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引用次数: 0
摘要
重金属离子和亚硝酸盐污染食品对人类健康构成严重威胁。因此，迫切需要开发快速灵敏的平台来检测这些污染物。本研究开发了一种新型传感平台，将热解废弃掩膜产生的碳纳米管（WMCNTs）与 ZIF-8 集成，用于同时检测 Cd2+、Pb2+ 和亚硝酸盐。具体来说，WMCNT 主干的电子结构是通过掺杂 B 原子和 N 原子来调节的。然后在其表面原位生长出纳米多孔 ZIF-8，从而制备出具有更强导电性和更大比表面积的复合材料。这种改性为重金属离子和亚硝酸盐的附着提供了更多的活性位点。在优化条件下，该传感平台的线性范围很宽，Pb2+、Cd2+ 和 NO2- 的检测限分别为 2.68、12.12 和 5.94 μM。值得注意的是，该传感平台具有出色的抗干扰能力，能有效检测腌制食品中的亚硝酸盐和重金属离子。 图摘
Upcycling of waste masks into carbon nanotubes combined with ZIF-8 for the detection of heavy-metal ions and nitrite
Food contamination with heavy-metal ions and nitrites poses a serious threat to human health. Consequently, the development of fast and sensitive platforms for detecting these contaminants is urgently needed. In this study, a novel sensing platform was developed by integrating carbon nanotubes generated by the pyrolysis of waste masks (WMCNTs) with ZIF-8 for the simultaneous detection of Cd2+, Pb2+, and nitrite. Specifically, the electronic structure of the WMCNT backbone was modulated by doping with B and N atoms. Nanoporous ZIF-8 was then grown in-situ on its surface to produce composites with enhanced electrical conductivities and large specific surface areas. This modification provided more active sites for the attachment of heavy-metal ions and nitrites. Under optimized conditions, the sensing platform exhibited a wide linear range with the Pb2+, Cd2+, and NO2− limits of detection of 2.68, 12.12, and 5.94 μM, respectively. Notably, the sensing platform demonstrated excellent anti-interference capabilities and effectively detected nitrites and heavy-metal ions in pickled foods.
期刊介绍：
Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.
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