论文部分内容阅读
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.
The HP-Fe2O3 @ TiO2 nanoparticles with hierarchical porous structure and photocatalytic properties were designed and prepared by solvothermal and sol-gel coating methods. Transmission electron microscopy (TEM) images demonstrated that the obtained HP-Fe2O3 @ The TiO2 sample possesses hierarchical porous structure because of the macroporous voids and the mesoporous voids of the shell (Fe2O3) of the HP-Fe2O3 @ TiO2 matrix. In addition, the microstructure of the samples is characterized by X-ray diffraction (XRD), scanning electron microscopy ), High resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS) and nitrogen adsorption-desorption curves were used to investigate the structure and properties of HP-Fe2O3 @ TiO2. Photocatalytic Degradation of Methylene Blue (MB) under H2O2 System The observed photocatalytic properties of HP-Fe2O3 @ TiO2 nanospheres can be attributed to the synergistic effect of core-shell structure, which further indicates that TiO2 shell Fe2O3 @ TiO2 (1mLTi (OC4H9) 4 (TBT)) has excellent photocatalytic activity under the visible light irradiation.At the same time, HP-Fe2O3 @ TiO2 (4mLTBT ) Has excellent monodisperse morphology and is shown under UV light irradiation Optimal photocatalytic activity.