摘要
通过溶剂热和溶胶-凝胶涂层法,设计并制备了具有分级多孔结构和光催化性质的核-壳纳米球(HP-Fe2O3@TiO2).透射电子显微镜(TEM)照片证明所得HP-Fe2O3@TiO2样品具备分级多孔结构,这是因为HP-Fe2O3@TiO2的内核(Fe2O3)具有大孔空隙,同时外壳(TiO2)具有介孔空隙.此外,通过X射线衍射(XRD)、扫描电子显微镜(SEM)、高分辨透射电子显微镜(HRTEM)、X射线光电子能谱(XPS)以及氮气吸附-脱附曲线深入研究了HP-Fe2O3@TiO2的结构及其性质.分别在可见及紫外光照下,研究了样品在H2O2体系下的光催化降解亚甲基蓝(MB)的性质.所观察到的HP-Fe2O3@TiO2纳米球的光催化性能,可归因于核-壳结构的协同作用,这进一步表明,TiO2外壳对α-Fe2O3的光催化活性有重要影响作用.在可见光照射下,HP-Fe2O3@TiO2(1mLTi(OC4H9)4(TBT))具有较优异的光催化活性.同时,HP-Fe2O3@TiO2(4mLTBT)具备优异的单分散形貌,并在紫外光照射下,表现出最优的光催化活性.
Core-shell photocatalysts of hierarchical porous nanospheres （HP-Fe2O3@TiO2） have been designed and prepared using solvothermal and sol-gel methods. Transmission electron microscopy （TEM） images confirm that the obtained samples have a hierarchical porous structure, which results from both the macroporous structure of the core （Fe2O3） and the mesoporous structure of the shell （TiO2）. X-ray diffraction （XRD）, scanning electron microscopy （SEM）, high-resolution transmission electron microscopy （HRTEM）, X-ray photoelectron spectroscopy （XPS）, and nitrogen adsorption-desorption isotherms were employed to characterize the structure and properties of HP-Fe2O3@TiO2 nanospheres. We investigated the photocatalytic degradation （in the presence of H2O2） of methylene blue （MB） irradiated under visible and ultraviolet light. The observed photocatalytic performance of HP-Fe2O3@TiO2 nanospheres is attributed to the synergetic effects of the core-shell structure, which indicates that the TiO2 shell enhances the photocatalytic performance of α-Fe2O3. HP-Fe2O3@TiO2（1 mL Ti（OC, Hg）4 （TBT）） possesses the highest photodegradation reaction constant among all samples under visible light irradiation. Moreover, HP-Fe2O3@TiO2 （4 mL TBT） has an optimal monodisperse morphology and achieves high photocatalytic activity under ultraviolet light irradiation.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2013年第1期167-175,共9页
Acta Physico-Chimica Sinica
基金
supported by the National Natural Science Foundation of China(21201085)
Natural Science Foundation of Jiangsu Province,China(BK2012294)
Jiangsu University College Student Scientific Research Project,China(Y11A018)~~
