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首页> 外文期刊>RSC Advances >Amino-functionalized ordered mesoporous silica SBA-15, a rapid and efficient adsorbent for the adsorption of (-)-epigallocatechin gallate from green tea extract
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Amino-functionalized ordered mesoporous silica SBA-15, a rapid and efficient adsorbent for the adsorption of (-)-epigallocatechin gallate from green tea extract

机译：氨基官能化有序介孔二氧化硅SBA-15，一种快速有效的从绿茶提取物中吸附（-）-表没食子儿茶素没食子酸酯的吸附剂

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摘要

Ordered mesoporous silica SBA-15 with different pore size and organic groups (-SH, -NH2, -COOH) were synthesized. The adsorption of (-)-epigallocatechin gallate (EGCG) from green tea extract (GTE) was conducted on these functional ordered mesoporous silica SBA-15, which were studied as a class of potential adsorbents. The adsorption performance of EGCG was correlated with the surface chemistry and pore size. Amino-functionalized SBA-15 (SBA-15-NH2) with a large pore size (10.7 nm) exhibited extremely rapid rate as well as high capacity of 287 mg g(-1) for adsorbing EGCG at 25 degrees C, which is much higher than that of other adsorbent previously reported. EGCG rather than CAF were preferred to adsorb onto SBA-15-140 degrees C-NH2 since the adsorption capacity of EGCG was almost 19 times as high as that of CAF (287 mg g(-1) vs. 15 mg g(-1)). The kinetic data were well fitted with pseudo-second-order kinetics based on an evaluation of the adsorption kinetics. Furthermore, the Langmuir and Freundlich isotherms provided additional information for better understanding of the adsorption process. Hydrogen bonding and electrostatic interaction were the main driving forces for the adsorption of EGCG on the SBA-15-NH(2)s. Considering the excellent adsorption performance, it is expected that mesoporous silica materials are attractive for the separation and enrichment of EGCG.
机译：合成了具有不同孔径和有机基团（-SH，-NH2，-COOH）的有序介孔二氧化硅SBA-15。在这些功能性有序介孔二氧化硅SBA-15上进行了从绿茶提取物（GTE）上吸附（-）-表没食子儿茶素没食子酸酯（EGCG）的研究，将其作为一类潜在的吸附剂进行研究。 EGCG的吸附性能与表面化学性质和孔径有关。具有大孔径（10.7 nm）的氨基官能化SBA-15（SBA-15-NH2）表现出极快的速度以及287 mg g（-1）在25摄氏度下吸附EGCG的高容量高于先前报道的其他吸附剂。由于EGCG的吸附能力几乎是CAF的19倍（287 mg g（-1）与15 mg g（-1），因此EGCG而不是CAF最好吸附到SBA-15-140°C-NH2上））。基于吸附动力学的评估，动力学数据与拟二级动力学很好地吻合。此外，Langmuir和Freundlich等温线还提供了其他信息，可以更好地理解吸附过程。氢键和静电相互作用是EGCG在SBA-15-NH（2）s上吸附的主要驱动力。考虑到优异的吸附性能，预期中孔二氧化硅材料对于EGCG的分离和富集具有吸引力。

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