Currently,photocatalytic materials suffer from low visible light utilization,difficulty in settling after degradation completion,low recovery rate,and high raw material and operating costs.To address the above problems in this study,firstly,different ZnO-TiO2 precursor powders were prepared by mixing method,solid-phase reaction method and sol-gel method.Secondly,ZnO-TiO2 based geopolymer microspheres were prepared by dispersion-suspension-curing method.Finally,their degradation performance on tetracycline hydrochloride was investigated by simulating visible light conditions through xenon lamp.The results showed that the ZnO-TiO2 based geopolymer microspheres prepared by the sol-gel method have the best degradation performance on tetracycline hydrochloride.Under the conditions of pH=5,time 150min and solid-liquid ratio of 1.5 g/L,the degradation efficiency of tetracycline hydrochloride on ZnO-TiO2 based geopolymer microspheres prepared by sol-gel method reach 98.71％,and the degradation efficiency can still reach more than 90％after four times of recycling,and the analysis indicating that hydroxyl radical(·OH)plays a major role in this photocatalytic reaction.
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