Cao Jingjing, Lin Yuheng, Zhou Tianpeng, Wang Wei, Zhang Quanxing, Pan Bingcai, Jiang Wei
State Key Laboratory of Pollution Control and Resources Reuse, National Engineering Research Center for Organic Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China.
Department of Chemistry and Centre for Pharmacy, University of Bergen, 5007 Bergen, Norway.
iScience. 2023 Jul 27;26(8):107492. doi: 10.1016/j.isci.2023.107492. eCollection 2023 Aug 18.
Polyethylene terephthalate (PET) is the most produced polyester plastic; its waste has a disruptive impact on the environment and ecosystem. Here, we report a catalytic depolymerization of PET into bis(2-hydroxyethyl) terephthalate (BHET) using molecule oxygen (O)assisted in defect-rich ZnO. At air, the PET conversion rate, the BHET yield, and the space-time yield are 3.5, 10.6, and 10.6 times higher than those in nitrogen, respectively. Combining structural characterization with the results of DFT calculations, we conclude that the (100) facet of defect-rich ZnO nanosheets conducive to the formation of reactive oxygen species (∗O) and Zn defect, promotes the PET breakage of the ester bond and thus complete the depolymerization processed. This approach demonstrates a sustainable route for PET depolymerization by molecule-assisted defect engineering.
聚对苯二甲酸乙二酯（PET）是产量最高的聚酯塑料；其废弃物对环境和生态系统具有破坏性影响。在此，我们报道了利用富缺陷的ZnO辅助分子氧（O）将PET催化解聚为对苯二甲酸双（2-羟乙酯）（BHET）的过程。在空气中，PET转化率、BHET产率和时空产率分别比在氮气中高3.5倍、10.6倍和10.6倍。结合结构表征和DFT计算结果，我们得出结论，富缺陷的ZnO纳米片的（100）面有利于活性氧物种（∗O）和Zn缺陷的形成，促进了PET酯键的断裂，从而完成了解聚过程。该方法展示了一种通过分子辅助缺陷工程实现PET解聚的可持续途径。
Zotero 插件
