Hydrogels facilitated by monovalent cations and their use as efficient dye adsorbents.
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.
Key Laboratory of Colloid and Interface Chemistry & Key Laboratory of Special Aggregated Materials ( Shandong University ), Ministry of Education, Jinan 250100, China.
Haiqiao
H
Wang
Wenlong
W
Xu
Shasha
S
Song
Lei
L
Feng
Aixin
A
Song
Jingcheng
J
Hao
D000327:Adsorption; D002414:Cations, Monovalent / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D020100:Hydrogels / Q000737:chemistry*; D008095:Lithocholic Acid / Q000737:chemistry*; D055595:Mechanical Phenomena; D008751:Methylene Blue / Q000737:chemistry; D012235:Rhodamines / Q000737:chemistry; D013696:Temperature; D014867:Water / Q000737:chemistry
D002414:Cations, Monovalent; D004396:Coloring Agents; D020100:Hydrogels; D012235:Rhodamines; C026188:rhodamine 6G; D014867:Water; D008095:Lithocholic Acid; D008751:Methylene Blue