Facile Preparation of Hierarchically Porous TiO2 Monoliths
Facile Preparation of Hierarchically Porous TiO2 Monoliths
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DOI：
10.1111/j.1551-2916.2010.03831.x
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发表时间：
2010-10-01
影响因子：
3.9
通讯作者：
Hanada, Teiichi
中科院分区：
文献类型：
--
作者：
Hasegawa, George;Kanamori, Kazuyoshi;Hanada, Teiichi
采用溶胶-凝胶法，通过螯合剂和无机盐的相分离，成功地制备了具有多尺度多孔结构的单块二氧化钛（TiO 2）。所得到的TiO 2凝胶具有定义明确的大孔衍生自调幅分解和介孔作为间隙的纳米TiO 2。大部分螯合剂通过水解和随后的脱碳酸作用通过从乙醇到水的逐渐溶剂交换而除去。在60 ℃的温和条件下，通过溶剂交换过程，包含TiO 2凝胶骨架的TiO 2颗粒自发地从无定形转化为无定形。本发明制备多孔TiO 2整料的方法对于广泛应用是有利的，因为反应在几乎中性的条件下发生并且不需要水热过程，水热过程对于在先前报道的方法中强化整料是必不可少的。
Monolithic titania (TiO2) with multiscale porous structures have been successfully prepared via the sol-gel route accompanied by phase separation utilizing a chelating agent and mineral salt. The TiO2 gels obtained possess well-defined macropores derived from spinodal decomposition and mesopores as interstices of anatase TiO2 nanocrystallites. Most of the chelating agent were removed by hydrolysis and subsequent decarbonation through the gradual solvent exchange from ethanol to water. The TiO2 particles comprising TiO2 gel skeletons spontaneously converted from amorphous to anatase through the solvent exchange process in a mild condition at 60 degrees C. The present method of the fabrication of porous TiO2 monoliths is advantageous for widespread applications because the reaction occurs under an almost neutral condition and does not require a hydrothermal process, which was indispensable to strengthen the monolith in the method previously reported.