检出限
荧光
Mercury(编程语言)
量子点
硫脲
碘化物
材料科学
分析化学(期刊)
碳纤维
无机化学
化学
核化学
光化学
纳米技术
色谱法
物理
复合数
复合材料
有机化学
程序设计语言
量子力学
计算机科学
作者
Reza Tabaraki,Negar Sadeghinejad
标识
DOI:10.1016/j.ecoenv.2018.01.059
摘要
A novel, green, facile and dual turn-off/on sensor for detection of Hg2+ and I- was developed based on carbon dots. Carbon dots were synthesized from citric acid, urea, and thiourea by microwave-assisted method. The size of the carbon dots (CDs) was about 10 nm and the synthesized CDs showed a strong emission at 523 nm upon excitation at 416 nm. The fluorescence quantum yield was 19.2%. Mercury (II) quenched the fluorescence of carbon dots. This turn off sensor had linear response for Hg2+ over a concentration range from 0.1 to 20 µM with detection limit as low as 62 nM. The carbon dots/Hg2+ system was also used as a turn on sensor for detection of iodide. Linear concentration range for I- was 0.1-10 µM with detection limit as low as 72 nM. The proposed method showed good sensitivity and selectivity with respect to interference ions. Finally, this system was successfully used for the detection of Hg2+ and I- in tap, river and mineral waters and fish samples.
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