磁性Bi2WO6/SrFe12O19复合材料的制备及光催化性能

Preparation and Photocatalytic Activity of Magnetic Bi 2WO 6/SrFe 12 O 19 Composites

使用水热法制备了Bi2WO6/C@SrFe12O19、Bi2WO6/SrFe12O19磁性复合光催化材料,并采用包括紫外-可见漫反射光谱仪(UV-VisDRS)及磁滞回线等手段对光催化剂进行了表征。在500W卤钨灯可见光反应体系中,以RhB的去除率为评价指标,对催化剂的光催化性能进行了研究。研究结果表明:在光催化活性方面,磁性Bi2WO6/SrFe12O19复合材料高于Bi2WO6/C@SrFe12O19,且明显高于单一的Bi2WO6和SrFe12O19,可见光照射反应3h,RhB的去除率达98.52%。该磁性复合光催化材料具有良好的稳定性和磁分离性能。

Bi2WO6/SrFe12O19and Bi2WO6/C@SrFe12O19 magnetic composites were synthesized by twostep hydrothermal method.The as prepared photocatalysts were characterized by UV-visible diffuse-reflectance spectrum (UV-Vis DRS)and magnet hysteresis loop measurement.In the visible reaction system of 500 W halogen tungsten lamp,the photocatalytic activities were evaluated by the degradation of rhodamine B (RhB).As a result,compared with Bi2WO6,SrFe12O19and Bi2WO6/C@SrFe12O19,the Bi2WO6/SrFe12O19composites exhibited significantly enhanced photocatalytic activity for rhodamine B (RhB)degradation under visible light irradiation.The corresponding photodegradation efficiency for rhodamine B is 98.52%after 3hirradiation.In addition,The Bi2WO6/SrFe12O19 composites also have a good stability and can be easily separated from solution by an external magnet.