Acquiring new methods to achieve the products with lesser molecular weight associated with minimum energy consumption in poly(ethylene terephthalate) (PET) recycling can improve the glycolysis reaction performance. The synergistic effects of gamma irradiation on the properties of PET wastes and heat treatment on the catalytic activity of novel hydrotalcite supported by 2‐wt% Pt/TiO₂ nanoparticles (NPs) were studied. The PET samples treated by different gamma irradiation doses, γ, were degraded by glycolysis, which resulted in an increased yield of bis(2‐hydroxyethyl) terephthalate (BHET) monomer. The XPS analysis showed that the calcination temperature of the catalyst, T, affects the strength of the acid and/or basic sites of catalyst, degradation products, and reaction time. The NH₃‐temperature‐programmed desorption (TPD) analysis showed the interaction between TiO₂ and Pt led to a wide distribution of middle strength acid sites. Processing of PET by gamma irradiation showed that the average molecular weight of degradation products and reaction time decreased by increasing gamma dose. The composition (wt%) analysis indicated that the highest values of yield and selectivity of BHET were achieved in the optimum values of γ = 70 kGy and T = 450°C. The proposed procedure helps to attain minimize the residual oligomers and unreacted species during PET recycling.

中文翻译：

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γ射线辐照PET表面和Pt / TiO2纳米颗粒负载水滑石催化剂热处理对PET解聚速率的协同效应

在聚对苯二甲酸乙二醇酯（PET）回收过程中，采用新的方法获得分子量较小且能耗最低的产品可以改善糖酵解反应性能。研究了γ辐射对PET废料性能和热处理对2-wt％Pt / TiO ₂纳米颗粒（NPs）负载的新型水滑石催化活性的协同作用。通过不同的γ辐照剂量γ处理的PET样品通过糖酵解而降解，这导致对苯二甲酸双（2-羟乙基）酯（BHET）单体的产率提高。XPS分析表明催化剂的煅烧温度T会影响酸的强度和/或催化剂的碱性部位，降解产物和反应时间。NH ₃温度程序解吸（TPD）分析表明TiO ₂和Pt之间的相互作用导致中等强度酸性位点的广泛分布。通过γ射线辐照加工PET显示降解产物的平均分子量和反应时间随γ剂量的增加而降低。组成（wt％）分析表明，在γ＝ 70kGy和T＝ 450℃的最佳值下，BHET的产率和选择性最高。拟议的程序有助于在PET回收过程中使残留的低聚物和未反应的物质最少。