UNAM-National Nanotechnology Research Center, Bilkent University, 06800 Ankara, Turkey.
UNAM-National Nanotechnology Research Center, Bilkent University, 06800 Ankara, Turkey; Institute of Materials Science & Nanotechnology, Bilkent University, 06800 Ankara, Turkey.
J Hazard Mater. 2017 Aug 5;335:108-116. doi: 10.1016/j.jhazmat.2017.04.022. Epub 2017 Apr 7.
Cyclodextrins (CDs) are sugar-based cyclic oligosaccharides, which form inclusion complexes with small guest molecules through their hydrophobic cavity. Here we successfully synthesized highly porous poly-cyclodextrin (poly-CD) cryogels, which were produced under cryogenic conditions by the cross-linking of amine-functional CDs with PEG-based diepoxide cross-linker. The poly-CD cryogels showed aligned porous network structures owing to the directional freezing of the matrix, of which the pore size and architecture exposed variations depending on the composition of the reactants. The cryogels were employed for the removal of genotoxic polycyclic aromatic hydrocarbons (PAHs) from aqueous solutions. They reached PAH sorption capacities as high as 1.25mg PAH per gram cryogel. This high sorption performance is due to interactions between PAHs and the complete swollen network, and thus, is not restricted by interfacial adsorption. Given that the hydrophilic nature of the components, the sorption performance could only be attributed to the inclusion complex formation of CDs with PAH molecules. The poly-CD cryogels could be recycled with an exposure to ethanol and reused without any significant loss in the sorption capacity of PAHs.
环糊精（CDs）是基于糖的环状低聚糖，通过其疏水性空腔与小分子客体分子形成包合物。在这里，我们成功地合成了高多孔性的聚环糊精（poly-CD）冷冻凝胶，它是在低温条件下通过胺功能化 CD 与基于 PEG 的二环氧交联剂的交联而产生的。聚-CD 冷冻凝胶由于基质的定向冻结而呈现出排列整齐的多孔网络结构，其孔径和结构的暴露取决于反应物的组成。该冷冻凝胶可用于从水溶液中去除遗传毒性多环芳烃（PAHs）。它们对多环芳烃的吸附容量高达每克冷冻凝胶 1.25mg。这种高吸附性能是由于多环芳烃与完全溶胀的网络之间的相互作用，因此不受界面吸附的限制。鉴于其亲水性质，吸附性能只能归因于 CD 与 PAH 分子的包合复合物形成。poly-CD 冷冻凝胶可以通过暴露于乙醇进行回收，并在不显著损失 PAH 吸附能力的情况下重复使用。
