TiO2 Assisted Photocatalytic Decomposition of 2-Chloronaphthalene on Iron Nanoparticles in Aqueous Systems: Synergistic Effect and Intermediate Products
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2-Chloronaphthalene (2-CN), used as an intermediate for organic synthesis, is a new type of persistent organic pollutant. In this work, the decomposition efficiency and decomposition mechanism of 2-CN by zero-valent iron (ZVI) assisted TiO2 photodecomposition were studied in aqueous medium. Under UV light intensity of 38 mW cm–2, the optimal conditions for photodecomposition at an initial concentration of 5 μmol L–1 of 2-CN were pH 3 and 0.04 g L–1 TiO2 and ZVI, as catalysts. Then, the decomposition efficiency of 2-CN reached 66 and 100% in the UV/TiO2 and UV/ZVI/TiO2 systems, respectively. Based on analysis of the primary intermediate products of 2-CN, the chlorine on 2-CN was first replaced by a hydroxyl group to form 2-hydroxynaphthalene, and then the naphthalene ring was opened and gradually demethylated to produce small molecules, such as water and carbon dioxide.
Keywords:2-chloronaphthalene zero-valent iron photodecomposition processes intermediate products photodecomposition mechanism
The authors thank the staff of Key Laboratory of Cleaner Production and Industrial Wastes Recycling and Resourcization in Universities of Shandong, Qilu University of Technology (Shandong Academy of Science). This work was supported by the National Nature Science Foundation of China (no. 21507067).
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