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Immobilized Deep Eutectic Solvent ChCl–2ZnCl2@ZIF-8 Composite as an Efficient and Reusable Catalyst for the Methanolysis of Poly(lactic Acid)

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Abstract

Polylactic acid (PLA), as a biodegradable plastic, is considered a potential alternative to alleviate the environmental problems caused by the accumulation of petroleum-based plastic wastes. However, PLA is relatively expensive and naturally degrades very slowly. Therefore, compared to disposal, recycling PLA is more conducive to sustainable development. In this study, a novel immobilized deep eutectic solvent (DES) ChCl–2ZnCl2@ZIF-8 was developed and used for the methanolysis of PLA to produce a valuable product methyl lactate (ML). The synthesized heterogeneous catalyst exhibits excellent thermal and chemical stability, as well as excellent catalytic performance. For example, the reaction temperature significantly decreased, the dosage of the catalyst decreased, and the PLA conversion and the ML yield were both improved, reaching 98.2% and 96.3%. After the reaction, the catalyst can be recovered through simple filtration, and reused for five times with negligible loss of catalytic activity. The catalyst was characterized by FT-IR, SEM, BET, TGA and XRD. Based on the experimental results, a possible reaction mechanism of PLA methanolysis was proposed. In addition, the kinetics of the PLA methanolysis catalyzed by ChCl–2ZnCl2@ZIF-8 was examined and the activation energy was obtained. This work mainly provided a way of recovering catalysts and promoted the development of PLA methanolysis into ML.

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Acknowledgements

The authors acknowledge the financial support of the National Natural Science Foundation of China (No. 22271170 and 22178191).

Funding

National Natural Science Foundation of China (Grant Nos. 22271170, 22178191).

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Authors and Affiliations

  1. State Key Laboratory Base of Eco-chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China

    Xiaoxu Zhu, Huimin Zhao, Daoshan Yang & Xiuyan Song

  2. College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao, 266109, China

    Hui Wang

  3. College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China

    Fusheng Liu

Authors
  1. Xiaoxu Zhu
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  2. Huimin Zhao
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  3. Hui Wang
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  4. Daoshan Yang
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  5. Fusheng Liu
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  6. Xiuyan Song
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Contributions

Xiaoxu Zhu and Huimin Zhao were responsible for the experimental operation and data analysis together, and Xiaoxu Zhu also wrote the main manuscript text. Hui Wang provided the experimental plan, while Daoshan Yang and Fusheng Liu provided funding. Xiuyan Song reviewed the project and provided laboratory resources. All authors provided review and supervision.

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Correspondence to Xiuyan Song.

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Zhu, X., Zhao, H., Wang, H. et al. Immobilized Deep Eutectic Solvent ChCl–2ZnCl2@ZIF-8 Composite as an Efficient and Reusable Catalyst for the Methanolysis of Poly(lactic Acid). J Polym Environ (2024). https://doi.org/10.1007/s10924-024-03302-9

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  • DOI: https://doi.org/10.1007/s10924-024-03302-9

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