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Hydrogels facilitated by monovalent cations and their use as efficient dye adsorbents.

Authors
  • Wang, Haiqiao
  • Xu, Wenlong
  • Song, Shasha
  • Feng, Lei
  • Song, Aixin
  • Hao, Jingcheng
Type
Published Article
Journal
The Journal of Physical Chemistry B
Publisher
American Chemical Society
Publication Date
May 01, 2014
Volume
118
Issue
17
Pages
4693–4701
Identifiers
DOI: 10.1021/jp500113h
PMID: 24707858
Source
Medline
License
Unknown

Abstract

Gelation behavior of lithocholate (LC(-)) 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 "salting-out" 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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