWCNTs/GCE can be used to detect the content of heavy metals in food.
作者
丁可武
代莉莉
黄迪惠
孙仲伟
叶瑞洪
DING Kewu;DAI Lili;HUANG Dihui;SUN Zhongwei;YE Ruihong(Fujian Polytechnic Normal University,Fujian Province-Indonesia Marine Food Joint Research and Development Center,Fuzhou,Fujian 350300,China;Fujian Provincial Key Lab of Coastal Basin Environment,Fuzhou,Fujian 350300,China;Wuhan University,Core Facility,Wuhan,Hubei 430072,China)
出处
《食品与机械》
CSCD
北大核心
2023年第9期50-56,共7页
Food and Machinery
基金
福建省科技厅自然科学基金(编号:2020J01310,2022J01977)
福建省高校重点实验室开放课题(编号:S1-KF2014)。
关键词
铋金属有机骨架
多壁碳纳米管
电化学传感器
重金属
茶叶
bismuth metal-organic framework
multi-walled carbon nanotubes
electrochemical sensor
heavy metal
tea
