A New Synthetic Route to Microporous Silica with Well-Defined Pores by Replication of a Metal-Organic Framework
A New Synthetic Route to Microporous Silica with Well-Defined Pores by Replication of a Metal-Organic Framework
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DOI：
10.1002/chem.201501599
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发表时间：
2015-08-17
影响因子：
4.3
通讯作者：
Maeda, Kazuyuki
中科院分区：
文献类型：
--
作者：
Kondo, Atsushi;Hall, Anthony Shoji;Maeda, Kazuyuki
通过复制金属-有机骨架(MOF)[Cu3(1，3，5-苯三甲酸酯)(2)](HKUST-1)合成了具有良好孔结构的微孔无定形疏水二氧化硅材料。以正硅酸乙酯或正硅酸乙酯为二氧化硅前驱体制备的二氧化硅复制品具有微-介观二元孔体系。在423K下用正硅酸乙酯水热处理得到的二氧化硅复制品的比表面积为620m(2)g(-1)，微孔体积为0.18mLg(-1)，中孔体积为0.55mLg(-1)。有趣的是，二氧化硅具有孔径为0.55 nm的微孔，与模板MOF的孔壁厚度相对应。吸附分析证实，硅胶复制品是疏水的，尽管复制品含有一定量的硅醇基团。这种疏水性是由于模板MOF中二氧化硅前体独特的缩合环境造成的。
Microporous amorphous hydrophobic silica materials with well-defined pores were synthesized by replication of the metal-organic framework (MOF) [Cu-3(1,3,5-benzenetricarboxylate)(2)] (HKUST-1). The silica replicas were obtained by using tetramethoxysilane or tetraethoxysilane as silica precursors and have a micro-meso binary pore system. The BET surface area, the micropore volume, and the mesopore volume of the silica replica, obtained by means of hydrothermal treatment at 423K with tetraethoxysilane, are 620m(2)g(-1), 0.18mLg(-1), and 0.55mLg(-1), respectively. Interestingly, the silica has micropores with a pore size of 0.55nm that corresponds to the pore-wall thickness of the template MOF. The silica replica is hydrophobic, as confirmed by adsorption analyses, although the replica has a certain amount of silanol groups. This hydrophobicity is due to the unique condensation environment of the silica precursors in the template MOF.