Transformative Removal of Aqueous Micropollutants into Polymeric Products by Advanced Oxidation Processes
Date
2024
Authors
Chen, Y.
Ren, W.
Ma, T.
Ren, N.
Wang, S.
Duan, X.
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Journal article
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Environmental Science and Technology, 2024; 58(11):4844-4851
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Yidi Chen, Wei Ren, Tianyi Ma, Nanqi Ren, Shaobin Wang, and Xiaoguang Duan
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Abstract
This perspective presents the latest advancements in selective polymerization pathways in advanced oxidation processes (AOPs) for removal of featured organic pollutants in wastewater. In radical-based homogeneous reactions, SO4•--based systems exhibit superior oxidative activity toward aromatics with electron-donating substituents via single electron transfer and radical adduct formation (RAF). The produced organic radical cations subsequently undergo coupling and polymerization reactions to produce polymers. For •OH-based oxidation, metal ions facilitate the production of monomer radicals via RAF. Additionally, heterogeneous catalysts can mediate both coupling and polymerization reactions via persulfate activation without generating inorganic radicals. Metal-based catalysts will mediate a direct oxidation pathway toward polymerization. In contrast, carbon-based catalysts will induce coupling reactions to produce low-molecular-weight oligomers (≤4 units) via an electron transfer process. In comparison to mineralization, polymerization pathways remarkably reduce peroxide usage, quickly separate pollutants from the aqueous phase, and generate polymeric byproducts. Thus, AOP-driven polymerization systems hold significant promise in reducing carbon emission and realizing carbon recycling in water treatment processes.
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© 2024 American Chemical Society