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采用溶胶—凝胶法制备了掺杂不同量Fe,N的TiO2/SiO2复合纳米粒子。通过红外光谱、X射线衍射、透射电子显微镜等对制备的样品的结构和形貌进行表征。以甲基橙水溶液的光催化降解为模拟反应,在紫外光照射下评价了样品的光催化活性。结果表明:Fe,N共掺杂TiO2/SiO2为核壳结构,SiO2核与TiO2壳间形成了Ti—O—Si键。由于金属Fe3+离子抑制光生载流子的复合,非金属N降低了TiO2/SiO2的带隙能,Fe,N共掺杂的协同作用使复合TiO2/SiO2具有更好的光催化性能。共掺杂0.05%Fe及0.05%N的TiO2/SiO2复合光催化粒子的催化活性最高,光照1h后对甲基橙的降解率提高到52%。
Abstract：The composite nanoparticles of TiO2/SiO2with different mole fractions of Fe,N were prepared by a sol-gel method. The structure and morphology of the obtained samples were characterized by Fourier transform infrared spectroscopy,X-ray diffraction and transmission electron microscopy,respectively.The photocatalytic activity was evaluated viathe degradation of methyl orange solution under UV light irradiation.The results show that the TiO2/SiO2co-doped with iron and nitrogen appears a core-shell structure.The phase transition of TiO2at a high temperature was affected due to the formation of the Ti— O—Si bond.The higher UV—visible light photocatalytic activity of co-doped TiO2is attributed to the partial N atoms,leading to the decrease of the band gap and the absorption edge of TiO2/SiO2to be shifted into the lower-energy region.The doping of Fe3+restrains a recombination rate of photogenerated electrons and holes.The doping can favor the improvement of the photocatalysis of TiO2/SiO2co-doped with iron and nitrogen under UV light irradiation.The TiO2/SiO2composite particles co-doped with 0.05% Fe and 0.05% N has the optimum catalytic activity,and the degradation rate of methyl orange increases to 52% after UV light irradiation for 1h.
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基本信息:
中图分类号:TB332
引用信息:
[1]赵芳,倪刚,赵雅琼,等.Fe,N共掺杂TiO_2/SiO_2复合材料的制备及光催化性能[J].硅酸盐学报,2014,42(06):802-807.
基金信息:
国家自然科学基金(21067010);; 宁夏高校科学研究基金(2012)资助项目
2014-06-04
2014-06-04
2014-06-04