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The pollution of heavy metals to the ecological environment has always been a subject of great concern. Methods for detecting heavy metal ions include atomic absorption spectroscopy, atomic emission spectroscopy, and inductively coupled plasma mass spectrometry. However, these methods are relatively cumbersome, time consuming, and costly. The electrochemical analysis method is simple, sensitive, and rapid, and it can realize on-line analysis of heavy metals. It is currently one of the most promising and attractive detection methods for heavy metal ions.
Institute of Environmental Science and Technology, Xinjiang Institute of Physical and Chemical Technology, Chinese Academy of Sciences Researchers use high-temperature carbide metal organic framework compounds (MOF) to prepare in-situ doped microporous carbon as a working electrode modification material for electrochemical detection of cadmium ions and lead. ion.
The preparation process of the N-doped microporous carbon is simpler than that of the already reported carbon-doped material, and the modified material has a high conductivity, a high specific surface area (941 m2/g) and a high N content (25 at%). Both doped N and microporous structures can effectively adsorb cadmium ions and lead ions. The electrochemical sensor based on this material can realize the simultaneous detection of cadmium ions and lead ions, and its detection limit for cadmium ions is 0.05 ppb, which is 200 times lower than the drinking water standard published by the World Health Organization (WHO); the lead ion detection limit is 1.5ppb is 1/2 of the WHO standard. In addition, the N in-situ doped microporous carbon material can achieve 90% to 105% recovery of laboratory tap water samples. This study provides references for the detection of heavy metals by in situ heteroatom-doped porous carbon electrode modified materials.
Related research results have been published on Electrochimica Acta. The study was supported by the "100-person plan" of the Chinese Academy of Sciences, the Western Light, the Xinjiang Outstanding Youth Fund, and international cooperation projects.
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