应用固相烧结法制备了半导体光催化材料MgNb2O6, CaNb2O6, SrNb2O6, BaNb2O6, NiNb2O6粉体. 利用XRD、UV-Vis漫反射谱、扫描电镜对上述粉体晶体结构、光谱性质和形貌进行了分析. 在紫外光下对其降解罗丹明B(RhB)的光催化性能进行了评估. 结果表明, 碱土金属Sr、Ba对NiNb2O6中Ni的取代能很好地提高铌酸盐的光催化效果, 在10h紫外光照射下能分别将RhB的浓度降解到原来的21%和37%.
Powder samples, NiNb2O6, MgNb2O6, CaNb2O6, SrNb2O6, BaNb2O6, were prepared by solid state reaction. Crystal structure, optical and powder morphology of the samples were analyzed by XRD, UV-Vis diffuse reflectance spectra and SEM. The photocatalytic properties were investigated by degrading rhodamine B under UV irradiation. The substitution of alkaline-earth metals for Ni improves the photocatalytic activity of MNb2O6. After UV irradiation for 10h, the concentrations of RhB/SrNb2O6 suspension and RhB/BaNb2O6 suspension are degraded to 21% and 37%, respectively.
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