On-off-on fluorescent carbon dots from waste tea: Their properties, antioxidant and selective detection of CrO42-, Fe3+, ascorbic acid and L-cysteine in real samples

被引:128
作者
Chen, Kui [1 ]
Qing, Weixia [2 ]
Hu, Weiping [1 ]
Lu, Minghua [1 ]
Wang, Yong [1 ]
Liu, Xiuhua [1 ,3 ]
机构
[1] Henan Univ, Coll Chem & Chem Engn, Inst Environm & Analyt Sci, Kaifeng 475004, Peoples R China
[2] Henan Univ, Sch Basic Med Sci, Lab Nanomed, Kaifeng 475004, Peoples R China
[3] Henan Univ, Key Lab Nat Med & Immune Engn Henan Prov, Kaifeng 475004, Peoples R China
关键词
On-off-on fluorescent nano-sensor; Carbon dots; Waste tea; Metal ions; Ascorbic acid; L-cysteine; QUANTUM DOTS; GREEN; RECOGNITION; NANOSENSOR; CHROMIUM(VI); NITROGEN; CANCER; YIELD; RED;
D O I
10.1016/j.saa.2019.01.066
中图分类号
O433 [光谱学];
学科分类号
0703 ; 070302 ;
摘要
In this work, we reported an economical plant-based hydrothermal method for one-pot green synthesis of water-soluble carbon dots (Tea-CDs) by usingwaste tea extract as a carbon source. The synthesized Tea-CDs were characterized by UV-visible, fluorescence, FT-IR, TEM, XPS and XRD. The Tea-CDs were found to remove hydroxyl and superoxide anion radical in vitro. In addition, the Tea-CDs exhibited bright blue fluorescence under UV-light (lambda(ex) = 365 nm), and the fluorescence could be effectively quenched by CrO42- and Fe3+ ions. Meanwhile, the fluorescence of Tea-CDs-CrO42- and Tea-CDs-Fe3+ systems could be again easily recovered by ascorbic acid (AA) and L-cysteine (L-Cys). As an on-off-on fluorescent nano-sensor of the Tea-CDs, the sensitive detection of CrO42-, Fe3+, AA and L-Cys were all performed, showing that the good linear relationships between fluorescence intensity of Tea-CDs and concentration of all testing samples. Finally, the sensors successfully detected CrO42-, Fe3+, AA and L-Cys in commercially available real samples with satisfactory recovery ranges. The prepared sensors offer distinct advantages including low cost, simple handling, good sensitivity and high selectivity. (C) 2019 Elsevier B.V. All rights reserved.
引用
收藏
页码:228 / 234
页数:7
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