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. 2024 Oct 29;15:9357. doi: 10.1038/s41467-024-53774-5

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© The Author(s) 2024

Open Access This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, which permits any non-commercial use, sharing, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if you modified the licensed material. You do not have permission under this licence to share adapted material derived from this article or parts of it. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by-nc-nd/4.0/.

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Fig. 5 — a Photochromism mechanism and photothermal catalytic processes of polyethylene terephthalate (PET) glycolysis. b PET conversion and bis(2-hydroxyethyl) terephthalate (BHET) yield at various conditions. In thermal and thermal + UV conditions the reactor was placed in an oil bath to keep a temperature of 190 ^oC. The UV light intensity is 0.052 W·cm^‒2. In photothermal, the reactor was irradiation by simulated sunlight (0.52 W·cm^‒2). c The adsorbed model and adsorption energy of ethylene glycol dibenzoate (EGD) on TiO₂-O_v and Fe₁-TiO₂ slabs. Atom key: Ti (light blue), Fe (navy), O (red), C (green), H (white). d, e The calculated Gibbs free energy profiles and the intermediate models of photothermal catalytic PET glycolysis on TiO₂-O_v and Fe₁-TiO₂ slabs. Atom key: Ti (light blue), Fe (navy), O (red), C (green), H (white). f The specific activities of Fe₁-TiO₂ toward various polyesters. Insets are the images of dyed PET lunch boxes (black), PET bottles (blue), and multi-cycled PET flakes (gray). About 20 mg of Fe₁-TiO₂ catalysts, 2 g of ethylene glycol, and 0.5 g of various polyester flakes were added to a sealed quartz reactor with a thermocouple inserted to keep a temperature of 190 ^oC. Source data are provided as a Source Data file.