Amine‐functionalized ordered mesoporous silicas as model materials for liquid phase acid capture

Amine‐functionalized ordered mesoporous silicas as model materials for liquid phase acid capture
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胺功能化有序介孔二氧化硅作为液相酸捕获的模型材料

DOI:
10.1002/aic.16918
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发表时间:
2020
期刊:
影响因子:
3.7
通讯作者:
Shantz, Daniel F.
Shantz, Daniel F.
中科院分区:
工程技术3区
文献类型:
--
作者:
Miller, Peter J.;Shantz, Daniel F.

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吸收稀醋酸水溶液进行了比较,使用伯,仲,叔胺,和季铵接枝有序介孔二氧化硅。伯胺和季铵接枝的样品显示出最高的吸收,0.21 mmol乙酸/g SBA-15,仲胺和叔胺显示出标称较低的吸收,0.18 mmol/g,在每克SBA-15负载0.5 mmol氨基硅烷时。吸收过程中的溶液条件不同,得出的结论是,只有相关的乙酸可以结合,该机制严重依赖于静电相互作用。发现氨基硅烷堆积密度对性能至关重要,其变化取决于配体体积以及二氧化硅载体的孔径。纤维素解聚的相关溶液条件也通过比较多种有机酸的吸收和添加葡萄糖进行了探索。在这里,它表明,最疏水的有机酸被优先提取,并在葡萄糖的存在下的吸收增强。
Uptake of dilute aqueous acetic acid was compared using primary, secondary, tertiary amines, and quaternary ammonium grafted ordered mesoporous silica. Primary amine and quaternary ammonium grafted samples showed the highest uptake, 0.21 mmol acetic acid/g SBA‐15, with secondary and tertiary amines showing nominally lower, 0.18 mmol/g, at 0.5 mmol aminosilane loaded per gram SBA‐15. Solution conditions during uptake were varied to conclude that only associated acetic acid could be bound and that the mechanism relied heavily on electrostatic interactions. The aminosilane packing density was found to be crucial to performance with variation depending on the ligand bulk as well as the silica support's pore size. Relevant solution conditions for cellulose depolymerization were also explored by comparing uptake of multiple organic acids and with dextrose added. Here, it was shown that the most hydrophobic organic acid was preferentially extracted, and the uptake was enhanced in the presence of dextrose.
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