荧光
检出限
分析化学(期刊)
光漂白
水溶液中的金属离子
水溶液
化学
选择性
量子产额
量子点
自来水
碳纤维
材料科学
光化学
金属
纳米技术
光学
物理化学
复合材料
催化作用
环境工程
有机化学
工程类
生物化学
物理
色谱法
复合数
作者
Yan Zhou,Guoqing Chen,Chaoqun Ma,Jiao Gu,Taiqun Yang,Lei Li,Hui Gao,Yi Xiong,Chun Zhu,Anqi Hu,Xin Li,Weinan Guan,Wei Zhang
标识
DOI:10.1016/j.dyepig.2023.111845
摘要
In this paper, fluorescent carbon dots were prepared by hydrothermal method using 3,5-dihydroxybenzoic acid and l-Arginine as precursors. The synthesized CDs have excitation-dependent emission with emission peaks at 354 nm and 460 nm, corresponding to the optimal excitation wavelengths of 295 nm and 330 nm, respectively. CDs have good dispersion and resistance to photobleaching in aqueous solution, and can maintain stable fluorescence in highly concentrated salt environment. Based on the inner filter effect, Cr(VI) with strong absorption can shield the excitation light of CDs at 295 nm and absorb the emission fluorescence at 354 nm simultaneously. Due to the intermolecular electrostatic interaction, Hg(II) can coordinate with CDs surface groups and cause static quenching, which significantly reduces the fluorescence intensity of CDs emitted at 460 nm. The linear ranges were 0.1–2 μM and 0.4–5 μM for Cr(VI) and Hg(II) detection, respectively, and limits of detection were 0.024 μM and 0.084 μM. Additionally, the probe was successfully applied to tap water and lake water samples. With high sensitivity and spectral selectivity, this sensing strategy realized the detection of two heavy metal ions by a single fluorescent probe, demonstrating its great potential in the field of environmental metal analysis.
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