Abstract
Cotton was chosen as the carrier for carbon quantum dots. The primary hydroxyl groups in the cotton cellulose were oxidized to carboxyl groups, and the nitrogen-containing carbon quantum dots were bonded to the oxidized cellulose through silane coupling agent KH-560. The obtained cellulose/carbon quantum dot composites (CKHCs) were characterized by FTIR, SED-EDS, XRD and XPS. The results indicated that carbon quantum dots were grafted on cellulose. CKHCs were used as the probes for a fluorescent Hg2+ detection, because Hg2+ could induce fluorescence quenching of carbon quantum dots. The sensing system exhibits excellent sensitivity and selectivity for Hg2+, with detection limits for mercury ions as low as 3 nM. The attachment of carbon quantum dots on cellulose makes the recycle of carbon quantum dots more convenient and improves the utilization of carbon quantum dots. The fit equations of the fluorescence intensity and Hg2+ concentrations for CKHC can test the unknown Hg2+ concentrations in the fluorescence quenching method, in which CKHC can be recycled to test the fluorescence quenching due to Hg2+ introduction.
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This research was supported by the National Nature Science Foundation of China (51462009, 51662011 and 21575100).
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Zou, W., Ma, X. & Zheng, P. Preparation and functional study of cellulose/carbon quantum dot composites. Cellulose 27, 2099–2113 (2020). https://doi.org/10.1007/s10570-019-02926-8
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DOI: https://doi.org/10.1007/s10570-019-02926-8