期刊
WASTE MANAGEMENT
卷 120, 期 -, 页码 642-649出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2020.10.031
关键词
Chlorite; Clinochlore; Hydrolysis; Plastics chemical recycling; Poly-[bisphenol A carbonate]; Waste valorization
资金
- Laboratorio per lo Sviluppo Integrato delle Scienze e delle TEcnologie dei Materiali Avanzati e per dispositivi innovativi (SISTEMA) [PONa3_00369]
- Universita degli Studi di Bari (Fondi di Ateneo)
This study investigates the use of natural clay mineral as a catalyst for the chemical valorization of poly-[bisphenol A carbonate] wastes. It was found that the mineral promoted depolymerization of the waste material effectively and achieved selective regeneration of the monomer. Factors such as temperature, catalyst loading, and H2O/PC weight ratio significantly influenced the productivity of the process.
The present study describes the first example of utilization of a natural clay mineral as catalyst in a process addressed to chemical valorization of poly-[bisphenol A carbonate] (PC; (1)) wastes. A natural clinochlore was investigated for the first time as the catalyst of the hydrolysis reaction of 1, a potential route to chemical recycling of wastes of this polymeric material. At 473 K, in tetrahydrofuran (THF) as the solvent, the mineral promoted effectively the depolymerization (up to 99%, after 6 h) of 1 by H2O and the selective (similar to 99%) regeneration of the monomer bisphenol A (BPA, (2)). Temperature, catalyst loading, reaction time, H2O/PC weight ratio affected markedly the productivity of the process. The role of the catalyst was also focused: the experimental data showed that the exposed brucite-like sheets of clinochlore are involved in the hydrolysis reaction and take active part in promoting the depolymerization process. (C) 2020 Elsevier Ltd. All rights reserved.
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