GNSs/BiVO_4复合光催化剂的水热合成及光催化性能

Hydrothermal synthesis and photocatalytic property of GNSs/BiVO_4 composites

目的采用水热法合成GNSs/BiVO_4复合光催化剂,考察制备条件,研究其对水中盐酸环丙沙星的光催化降解性能。方法采用单因素实验方法考察合成温度、合成时间、pH值和原料配比对复合材料光催化性能的影响;利用Fourier变换红外光谱(FT-IR)、扫描电子显微镜(SEM)对产物进行表征;以盐酸环丙沙星为目标降解物,分析复合光催化剂在可见光下的光催化活性。结果当溶液pH=5,合成温度150℃,反应时间12 h,GNSs的质量分数为10%时,复合光催化剂的可见光催化活性最高,经60 min的可见光照射,盐酸环丙沙星的降解率达到96%。结论 GNSs的加入有效提高了BiVO_4的可见光催化性能。

Objective To prepare graphene nanosheets/BiVO4（ GNSs/BiVO4） photocatalysts by a hydrothermal process,and to research the preparation conditions and photocatalytic degradation performance in water. Methods The influence of preparation conditions,such as reaction temperature,reaction time,p H and ratio of rawmaterials on the photocatalytic performance were investigated based on the method of single factor experiment. The as-prepared samples were characterized by fourier transform infrared spectroscopy and scanning electron microscopy,respectively. The photocatalytic activity of GNSs/BiVO4 photocatalyst was investigated via the degradation of ciprofloxacin under visible-light irradiation. Results The as-prepared GNSs/BiVO4 under the preparation conditions of pH = 5,12 h,150 ℃,and 10% of GNSs（ in mass） exhibited a superior photocatalytic activity,which the degradation rate of ciprofloxacin reached 96% after visible light irradiation for 60 min. Conclusion The visible-light photocatalytic activity of GNSs/BiVO4 is enhanced effectively in the presence of GNSs.