Journal
MICROCHEMICAL JOURNAL
Volume 154, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.microc.2019.104588
Keywords
Tea leaf residue; Carbon dots; Fluorescence quench; Gefitinib
Categories
Funding
- Open Fund of Key Laboratory for Deep Processing of Major Grain and Oil (Wuhan Polytechnic University), Ministry of Education [2018JYBQGDKFA02]
- Fundamental Research Funds for the Central Universities [2017KFYXJJ149]
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The green tea leaf residue was used as the carbon source to produce carbon dots (named as T-CDs) by combining pyrolyzation at high temperature and oxidation by concentrated H2SO4. Owing to the co-doping of S and N, T-CDs possessed high fluorescence quantum yield up to 14.8%. The fluorescence of the T-CDs was stable to the environmental pH, ionic strength and ultraviolet radiation, but sensitive to temperature with switchable intensity between 15 degrees C and 65 degrees C. The fluorescence of T-CDs was also found to be quenched by gefitinib via the inner-filter effect. Thus, T-CDs were used as the fluorescence sensor for gefitinib determination with good linearity in the range of 0.1 mu g/mL to 20 mu g/mL with satisfactory accuracy. The proposed T-CDs were obtained based on waste recycling of tea leaf residue for sustainability, and this strategy widened the applications of CDs.
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