摘要
光催化剂SrNb_2O_6采用传统固相反应分别在合成温度为950℃(低温)和1400℃(高温)进行制备.通过XRD粉末衍射和UV-Vis吸收光谱分析,表征了样品的物相和光谱吸收特性.通过对高低温样品的测试和分析表明,高温样品具有单一的物相,而低温样品反应并不完全,是一个混合物.在SrNb_2O_6光催化活性研究中,常用的甲基橙被选作染料光降解模型,对比试验表明低温样品的光催化活性远高于纯相样品SrNb_2O_6或Nb_2O_5.经过讨论和分析,推断出低温产物中存在的异质结(SrNb_2O_6/Nb_2O_6)是提高光催化性能的根本原因.
SrNb2O6 powders were prepared by a conventional solid-state method and characterized by X-ray powder diffraction and UV-Vis diffuse reflection spectra. Their photocatlytic activities were investigated on the degradation of methyl orange. The results show that the photocatalytic activity of pure phase SrNb2O6 calcined at 1400℃ is lower than that of the impure phase SrNb2O6 calcined at 950℃. The heterojunction model is used to explain that the impure sample can improve the photocatalytic activity due to the interface interaction of Nb2O5 and SrNb2O6.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第5期927-930,共4页
Journal of Inorganic Materials
基金
国家自然科学基金(20471068)
上海市基础重点项目(05JC14079)
