Preparation of ZnO-TiO2 based geopolymer microspheres and degradation performance of tetracycline hydrochloride
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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