Fe_2O_3掺杂FeVO_4光催化剂降解甲基橙研究

Photocatalytic Degradation of Methyl Orange Using Fe_2O_3 Doped FeVO_4 Photocatalyst

采用液相沉淀法制备了Fe2O3掺杂FeVO4光催化剂,采用X-射线衍射仪和扫描电子显微镜对其物相进行表征。在20 W紫外灯(主波长λ=253.7 nm)照射一定质量浓度的甲基橙溶液,研究其对甲基橙溶液光催化脱色效果。研究了甲基橙溶液初始质量浓度、催化剂质量浓度、光照强度及pH对甲基橙溶液脱色的影响。研究结果表明,当ρ(甲基橙)为10mg/L时,ρ((光催化剂)为4g/L,d(光照)为14 cm,甲基橙溶液pH为5时对甲基橙溶液的脱色率达到最高,100min内达82%左右。

The Fe2O3 doped FeVO4 photocatalyst was prepared by liquid-phase precipitation technology and characterized using XRD and SEM. Experiments were carried out using methyl orange （MO） as the pollutant to evaluate the photocatalytic activity of the Fe2O3 doped FeVO4 powder. A UV light with the wavelength of 253.7nm was used as the energy source for the photocatalytie activity experiments. The effects of initial MO concentration, catalyst loading, light intensity and pH value on the degree of photo degradation were investigated. The results show that the optimal conditions for MO photocatalytic decoloration include that p（MO） is 10 mg/L, the p（catalyst） is 4g/L,the space between the light and liquid level is 14cm and the initial pH is 5 ; the decoloration rate can reach to about 82% in 100 minutes.