Efektyvus PAH ir PCB skaidymas sąvartyno filtrate fotofentonu, naudojant iš perdirbto PET susintetintą Fe-CoBDC@Fe3O4 katalizatorių

Anotacija

Landfill leachate is highly challenging to treat due to its complex and unstable composition, containing high concentrations of ammonia nitrogen, chemical oxygen demand (COD), heavy metals, and persistent organic pollutants such as polyaromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs). In this study, a novel heterogeneous photo-Fenton catalyst, Fe-CoBDC@Fe3O4, was synthesised via a thermosolvent method using terephthalic acid regenerated from PET waste. The catalyst was employed for the degradation of recalcitrant compounds in leachate following pretreatment with an activated solid reactor. Upon UV irradiation (240 nm), the Fe-CoBDC@Fe3O4 catalyst generates electron–hole pairs, where the holes (h+) oxidise water or hydroxyl ions (OH-) to form hydroxyl radicals (•OH), which in turn degrade organic pollutants. Optimal treatment conditions were identified as a catalyst dosage of 1 g/L, H2O2 dosage of 0.8 mL, pH 3.0, and a reaction time of 30 min. Under these conditions, the removal efficiency of 97% for COD, 85% for PAHs and 84% for PCBs was achieved. These results demonstrate that Fe-CoBDC@Fe3O4 is a highly effective and sustainable photo-Fenton catalyst for the treatment of refractory compounds in industrial leachate.