Superhydrogels of nanotubes capable of capturing heavy-metal ions.
Superhydrogels of nanotubes capable of capturing heavy-metal ions.
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DOI：
10.1002/asia.201300892
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
Shasha Song;Haiqiao Wang;Aixin Song;J. Hao
中科院分区：
文献类型：
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作者：
Shasha Song;Haiqiao Wang;Aixin Song;J. Hao
在石胆酸（LCA）与乙醇胺（EA）、二乙醇胺（DEA）和三乙醇胺（TEA）的混合体系中，成功实现了氢键调控的自组装.结果表明，DEA/LCA混合物具有超凝胶化能力，低温TEM显示，水凝胶由大量直径约60 nm的均匀网状纳米管组成。有趣的是，在EA和LCA体系中具有相同浓度的样品是双折射溶液，其中球形囊泡可以随着LCA量的增加而转变为纳米管。水凝胶的形成可以由各种非共价相互作用的微妙平衡驱动，包括静电相互作用、疏水相互作用、空间效应、货车范德华力，并且主要是氢键。提出了球形双层囊泡自组装成纳米管的机理。研究了纳米管水凝胶对Cu（2+）、Co（2+）、Ni（2+）、Pb（2+）、Hg（2+）等重金属离子的吸附性能。由氢键调控的低分子量凝胶因子自组装形成的纳米管超水凝胶用于去除重金属离子具有简单、绿色、高效等特点，为工业废水中重金属离子的去除提供了一条战略途径。
Self-assembly regulated by hydrogen bonds was successfully achieved in the system of lithocholic acid (LCA) mixed with three organic amines, ethanolamine (EA), diethanolamine (DEA), and triethanolamine (TEA), in aqueous solutions. The mixtures of DEA/LCA exhibit supergelation capability and the hydrogels consist of plenty of network nanotubes with uniform diameters of about 60 nm determined by cryogenic TEM. Interestingly, the sample with the same concentration in a system of EA and LCA is a birefringent solution, in which spherical vesicles and can be transformed into nanotubes as the amount of LCA increases. The formation of hydrogels could be driven by the delicate balance of diverse noncovalent interactions, including electrostatic interactions, hydrophobic interactions, steric effects, van der Waals forces, and mainly hydrogen bonds. The mechanism of self-assembly from spherical bilayer vesicles into nanotubes was proposed. The dried hydrogels with nanotubes were explored to exhibit the excellent capability for capturing heavy-metal ions, for example, Cu(2+), Co(2+), Ni(2+), Pb(2+), and Hg(2+). The superhydrogels of nanotubes from the self-assembly of low-molecular-weight gelators mainly regulated by hydrogen bonds used for the removal of heavy-metal ions is simple, green, and high efficiency, and provide a strategic approach to removing heavy-metal ions from industrial sewage.