Abstract
Raw coal fly ash (RCFA) was modified by H2SO4 impregnation, and the modified RCFA (ACFA) was then used as a Fenton-like catalyst to treat polymer-flooding wastewater (PW) with microwave (MW) pre-enhancement. The characterisation results revealed that H2SO4 impregnation can damage the surface structure of RCFA, increase its specific surface area, and release active sites, thereby improving its catalytic potential. Under optimal experimental conditions (ACFA loading = 20 g/L, H2O2 dosage = 18 mmol/L, pH = 3, MW pre-enhancement duration = 7 min, and formal treatment duration = 50 min), the removal rate of polyacrylamide (PAM) in PW reached 70.3%. The degradation of PAM followed pseudo-first-order kinetics: lnC0C=0.0290∙t, and the relationship between the reaction rate constant, H2O2, and ACFA was kap,1=4355·e-4724.8T·[ACFA]0.411·[H2O2]0.947. MW pre-enhancement could remarkably enhance the OH generation, while the generation path of OH could be changed by the leaching behaviour of ACFA.
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