Hierarchical silica monolith prepared using cellulose monolith as template
Hierarchical silica monolith prepared using cellulose monolith as template
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DOI：
10.1016/j.polymdegradstab.2020.109164
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发表时间：
2020-07-01
影响因子：
5.9
通讯作者：
Uyama, Hiroshi
中科院分区：
文献类型：
--
作者：
Lyu, Yanting;Asoh, Taka-Aki;Uyama, Hiroshi
具有连续多孔结构的二氧化硅整体由于其高性能的分离/吸附行为而在生物医学和环境应用中受到广泛关注。然而，很难在二氧化硅整体中保持多孔结构，因为它们的合成通常涉及溶胶-凝胶反应中复杂的相分离。在此，我们首次使用生态友好的纤维素材料作为模板制备亲水性和分级多孔二氧化硅整体料。纤维素整体模板由醋酸纤维素通过热诱导相分离方法制备。然后在纤维素整料存在下通过原硅酸四乙酯（TEOS）的典型溶胶-凝胶反应制备二氧化硅以形成复合整料，通过在空气中燃烧以除去纤维素整料将其转化为二氧化硅整料。由于纤维素整体模板的分级多孔结构，所获得的二氧化硅整体显示出类似的分级多孔结构，这通过扫描电子显微镜和氮气吸附-解吸分析证实。孔结构可以通过改变制造参数来控制，例如纤维素整料的种类和TEOS浓度。表面改性的二氧化硅整体料是为了进一步应用而开发的。 (C) 2020 Elsevier Ltd. 保留所有权利。
Silica monoliths with a continuous porous structure have received much attention in biomedical and environmental applications owing to their high-performance separation/adsorption behaviors. However, it is difficult to maintain a porous structure in silica monoliths because their synthesis often involves complicated phase separation in sol-gel reactions. Herein, for the first time, we used an ecofriendly cellulose material as a template to prepare a hydrophilic and hierarchically porous silica monolith. The cellulose monolith template was prepared from cellulose acetate by a thermally induced phase separation method. The silica was then prepared in the presence of the cellulose monolith by a typical sol-gel reaction of tetraethyl orthosilicate (TEOS) to form the composite monolith, which was converted to the silica monolith by burning in air to remove the cellulose monolith. Owing to the hierarchically porous structure of the cellulose monolith template, the obtained silica monolith showed a similar hierarchically porous structure, as confirmed by scanning electron microscopy and nitrogen adsorption-desorption analyses. The pore structure could be controlled by changing the fabrication parameters, such as the kind of cellulose monolith and TEOS concentration. The surface-modified silica monolith was developed for further applications. (C) 2020 Elsevier Ltd. All rights reserved.