Photo-induced super-hydrophilic property and photocatalysis on transparent Ti-containing mesoporous silica thin films
Photo-induced super-hydrophilic property and photocatalysis on transparent Ti-containing mesoporous silica thin films
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DOI：
10.1016/j.cattod.2005.10.061
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发表时间：
2006-02
期刊：
影响因子：
5.3
通讯作者：
H. Yamashita;S. Nishio;I. Katayama;N. Nishiyama;H. Fujii
中科院分区：
文献类型：
--
作者：
H. Yamashita;S. Nishio;I. Katayama;N. Nishiyama;H. Fujii
采用旋涂溶胶-凝胶法在石英板上制备了透明的含钛介孔二氧化硅薄膜。光谱表征表明，含钛介孔二氧化硅薄膜的骨架中含有孤立的四面体配位的氧化钛部分。与普通介孔二氧化硅薄膜相比，这些含钛介孔二氧化硅薄膜在紫外光照射前就表现出了很强的表面亲水性。紫外光照射后，水滴在含钛介孔二氧化硅薄膜上的接触角变小，表现出超亲水性能。在紫外光照射下，含钛介孔二氧化硅薄膜对丙烯的光催化氧化也表现出很高的选择性。孤立的和四面体配位的氧化钛部分是这些光诱导的表面反应的原因。
The transparent Ti-containing mesoporous silica thin films can be prepared on quartz plate using a spin-coating sol–gel method. The spectroscopic characterization has revealed that the Ti-containing mesoporous silica thin films contain isolated and tetrahedrally-coordinated titanium oxide moieties in the frameworks. Compared with the common mesoporous silica thin films, these Ti-containing mesoporous silica thin films have demonstrated a strong hydrophilic surface property even before UV-irradiation. After UV-light irradiation, the contact angle of water droplet on the Ti-containing mesoporous silica thin films became lower, indicating the appearance of the super-hydrophilic property. Under UV-light irradiation Ti-containing mesoporous silica thin films also exhibited highly selective activity for the photocatalytic oxidation of propylene. The isolated and tetrahedrally-coordinated titanium oxide moieties are responsible for these photo-induced surface reactions.