ZrO₂ 修饰的介孔纳米晶 TiO₂₋ₓNₓ 作为高效可见光光催化剂
ZrO2-modified mesoporous nanocrystalline TiO2-xNx as efficient visible light photocatalysts.
作者信息
Wang Xinchen, Yu Jimmy C, Chen Yilin, Wu Ling, Fu Xianzhi
机构信息
Research Institute of Photocatalysis, College of Chemistry and Chemical Engineering, Fuzhou University, Fuzhou 350002, China.
出版信息
Environ Sci Technol. 2006 Apr 1;40(7):2369-74. doi: 10.1021/es052000a.
Mesoporous nanocrystalline TiO2-xNx and TiO2-xNx/ZrO2 visible-light photocatalysts have been prepared by a sol-gel method. The photocatalysts were characterized by XRD, N2 adsorption-desorption, TEM, XPS, UV/Vis, and IR spectroscopy. The photocatalytic activity of the samples was evaluated by the decomposition of ethylene in air under visible light (lambda > 450 nm) illumination. Results revealed that nitrogen was doped into the lattice of TiO2 by the thermal treatment of NH3-adsorbed TiO2 hydrous gels, converting the TiO2 into a visible-light responsive catalyst. The introduction of ZrO2 into TiO2-xNx considerably inhibits the undesirable crystal growth during calcination. Consequently, the ZrO2-modified TiO2-xNx displays higher porosity, higher specific surface area, and an improved thermal stability over the corresponding unmodified TiO2-xNx samples.
采用溶胶-凝胶法制备了介孔纳米晶TiO2-xNx和TiO2-xNx/ZrO2可见光光催化剂。通过XRD、N2吸附-脱附、TEM、XPS、UV/Vis和IR光谱对光催化剂进行了表征。在可见光（λ>450nm）照射下，通过空气中乙烯的分解来评价样品的光催化活性。结果表明，通过对吸附NH3的TiO2水凝胶进行热处理，氮被掺杂到TiO2晶格中，将TiO2转化为可见光响应催化剂。将ZrO2引入TiO2-xNx中可显著抑制煅烧过程中不希望的晶体生长。因此，与相应的未改性TiO2-xNx样品相比，ZrO2改性的TiO2-xNx具有更高的孔隙率、更高的比表面积和更好的热稳定性。
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