Absorption of organic compounds by mesoporous silica discoids
Absorption of organic compounds by mesoporous silica discoids
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DOI：
10.1016/j.micromeso.2020.110379
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发表时间：
2020-10
影响因子：
5.2
通讯作者：
S. Palantavida;Berney Peng;I. Sokolov
中科院分区：
文献类型：
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作者：
S. Palantavida;Berney Peng;I. Sokolov
多种有机化合物对人类健康构成威胁。在这里，我们报告了一种新型的纳米结构的吸收剂，介孔胶体二氧化硅颗粒（孔径约3 nm，表面积>1100 m2/g，盘状和微米大小），可以是一个有效的吸附剂的有机化合物，由于其大的表面积的合成。通过三甲基氯硅烷处理使颗粒表面疏水化，所述三甲基氯硅烷处理在本体（TGA分析）和单个颗粒（共焦拉曼光谱）的水平上进行控制。我们提出了十种不同分子大小和极性的有机化合物的吸附研究结果。发现我们的颗粒可以从水中吸收一些有机化合物，按重量计超过100%。吸附效率对分子大小没有实质性的依赖性被发现，尽管复杂的纳米级环境中，它被发现的吸附效率与极性的有机组分，这是类似于经典的吸附剂。此外，我们证明了疏水基团的存在和吸收的化合物与亚微米分辨率的共聚焦拉曼显微镜之间的强相关性。这些知识可用于设计新的高效吸收剂。
Multiple organic compounds pose a threat to human health. Here we report on the synthesis of a novel nanostructured absorbent, mesoporous colloidal silica particles (pore size of ~3 nm, surface area >1100 m2/g, discoid-shaped and microns in size) that can be an effective sorbent for organic compounds due to their large surface area. The particle surface is hydrophobized through a trimethylchlorosilane treatment, which was controlled on the level of bulk (TGA analysis) and single particles (confocal Raman spectroscopy). We present the results of the study of the sorption of ten organic compounds of various molecular size and polarity. It is found that our particles can absorb some organic compounds from water up to more than 100% by weight. No substantial dependence of the sorption efficiency on the molecular size was found. Despite a complex nanoscale environment, it was found that the sorption efficiency inversely correlates with the polarity of the organic components, which is similar to the classical sorbents. Further, we demonstrate a strong correlation between the presence of hydrophobic groups and the absorbed compound with a submicron resolution by means of confocal Raman microscopy. This knowledge can be used to design new efficient absorbents.