Graphene Quantum Dot as a Green and Facile Sensor for Free Chlorine in Drinking Water

被引：365

作者：

Dong, Yongqiang

Li, Geli

Zhou, Nana

Wang, Ruixue

Chi, Yuwu ^{[1
]}

Chen, Guonan

机构：

[1] Fuzhou Univ, Minist Educ, Key Lab Anal & Detect Food Safety, Fujian Prov Key Lab Anal & Detect Food Safety, Fuzhou 350108, Fujian, Peoples R China

来源：

ANALYTICAL CHEMISTRY | 2012年 / 84卷 / 19期

基金：

中国国家自然科学基金;

关键词：

DISINFECTION BY-PRODUCTS; HYPOCHLORITE; STEP;

D O I：

10.1021/ac301945z

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Free chlorine was found to be able to destroy the passivated surface of the graphene quantum dots (GQDs) obtained by pyrolyzing citric acid, resulting in significant quenching of their fluorescence (FL) signal. After optimizing some experimental conditions (including response time, concentration of GQDs, and pH value of solution), a green and facile sensing system has been developed for the detection of free residual chlorine in water based on FL quenching of GQDs. The sensing system exhibits many advantages, such as short response time, excellent selectivity, wide linear response range, and high sensitivity. The linear response range of free chlorine (R-2 = 0.992) was from 0.05 to 10 mu M. The detection limit (S/N = 3) was as low as 0.05 mu M, which is much lower than that of the most widely used N-N-diethyl-p-phenylenediamine (DPD) colorimetric method. This sensing system was finally used to detect free residual chlorine in local tap water samples. The result agreed well with that by the DPD colorimetric method, suggesting the potential application of this new, green, sensitive, and facile sensing system in drinking water quality monitoring.

引用

页码：8378 / 8382

页数：5

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