Recyclable Clay-Supported Heteropolyacid Catalysts for Complete Glycolysis and Aminolysis of Post-consumer PET Beverage Bottles

In this investigation, the use of phosphotungstic acid (PWA) and phosphomolybdic (PMA) as well Zn2+ containing kaolin bentonite explored for chemical recycling post-consumer poly(ethyleneterephthalate) (PET) wastes have been explored. The clay supported catalysts 5wt% metals heteropolyacids (HPAs) synthesized using wet impregnation method. Nitrogen adsorption desorption studies, SEM–EDX mapping, powder XRD, FTIR XPS analysis evaluated effect metal ions HPAs loading on surface area, pore volume, elemental composition crystalline nature. Total area BET increased with a 5 wt% Zn2+, PWA PMA bentonite, while volume diameter remain unchanged. SEM EDAX mapping images showed that crystals are dispersed occupied interlayer spaces support. better compared to kaolin. PET waste water bottles collected from local market used process. aminolysis reaction loaded complete depolymerisation produce 87–98% BHETA. glycolysis above at 180–210 °C yielded 78–90% BHET. When comparing clay, performed in terms heteropolyacid afforded higher yield BHET BHETA because Zn HPA, by XPS. We also examined reusability glycolysis.