Hollow Sphere TiO2–ZrO2 Prepared by Self-Assembly with Polystyrene Colloidal Template for Both Photocatalytic Degradation and H2 Evolution from Water Splitting

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• 作者：Jianqi Zhang ; Li Li ; Zhixin Xiao ; Di Liu ; Shuang Wang ; Jingjing Zhang ; Yuting Hao ; Wenzhi Zhang
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2016
• 出版时间：April 4, 2016
• 年：2016
• 卷：4
• 期：4
• 页码：2037-2046
• 全文大小：703K
• ISSN：2168-0485

文摘

On the basis of a self-assembly technique with polystyrene (PS) spheres as colloidal template, the composite TiO₂–ZrO₂ hollow spheres are synthesized by combining a water bath with a calcining postprocessing method. XRD, UV–vis/DRS, XPS, SEM–EDS, TEM, HR-TEM, and N₂ adsorption–desorption measurements are employed to characterize the composition, structure, and morphology of TiO₂–ZrO₂ hollow spheres. The results show that TiO₂–ZrO₂ hollow spheres are mainly TiO₂ anatase and retain well the spherical structure of the PS crystal template, whose shell is closely packed by TiO₂–ZrO₂ nanoparticles, with thickness of ca. 24 nm. The combination of TiO₂ and ZrO₂ and the special hollow structure are beneficial to improve the photocatalytic activity. TiO₂–ZrO₂ hollow spheres have remarkable photocatalytic properties under UV light, simulated sunlight, and microwave-assisted three different modes, which can also degrade organic pollutants of different structures. In addition, the H₂ evolution quantity in 8 h, which is produced by the photolysis of water, is 23.7 μmol, indicating that TiO₂–ZrO₂ hollow spheres have a certain hydrogen production performance. Moreover, the results of the trapping experiment indicate that the active radicals ^•O₂^–, h⁺, and ^•OH^– are responsible for the photocatalytic reaction, and the possible reaction mechanism of TiO₂–ZrO₂ hollow spheres in both photocatalytic degradation and photocatalytic H₂ evolution from splitting water is also proposed.