Chemical Recycling of Polystyrene to Valuable Chemicals via Selective Acid-Catalyzed Aerobic Oxidation under Visible Light
| Autor: | Zhiliang Huang, Muralidharan Shanmugam, Zhao Liu, Adam Brookfield, Elliot L. Bennett, Renpeng Guan, David E. Vega Herrera, Jose A. Lopez-Sanchez, Anna G. Slater, Eric J. L. McInnes, Xiaotian Qi, Jianliang Xiao |
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| Rok vydání: | 2022 |
| Předmět: |
Photosensitizing Agents
Light Singlet Oxygen Singlet Oxygen/chemistry General Chemistry Photosensitizing Agents/chemistry ResearchInstitutes_Networks_Beacons/manchester_institute_of_biotechnology Biochemistry Catalysis Colloid and Surface Chemistry Manchester Institute of Biotechnology Polystyrenes Oxidation-Reduction |
| Zdroj: | JOURNAL OF THE AMERICAN CHEMICAL SOCIETY Huang, Z, Shanmugam, M, Liu, Z, Brookfield, A, Bennett, E L, Guan, R, Vega Herrera, D E, Lopez-Sanchez, J A & Slater, A G 2022, ' Chemical Recycling of Polystyrene to Valuable Chemicals via Selective Acid-Catalyzed Aerobic Oxidation under Visible Light ', J. Am. Chem. Soc., vol. 144, no. 14, 144, pp. 6532-6542 . https://doi.org/10.1021/jacs.2c01410 |
| ISSN: | 1520-5126 |
| DOI: | 10.1021/jacs.2c01410 |
| Popis: | Chemical recycling is one of the most promising technologies that could contribute to circular economy targets by providing solutions to plastic waste; however, it is still at an early stage of development. In this work, we describe the first light-driven, acid-catalyzed protocol for chemical recycling of polystyrene waste to valuable chemicals under 1 bar of O2. Requiring no photosensitizers and only mild reaction conditions, the protocol is operationally simple and has also been demonstrated in a flow system. Electron paramagnetic resonance (EPR) investigations and density functional theory (DFT) calculations indicate that singlet oxygen is involved as the reactive oxygen species in this degradation process, which abstracts a hydrogen atom from a tertiary C–H bond, leading to hydroperoxidation and subsequent C–C bond cracking events via a radical process. Notably, our study indicates that an adduct of polystyrene and an acid catalyst might be formed in situ, which could act as a photosensitizer to initiate the formation of singlet oxygen. In addition, the oxidized polystyrene polymer may play a role in the production of singlet oxygen under light. |
| Databáze: | OpenAIRE |
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