Hydrogels Facilitated by Monovalent Cations and Their Use as Efficient Dye Adsorbents
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- 作者：Haiqiao Wang ; Wenlong Xu ; Shasha Song ; Lei Feng ; Aixin Song ; Jingcheng Hao
- 刊名：Journal of Physical Chemistry B
- 出版年：2014
- 出版时间：May 1, 2014
- 年：2014
- 卷：118
- 期：17
- 页码：4693-4701
- 全文大小：501K
- 年卷期：v.118,no.17(May 1, 2014)
- ISSN：1520-5207
文摘
Gelation behavior of lithocholate (LC鈥?/sup>) mixed with different monovalent cations in water was detected. The hydrogels consisting of tubular networks were formed by introducing alkali metal ions and NH4+ to lithocholate aqueous solutions at room temperature. The formation of tubular structures was considered to be mainly driven by the electrostatic interaction with the assistance of a delicate balance of multiple noncovalent interactions. It is interesting that the increase in temperature can induce a significant enhancement in strength of the hydrogels, accompanied by the formation of bundles of tubules and larger size aggregates. The mechanism of the temperature-induced transition can be explained by the 鈥渟alting-out鈥?effect and the electric double layer model. The hydrogels showed very high adsorption efficiency and adsorption capability for the cationic dyes and were promising to act as toxic substance adsorbents.
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