抗坏血酸
荧光
化学
核化学
抗氧化剂
碳纤维
选择性
检出限
X射线光电子能谱
半胱氨酸
过氧化氢
色谱法
线性范围
材料科学
有机化学
食品科学
化学工程
催化作用
酶
复合材料
工程类
物理
复合数
量子力学
作者
Kui Chen,Weixia Qing,Wei‐Xiao Hu,Minghua Lu,Yong Wang,Liu Xiu-hua
标识
DOI:10.1016/j.saa.2019.01.066
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 using waste 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 (λex = 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.
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