Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 321, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2020.128498
Keywords
Covalent-organic frameworks; Electrochemical detection; Heavy metal ions; Kenaf stem-derived macroporous carbon
Funding
- National Natural Science Foundation of China [21665012, 21964010, 21765009]
- Ground Plan of Science and Technology Projects of Jiangxi Educational Committee [KJLD14023]
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The indissolubility or poor dissolubility of covalent-organic frameworks (COFs) limits their wide applications. Here, the COFBTLP-1 which were prepared by the aminaldehyde condensation between 1,4-benzenedithiol-2,5-diamino-hydrochloride and 1,3,5-triformylbenzene was controllably grown on kenaf stem-derived macroporous carbon (3D-KSC). Compared with COFBTLP-1 powder, the COFBTLP-1 grown on 3D-KSC avoided their random orientation effectively. The results showed that the amount of COFBTLP-1 could be effectively controlled by adjusting the concentration of monomers and growing time. Each unit of COFBTLP-1 has 12 adsorption sites (6 sulfur atoms and 6 nitrogen atoms) for heavy metal ions (HMIs) and regular holes to facilitate the transfer of HMIs. A large number of adsorption sites of HMIs could identify and captured HMIs selectively, and accordingly Cd2+, Pb-2+,Pb- Cu2+ and Hg2+ could be detected simultaneously by using the COFBTLP-1/3D-KSC electrode. The detection limits for Cd2+, Pb2+, Cu2+ and Hg2+ are 12.3 nM, 11.8 nM, 18.6 nM and 21.4 nM, respectively. The sensitivities are up to 1337.4 mu A/mu M cm(2), 1389.0 mu A/mu M cm(2) and 886.2 mu A/mu M cm(2), 770.0 mu A/mu M cm(2), respectively. The COFBTLP-1/3D-KSC may be also applied in other fields of electroanalytical chemistry.
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