Preparation of copper-loaded geopolymer microspheres and their catalytic degradation of bisphenol S
The traditional Fenton reaction has limited its application due to the generation of large amounts of metal-rich sludge during wastewater treatment.In this study,a low-cost,easy-to-recycle and green porous geopolymer microsphere(GM)was obtained by suspension curing method,and the copper-loaded geopolymer microsphere(Cu-GM)was prepared as a carrier by impregnation method as a catalyst for Fenton-like reaction,which catalyzed the degradation of bisphenol S(BPS)in water with H2O2.A series of characterization results,such as SEM,XRD,BET and XPS,showed that that Cu+/2+was stably immobilized on the GM surface.The effects of Cu-GM dosage,H2O2 dosage,BPS concentration and initial pH of the solution on the catalytic degradation were further investigated.The results indicated that under the optimized conditions,the removal of BPS by Cu-GM could reach 99.3%within 480min,and the catalytic degradation process conformed to the first-order reaction kinetics.The free radical burst experiment revealed that·OH and 1O2 were the main active substances in the catalytic degradation process.The bad-cycle experiments showed that Cu-GM had good reusability and great potential for application in removing organic pollutants in water.
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