One-pot synthesis of novel ferric cubic mesoporous silica (Im3m symmetry) and its highly efficient adsorption performance
One-pot synthesis of novel ferric cubic mesoporous silica (Im3m symmetry) and its highly efficient adsorption performance
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DOI：
10.1039/c1jm11877c
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发表时间：
2011-08
影响因子：
--
通讯作者：
Yu Zhou;Jing Yang;Jia Yuan Yang;Fangna Gu;Ying Wang;J. Zhu
中科院分区：
文献类型：
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作者：
Yu Zhou;Jing Yang;Jia Yuan Yang;Fangna Gu;Ying Wang;J. Zhu
以柠檬酸为酸性介质，利用常规阳离子表面活性剂十六烷基三甲基溴化铵（CTAB）引导介孔结构沿着进行，通过I 0 HO-COO−S+的合成路线，首次合成了立方结构的Im 3 m介孔氧化硅及其金属取代类似物.这种弱酸性体系不仅有利于精细的相控制，而且有利于铁离子的最佳掺入，为制备具有令人惊讶的吸附能力的介孔复合材料提供了一种巧妙的方法。UV-vis DRS和ESR谱表明，大部分金属离子插入到硅质骨架的四面体配位环境中。由于可控掺入的铁物种，形成一个单层的通道壁加上三维笼状介孔结构，产生一个精细的几何约束对吸附质，中孔复合材料的瞬时吸附挥发性亚硝胺和1，3-丁二烯的第一次超越沸石NaY。
A novel facile route, denoted here as I0HO∼COO−S+, was reported to synthesize cubic Im3m mesoporous silicas and metal substituted analogues for the first time by utilizing commercial conventional cationic surfactant cetyltrimethylammonium bromide (CTAB) to direct the mesostructures along with citric acid as the acid media to give a weak acidic condition. This weak acidic system favors not only the fine phase control but also the optimal incorporation of ferric ions, providing a skilful way to prepare the mesoporous composites with a surprising adsorption capability. UV-vis DRS and ESR spectra indicated that the majority of the metal ions inserted into the siliceous framework within the tetrahedral coordination environment. Owing to the controllable incorporation of ferric species that form a monolayer on the channel wall plus the three-dimensional cage-like mesostructure that generates a fine geometric confinement towards the adsorbate, the mesoporous composite overruns zeolite NaY in the instantaneous adsorption of volatile nitrosamines and 1,3-butadiene for the first time.