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

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Amine‐functionalized ordered mesoporous silicas as model materials for liquid phase acid capture
AIChE Journal ( IF 3.5 ) Pub Date : 2020-01-24 , DOI: 10.1002/aic.16918
Peter J. Miller ₁ , Daniel F. Shantz ₁

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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.

中文翻译：

胺官能化有序介孔二氧化硅作为液相酸捕集的模型材料

使用伯，仲，叔胺和季铵接枝有序介孔二氧化硅比较了稀乙酸水溶液的吸收。伯胺和季铵接枝样品显示最高吸收量，为0.21 mmol乙酸/ g SBA-15，而每克SBA-15负载0.5 mmol氨基硅烷时，仲胺和叔胺的名义吸收量名义上较低，为0.18 mmol / g。吸收过程中的溶液条件各不相同，可以得出结论，只有相关的乙酸可以被结合，并且该机理在很大程度上依赖于静电相互作用。发现氨基硅烷的堆积密度对于性能至关重要，其变化取决于配体的体积以及二氧化硅载体的孔径。通过比较多种有机酸的摄取以及添加葡萄糖的情况，还探索了纤维素解聚的相关溶液条件。在此显示出，最疏水的有机酸被优先提取，并且在葡萄糖的存在下摄取被增强。

更新日期：2020-01-24

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