Journal
CARBOHYDRATE POLYMERS
Volume 249, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2020.116882
Keywords
Carboxymethyl cellulose; Sulfur quantum dots; Cell imaging; Inner filter effect; Cr(VI); Ascorbic acid
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Funding
- National Natural Science Foundation of China [51663007]
- Natural Science Foundation of Guangxi Province [2017GXNSFFA198002]
- Bagui Scholar Program of Guangxi Province
- Project of Thousand Outstanding Young Teachers' Training in Higher Education Institutions of Guangxi
- Open Research Fund of Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional Materials
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Nowadays the synthesis of stable fluorescent sulfur quantum dots (SQDs) remains a big challenge. Herein, the utilization of carboxymethyl cellulose (CMC) to synthesis of SQDs is reported. Benefiting from the unique composition and structure of CMC macromolecule, the resulted CMC-SQDs simultaneously show high aqueous dispersibility and stability, tunable emission, stable fluorescence and low cytotoxicity, which make them promising for working as a fluorescent probe. Fluorescence detection experiments suggested that the CMC-SQDs could serve as a fluorescence on-off-on switch to sensitive and selective detection of Cr(VI) and ascorbic acid (AA) based on the inner filter effect (IFE). The limit of detection towards Cr(VI) and AA can reach 0.024 and 0.18 mu M with linear range of 0.5-225 and 1-300 mu M, respectively, which compares favorably to other reported fluorescent probes. In addition, the employment of fluorescent CMC-SQDs for practical detection of Cr(VI) and AA was also studied.
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