摘要
采用水热法和浸渍法制备复合催化剂CuO/BiVO4。利用紫外-可见漫反射光谱(UV-Vis-DRS)和电化学测试手段对样品进行表征。UV-Vis-DRS表征表明,CuO的负载几乎不改变BiVO4的可见光吸收范围;线性扫描伏安法(LSV)和塔菲尔(Tafel)电化学表征说明复合催化剂中异质结的形成促进了光生电子-空穴的分离,提高了催化剂的光催化活性。通过考察CuO负载对该样品在可见光下光催化矿化甲苯效果的影响,结果显示Cu含量为4.0 wt%时BiVO4矿化甲苯效果最佳,光催化降解308 mg/m3的甲苯6 h后,最高矿化率由纯BiVO4的4.1%提高到19.5%。
CuO/BiVO4 coupled semiconductor was prepared by hydrothermal method and impregnation method. The samples were characterized by UV-Vis diffuse reflectance spectroscopy （UV-Vis-DRS） and electrochemical technology. UV-Vis-DRS characterization revealed that loading CuO on BiVO4 almost did not change the absorption range. Linear sweep vohammetry （LSV） and Tafel characterization revealed that the formation of heterojunction induced the separation of electron and hole, which improved the photocatalytic activity of the samples. Photocatalytic mineralization of toluene using BiVO4 was investigated for different CuO loadings. The results showed that BiVO4 loaded with 4.0 wt% of Cu exhibited optimal visible-light photocatalytic mineralization ability. After 6 h, the mineralization of toluene at initial concentration of 308 mg/m3 was enhanced from 4.1% with pure BiVO4 to 19.5%.
出处
《能源环境保护》
2014年第4期38-41,37,共5页
Energy Environmental Protection
