掺铁纳米氧化锌的制备及其光催化性能

Preparation and Photocatalysis Properties of ZnO and Fe-doped ZnO

采用共沉淀法制备了纯纳米ZnO和掺铁纳米ZnO,并用X射线衍射光谱进行了表征。用紫外灯作为光源,甲基橙溶液为光催化反应模型降解物,研究了ZnO及掺铁ZnO的光催化性能,并考察了前驱体焙烧温度、铁掺杂量、底物浓度、光照时间以及pH对降解率的影响。结果表明,掺杂铁离子提高了ZnO的光催化活性,400℃热处理的掺杂铁0.5%(质量比)的ZnO的光催化性能最好;当甲基橙初始浓度为5mg/L,光照时间3h,掺杂铁0.5%(质量比)的ZnO粉末对甲基橙的降解率达到84%;掺铁纳米ZnO在弱酸性条件下的催化效果比碱性条件下更好。

Pure ZnO and different Fe-doped ZnO nanoparticles were prepared by direct precipitation method with ZnSO_4,NH_4HCO_3 and Fe_2（SO_4）_3·7H_2O as the raw materials.The structures were characterized by X-ray diffractometry.The photocatalytic performance of different Fe-ZnO samples was studied using an ultraviolet lamp as illumination device and methyl orange as stimulant pollutant.The effects of calcining temperature of different precursors,initial methyl orange concentrations,doping amounts of Fe and pH values on the degradation rate of methyl orange were investigated.It is found that in the doped samples（Fe-doping range of 0.5%～7.5%） at 400℃,0.5%Fe-ZnO is the most active.The degradation rate of methyl orange can reach to 84% by initial methyl orange concentration 0.5mg/l in 3h.The suitable condition of pH is weak acidity.