Abstract：
The waste management of polyethylene terephthalate (PET)-derived polyester (PES) textile is a global issue, and material recovery through chemical recycling can restore a circular economy. In our investigation, microwave-induced catalytic aminolysis and glycolysis of PES textile wastes using Ag-doped ZnO nanoparticles have been proposed. Ag-doped ZnO is prepared by the sol-gel method and characterised by XRD, FT-IR, UV-Vis, SEM-EDX and TEM. The reaction parameters such as PET-to-catalyst ratio, microwave power and irradiation time, temperature and catalyst recycling have been optimised. The catalyst was found to be more stable and could be recycled up to six times without losing its activity. Both the aminolysis and glycolysis of PES showed 100% conversion and afforded of bis (2-hydroxy ethylene) terephthalamide (BHETA) and bis (2-hydroxy ethylene) terephthalate (BHET), respectively. The depolymerisation of PES wastes using Ag-doped ZnO afforded BHETA and BHET for about 95 and 90%, respectively. The monomers BHET and BHETA confirmed by FT-IR, 1H NMR and mass spectroscopy. According to the findings, 2 mol% Ag-doped ZnO has higher catalytic activity.
摘要：
聚对苯二甲酸乙二醇酯(PET)衍生聚酯(PES)纺织品的废物管理是一个全球性的问题,通过化学回收进行材料回收可以恢复循环经济。在我们的调查中,已经提出了使用Ag掺杂的ZnO纳米颗粒对PES纺织废物进行微波诱导的催化氨解和糖酵解。通过溶胶-凝胶法制备了Ag掺杂的ZnO，并通过XRD表征，FT-IR,UV-Vis,SEM-EDX和TEM。反应参数，如PET与催化剂的比例，微波功率和辐照时间，温度和催化剂回收已得到优化。发现该催化剂更稳定并且可以再循环多达6次而不损失其活性。PES的氨解和糖酵解均显示出100％的转化率，并提供了双（2-羟基亚乙基）对苯二甲酰胺（BHETA）和双（2-羟基亚乙基）对苯二甲酸酯（BHET），分别。PES废物的解聚使用Ag掺杂的ZnO提供BHETA和BHET约95％和90％，分别。通过FT-IR确认单体BHET和BHETA，1HNMR和质谱。根据调查结果,2mol%Ag掺杂的ZnO具有较高的催化活性。
