摘要
采用化学沉淀法制备了不同配比的SiC/BiVO_4复合材料,研究了在白炽灯照射下复合材料对亚甲基蓝的光催化降解性能.结果表明:2∶1型SiC/BiVO_4复合材料的光催化降解能力最强,光照60min时亚甲基蓝的降解率达90%;光降解反应速率常数为0.023 1/min,是纯SiC的22倍.采用X-射线衍射(XRD)、扫描电子显微镜(SEM)和紫外可见-漫反射光谱(UV-Vis DRS)表征了SiC/BiVO_4复合材料的结构和形貌特征,初步分析了亚甲基蓝的光催化降解机理.
This paper reports the results of the photocatalytic degradation efficiency of methylene blueunder filament lamp irradiation using a composite catalyst of SiC/BiVO 4 with different mass ratios. It was found that the SiC/BiVO4heterostructure with the ratio of 2∶1 exhibited the best photocatalytic degradation efficiency reaching up to 90% for 60 min irradiation, and the photo-degradationrate constant was determined to be 0.02305 min -1 , which is 22 times higher than that of pure SiC. Meanwhile, the good distribution of BiVO 4, strong light absorption and low carrier recombination were observed in the heterostructure by scanning electron microscope （SEM） and UV-Vis diffuse reflectance spectroscopy （UV-Vis DRS）. The results demonstrate that SiC and BiVO 4 have appropriate band-edges in forming an efficient heterojunction, which benefits for the enhanced photocatalytic degradation performance and will prove to be helpful in designing new photocatalytic systems.
作者
杨静静
韦莹莹
何勇平
江志勇
韩玉花
张静
杨兵
YANG Jing-jing 1,WEI Ying-ying 1,HE Yong-ping 2,JIANG Zhi-yong 1,HAN Yu-hua 1,ZHANG Jing 1,YANG Bing 1(1. Department of Environmental and Quality Inspection, Chongqing Chemical Industry Vocational College, Chongqing 401228, China;2. Chongqing Petroleum Co., Ltd., China National Aviation Fuel, Chongqing 401120, Chin)
出处
《西南师范大学学报（自然科学版）》
CAS
北大核心
2018年第5期31-36,共6页
Journal of Southwest China Normal University(Natural Science Edition)
基金
重庆市教委科研项目(KJ1504401)
