Preparation of fluorescent carbon quantum dots and application for Cu2+ detection
1. School of Environment and Safety Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. School of Pharmacy, Jiangsu University, Zhenjiang, Jiangsu 212013, China
Abstract:To detect copper ions (Cu2+) sensitively, the red fluorescent carbon quantum dots were rapidly synthesized with chloroform and diethylamine as precursors by the mild one-pot synthesis method, and the morphology, structure, composition and optical properties of the carbon quantum dots were characterized. The mechanism of fluorescence quenching of carbon quantum dots by copper ions was investigated by the coordination of copper ions with EDTA. To better explore the influence of conditions on Cu2+ extinct carbon quantum dots fluorescence, the pH, ionic strength, response time were respectively optimized. The results show that the carbon quantum dots have good water solubility and uniform particle size, and the fluorescence intensity can be quenched by copper ions obviously. Fluorescence signal can accurately detect Cu2+ with wide linear range from 0.01 to 150.00 μmol·L-1 and low detection limit of 3.4 nmol·L-1. Under the optimal experiment conditions, the actual sample spike recovery rate is from 90% to 110%, which indicates that the method can be used for actual water sample detection.
VZQUEZ-GONZLEZ M, LIAO W C, CAZELLES R, et al. Mimicking horseradish peroxidase functions using Cu2+-modified carbon nitride nanoparticles or Cu2+-modified carbon dots as heterogeneous catalysts\[J\]. ACS Nano, 2017, 11(3):3247-3253.
ZHOU Y, JIN X Y, ZHANG X F,et al. Rahnella sp.LRP3 induces basic zinc phosphate precipitation and its role in zinc contaminated soil remediation\[J\]. Journal of Jilin University(Science Edition), 2019, 57(3):722-727. (in Chinese)
[3]
HAN Y Y, DING C Q, ZHOU J, et al. Single probe for imaging and biosensing of pH, Cu2+ ions, and pH/Cu2+ in live cells with ratiometric fluorescence signals\[J\]. Analytical Chemistry, 2015, 87(10):5333-5339.
[4]
LIU X J, ZHANG N, BING T, et al. Carbon dots based dual-emission silica nanoparticles as a ratiometric nanosensor for Cu2+ \[J\]. Analytical Chemistry, 2014, 86(5): 2289-2296.
[5]
WU Y, TAN Y, WU J T, et al. Fluorescence array-based sensing of metal ions using conjugated polyelectrolytes\[J\]. ACS Applied Materials and Interfaces, 2015, 7(12): 6882-6888.
NIU J Y, XIE Y, WANG L Y,et al. Study on the synthesis and photocatalytic applications of graphitic carbon nitride with high surface area\[J\]. Journal of Sichuan University (Natural Science Edition), 2018, 55(5):1067-1077. (in Chinese)
[7]
WANG Y F, HU A G. Carbon quantum dots: synthesis, properties and applications\[J\]. Journal of Materials Chemistry C, 2014, 2(34):6921-6939.
[8]
KOZK O, DATTA K K R, GREPLOV M, et al. Surfactant-derived amphiphilic carbon dots with tunable photoluminescence\[J\]. Journal of Physical Chemistry C, 2013, 117(47): 24991-24996.
[9]
NIE H, LI M J, LI Q S, et al. Carbon dots with conti-nuously tunable full-color emission and their application in ratiometric pH sensing\[J\]. Chemistry of Materials, 2014, 26(10):3104-3112.
[10]
RUSS ALGAR W, MASSEY M, KRULL U J. The application of quantum dots, gold nanoparticles and mole-cular switches to optical nucleic-acid diagnostics\[J\]. Trends in Analytical Chemistry, 2009, 28(3):292-306.