School of Chemistry and Chemical Engineering, Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, Guangxi University, Nanning 530004, PR China.
School of Chemistry and Chemical Engineering, Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, Guangxi University, Nanning 530004, PR China.
J Colloid Interface Sci. 2021 Feb 1;583:100-112. doi: 10.1016/j.jcis.2020.09.006. Epub 2020 Sep 15.
To remove the bulky aqueous organic dye e.g. methyl blue (MB) from water, ordered mesoporous silica SBA-15 has been functionalized with β-cyclodextrin (β-CD) via amide linkage. The surface physical and chemical properties of the surface of the resulted β-CD-functionalized adsorbents (abbrev. SBA15-A-CD) were characterized systematically. The results indicate that the channels of SBA-15 were uniformly modified with amine groups and were further β-CD-terminated via amide linkages, without ruining its ordered mesoporous structure. The effects of contact time, pH, ionic strength, temperature and salt on the adsorption performance were explored. SBA15-A-CD showed maximum adsorption capacity for MB up to 1791 mg·g combined with excellent recyclability. Besides, the adsorption behavior of MB onto SBA15-A-CD has been investigated by DFT calculation and two-dimensional NMR. Specifically, the enhanced adsorption capacity for MB stems from the tailored host-guest interaction between β-CD cavity and aromatic moiety of MB in combination with the electrostatic attraction between amine groups and sulfonated group of MB. These findings offer good opportunities for improving the ability of mesoporous silica in adsorption of bulky anion dyes in wastewater.
为了去除体积庞大的有机水溶性染料，例如亚甲基蓝（MB），采用酰胺键将β-环糊精（β-CD）功能化有序介孔硅 SBA-15。系统地表征了所得β-CD 功能化吸附剂（简称 SBA15-A-CD）的表面物理化学性质。结果表明，SBA-15 的通道通过酰胺键均匀地被胺基修饰，并且进一步被β-CD 末端化，而不会破坏其有序介孔结构。考察了接触时间、pH 值、离子强度、温度和盐对吸附性能的影响。SBA15-A-CD 对 MB 的最大吸附容量高达 1791mg·g-1，同时具有出色的可回收性。此外，通过 DFT 计算和二维 NMR 研究了 MB 吸附到 SBA15-A-CD 上的吸附行为。具体而言，对 MB 的吸附容量增强源于β-CD 空腔和 MB 芳族部分之间的定制主客体相互作用，以及胺基和 MB 磺化基团之间的静电吸引力。这些发现为提高介孔硅在废水吸附体积庞大的阴离子染料方面的能力提供了良好的机会。
