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‘Turn‐off’ fluorescence strategy for determination of hexavalent chromium ions based on copper nanoclusters
Author(s) -
Cao Xueling,
Bai Yageng,
Liu Faxian,
Li Fei,
Luo Yanan
Publication year - 2021
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.3942
Subject(s) - fluorescence , detection limit , chemistry , copper , tannic acid , hexavalent chromium , nanoclusters , chromium , quenching (fluorescence) , photochemistry , nuclear chemistry , inorganic chemistry , chromatography , optics , physics , organic chemistry
Cu nanoclusters (CuNCs) capped by tannic acid (TA) (CuNCs@TA) can be used as a highly sensitive fluorescent probe for Cr(VI) detection. Therefore, a fluorescence detection method for Cr(VI) can be established according to the fluorescence quenching of CuNCs@TA that is caused immediately after the addition of Cr(VI). The fluorescence quenching efficiency of CuNCs@TA was linearly correlated with Cr(VI) concentration within the range 0.03–60 μM, and the detection limit for Cr(VI) was 5 nM. This method was demonstrated to be suitable for detecting Cr(VI) in actual water samples. We found that sodium thiosulfate (ST) can redox with Cr(VI) and therefore restore the fluorescence of CuNCs@TA. The mechanism of CuNCs@TA fluorescence quenching and enhancement by Cr(VI) and ST was investigated in detail. The ‘turn‐on’ fluorescent sensor is of practical significance and has broad application prospects.