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Fluorescent probe gold nanodots to quick detect Cr(VI) via oxidoreduction quenching process

Science China Chemistry 2019年第1期62卷 133-141页

作者： Yueqi Zhao Yuanqing Sun Yingnan Jiang Shanliang Song Tianxin Zhao Yue Zhao Xinyu Wang Baoquan Li Bai Yang Quan Lin State Key Laboratory of Supramolecular Structure and Material College of Chemistry Jilin University State Key Laboratory of Heavy Oil Processing College of Science China University of PetroleumBeijing Jilin Ginseng Academy Changchun University of Chinese Medicine Department of Oral Pathology School and Hospital of Stomatology Jilin University

A method is described here for the quickly(<30 s) accurate determination of Cr(VI)(Cr_2O_7^(2-)), based on fluorescent probes gold nanodots(AuNDs, excitation/emission peaks at 395/604 nm) coated with glutathione(GSH).... 详细信息

A method is described here for the quickly(fluorescence of the AuNDs responses linearly to Cr(VI) concentrations, ranging widely from 1 nM to 10 m M with detection limit as low as 0.35 nM. At the same time, the AuNDs is demonstrated highly selective for Cr(VI) detection over other acid group ions and metal ions without any masking reagent. These make probability for practical use. The quenching mechanism is investigated deeply via fluorescent lifetime, XPS and TEM analysis. Different from most reported quenching explanation of aggregation derived from charge attraction, these results verify the redox reaction between Cr_2O_7^(2-)and sulfhydryl(–S) of GSH. The Au(I)–S bonds of AuNDs broke, accompanies with the oxidation of –S to form S–S bonds. As a result, AuNDs cross linked to each other. In the end, the fluorescence quenched. Attractively, the present study provides a new strategy for pollutant detection, such as from harmful Cr(VI) of Cr_2O_7^(2-)to nontoxic Cr(III).

关键词： fluorescent probe of Cr(VI) Au nanodots quick and quantitative detection fluorescence quenching mechanism pollutant detection

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