介孔材料
光催化
煅烧
材料科学
化学工程
透射电子显微镜
多孔性
结晶
介孔有机硅
比表面积
蒸发
解吸
吸附
介孔二氧化硅
纳米技术
催化作用
化学
复合材料
有机化学
工程类
物理
热力学
作者
Xinyi Chen,Tao Yu,Xiaoxing Fan,Haitao Zhang,Zhaosheng Li,Jinhua Ye,Zhigang Zou
标识
DOI:10.1016/j.apsusc.2007.04.035
摘要
The mesoporous Nb2O5 photocatalysts were synthesized via an evaporation-induced self-assembly (EISA) method. The mesoporous structure of the as-made samples was studied by small-angle X-ray diffraction, N2 adsorption–desorption isothermal and transmission electron microscopy. The increase of the calcination temperature during the synthesis resulted in enhanced crystallization, but decreased mesoporosity of the samples. The later was found to have a crucial influence on the photocatalytic activity by bringing on decreased BET surface area and especially increscent pore wall thickness. The advantage of the mesoporous Nb2O5 was also proved by performing 20 times higher photocatalytic activity than a bulk Nb2O5 without any porosity. A model was given to describe the effect of mesoporosity on the transportation and recombination of carriers.
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