SiC/BiVO_4复合材料光催化降解亚甲基蓝

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.

On Photocatalytic Degradation of Methylene Blueby SiC/BiVO4 Composite

This paper reports the results of the photocatalytic degradation efficiency of methylene blueunder filament lamp irradiation using a composite catalyst of SiC/BiVO₄ with different mass ratios. It was found that the SiC/BiVO4 heterostructure 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 BiVO₄, 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 BiVO₄ 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.