β-Cyclodextrin functionalized SBA-15 via amide linkage as a super adsorbent for rapid removal of methyl blue
β-Cyclodextrin functionalized SBA-15 via amide linkage as a super adsorbent for rapid removal of methyl blue
复制标题
β-环糊精通过酰胺键功能化 SBA-15 作为超级吸附剂，用于快速去除甲基蓝
DOI：
10.1016/j.jcis.2020.09.006
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发表时间：
2021-02-01
影响因子：
9.9
通讯作者：
Ji, Hongbing
中科院分区：
文献类型：
--
作者：
Li, Dongli;Chai, Kungang;Ji, Hongbing
为了去除水中大量的有机染料，如甲基蓝(MB)，有序介孔二氧化硅SBA-15通过酰胺键被β-环糊精(β-CD)官能化。对所得β-CD功能化吸附剂的表面物理和化学性质进行了研究。SBA15-A-CD)进行了系统的表征。结果表明，SBA-15分子筛的孔道均匀地被胺基团修饰，并通过酰胺键进一步被β-CD封端，而不破坏其有序的介孔结构。考察了接触时间、pH值、离子强度、温度和盐度对吸附性能的影响。SBA15-A-CD对MB的最大吸附容量可达1791mg.g(-1)，并具有良好的回收性能。此外，通过密度泛函理论计算和二维核磁共振研究了亚甲基蓝在SBA15-A-CD上的吸附行为。具体地说，对MB的吸附能力的提高源于β-CD空腔与MB的芳香族部分之间的量身定制的主客体相互作用以及MB的胺基与磺化基团之间的静电吸引。这些发现为提高介孔二氧化硅吸附废水中大体积阴离子染料的能力提供了很好的机会。(C)2020 Elsevier Inc.保留所有权利。
To remove the bulky aqueous organic dye e.g. methyl blue (MB) from water, ordered mesoporous silica SBA-15 has been functionalized with beta-cyclodextrin (beta-CD) via amide linkage. The surface physical and chemical properties of the surface of the resulted beta-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 beta-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(-1) 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 beta-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. (C) 2020 Elsevier Inc. All rights reserved.