Preparation of Carbon Dots Fluorescent Marker and Its Application in Highly Selective NO2 Detection

WANG Changying, ZHANG Dawei, CHEN Guanji, ZHANG Zhenwei, XIAO Weihong, WANG Bin, CHEN Qidan, YANG Bai

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Chem J Chin Univ ›› 2025, Vol. 46 ›› Issue (6) : 139-145. DOI: 10.7503/cjcu20240519
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Preparation of Carbon Dots Fluorescent Marker and Its Application in Highly Selective NO2 Detection

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Abstract

In this work, the yellow-green carbon dots(λ ex=440 nm) with a fluorescence emission wavelength of 535 nm were prepared by a one-step hydrothermal method using dopamine hydrochloride and o-phenylenediamine as raw materials, and then used as fluorescent marker materials for NO2 detection in water samples after purified and separated. The size of the carbon dots is about 3 nm with good dispersion, excellent salt resistance, stable fluorescence under a broad pH value. However, nitrite contaminants in water sources can cause methemoglobinemia disease and has potential carcinogenic risk. The results of the selectivity of the yellow-green carbon dots prepared to detect common contaminants in water samples showed that the carbon dots had a highly specific response to nitrite, and the detection limit was 0.1166 μg/mL(S/N=3, n=3), which meets the requirements of Chinese national standards for determination of NO2 in drinking water(≤1 μg/mL). The detection range of 0—60 μg/mL fits the Stern-Volmer equation, and the range of 0—10 μg/mL(y=0.02x+0.000876, R 2=0.9868) and 12—60 μg/mL(y=0.011x+0.198, R 2=0.9937) have good linear responses. In addition, the recoveries of three spiked water samples are from 90.8% to 100.8%(RSD=0.03%—0.86%, n=3) for the validation test. The method of the fluorescent carbon dots marker for contaminants developed in this work is fast and simple, low-cost and has greatly potential in trace nitrite analysis and can be an effective supplementary method for the monitoring of drinking water sources quality.

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One-step hydrothermal method / Carbon dots / NO2 / Water quality monitoring

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WANG Changying , ZHANG Dawei , CHEN Guanji , et al . Preparation of Carbon Dots Fluorescent Marker and Its Application in Highly Selective NO2 Detection. Chemical Journal of Chinese Universities. 2025, 46(6): 139-145 https://doi.org/10.7503/cjcu20240519

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Funding

the Scientific Research Platforms and Projects(Special Foundation for the Major Program) of Guangdong Provincial Higher Education, China(2021GCZX010)
the Zhuhai Basic and Applied Basic Research Foundation, China(ZH22017003200015PWC)
the Three Levels of Talent Project of Zhuhai College of Science and Technology, China

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