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| Synthesis of Novel Fluorescent Organic Porous Polymers and Sensing of Paraquat in Aqueous Solution |
| LI Ying1*, SUN Zhi-jing1, HU Xia1, REN Guo-jie1, SUN Lu1, CHU Shan-shan1, SUN Li-jun2, GONG Wei-tao2* |
1. Dalian Product Quality Inspection and Testing Institute Co., Ltd., Dalian 116021, China
2. School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
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Abstract With the rapid growth of the population, the current society's demand for food is also surging, which simultaneously leads to the excessive use of pesticides such as insecticides and herbicides. Among them, with the circulation of the ecosystem, some pesticides flow into the natural environment, causing serious environmental problems, including air pollution, water pollution, and soil contamination, as well as ecosystem destruction. In addition, long-term exposure to pesticides can also lead to different diseases, such as leukemia, lymphoma, and various cancers, seriously endangering human health. Therefore, the development of efficient residual pesticide detection materials and methods is a pressing problem that needs to be addressed. Although traditional chromatographic and electrochemical analysis methods offer advantages such as high sensitivity and accuracy, there are objective factors, including the expense of instrumentation and complex pretreatment steps, that hinder the realization of rapid and in-situ detection. Fluorescence spectroscopy technology has undergone rapid development in recent years, showing promising prospects in the field of rapid detection. However, there are problems, such as poor stability of small-molecule fluorescent probes and easy photobleaching. Metal-organic framework (MOFs) materials have also been widely attempted in the field of pesticide detection. However, poor chemical stability, particularly in terms ofwater stability, limits their further development and promotion in the field of pesticide detection. Porous organic polymer (POPs) materials are a new type of porous materialcomposed of light elements such as C, H, O, and N connected by stable covalent bonds, and have been widely used in fields such as sensing, catalysis, environmental treatment, and energy. However, the effective fluorescence detection of residual pesticides in the aqueous phase has been rarely reported to date. Therefore, in this paper, we successfully prepared a porous organic polymer TPE-OMe with strong fluorescence emission performance by connecting the tetraphenylethylene unit with aggregation-induced emission (AIE) characteristics and the nitrogen-rich hydrazide unit in an aqueous acetic acid solution system through a simple ultrasonic synthesis method, and studied the fluorescence detection performance of the polymer TPE-OMe for paraquat in the aqueous phase using paraquat pesticide as a model. The research results show that the polymer TPE-OMe has a highly sensitive detection ability for paraquat, with a Stern-Volmer coefficient of 2.82×104 （mol·L-1）-1, and its detection limit can reach 4.84×10-7 mol·L-1.
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Received: 2024-12-12
Accepted: 2025-06-04
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Corresponding Authors:
LI Ying, GONG Wei-tao
E-mail: 819818501@qq.com; wtgong@dlut.edu.cn
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