Influence of water on amine loading for ordered mesoporous silica
Influence of water on amine loading for ordered mesoporous silica
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DOI：
10.1016/j.ces.2021.116717
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发表时间：
2021-05-07
影响因子：
4.7
通讯作者：
Yang, Ralph T.
中科院分区：
文献类型：
--
作者：
Anyanwu, John-Timothy;Wang, Yiren;Yang, Ralph T.
采用介孔二氧化硅 SBA-15 系统研究了胺接枝过程中水浓度以及胺负载量的影响。结果发现，与醇相比，水是影响胺负载量的更有效的试剂。添加醇并不会导致胺负载量增加；然而，添加水会导致更高的胺负载量。在报道的合成条件下，水浓度的进一步增加导致胺负载量进一步增加，但没有达到稳定水平。此外，在胺接枝过程中将氨基硅烷含量增加到超过 2 mL/g (SiO2) 并不会产生更高的胺负载量。此外，接枝过程中仅存在水就会影响氨基硅烷的接枝率，导致胺在30分钟内完全接枝到载体上。还证明了湿接枝材料的稳定性以及所研究的其他氨基硅烷和介孔二氧化硅载体（KIT-6 和 MCM-48）效果的普遍性。 (C) 2021 Elsevier Ltd. 保留所有权利。
SBA-15, a mesoporous silica, was employed to systematically study the influence of water concentration during amine grafting and also on amine loading. It was found that water as opposed to alcohol was a more effective agent for influencing amine loading. The addition of alcohol did not result in higher amine loadings; however, the addition of water leads to higher amine loading. Under the reported synthesis conditions, further increase in water concentration resulted in further increase in amine loading without plateauing. Additionally, increasing the aminosilane content beyond 2 mL/g (SiO2) during amine grafting did not yield higher amine loading. Moreover, the mere presence of water during grafting affects the grafting rate of the aminosilanes, resulting in complete grafting of amines to supports in 30 min. The stability of wet grafted materials and the universality of the studied effects for other aminosilanes and mesoporous silica supports (KIT-6 and MCM-48) were also demonstrated. (C) 2021 Elsevier Ltd. All rights reserved.