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J Colloid Interface Sci. 2018 Sep 1;525:177-186. doi: 10.1016/j.jcis.2018.04.055. Epub 2018 Apr 13.

Two-component gelator isomers with different combination of amine and acid: Helical/non-helical morphology and selective adsorption of dyes.

Author information

1
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China.
2
Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
3
Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin 300071, China.
4
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China. Electronic address: baozhang@tju.edu.cn.
5
Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin 300071, China. Electronic address: xxfang@nankai.edu.cn.
6
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China; Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China. Electronic address: songjian@tju.edu.cn.

Abstract

Hydrogels induced by two-component gelator isomers based on the different amine/acid interactions were investigated. Scanning electron microscopy and atomic force microscopy images of the xerogel obtained from the two hydrogels revealed different assembly morphologies. While left-handed helical fibers were observed for the amine-acid based xerogel, acid-amine underwent self-assembly to afford smooth fibers. Fourier transform infrared spectroscopy, fluorescence, and X-ray diffraction measurements combined with density functional theory calculations suggested that the different self-assembly patterns of gelators resulted in opposite electric charges on the xerogel surfaces, in line with Zeta potential measurements. Based on these opposite charges resulting from their different self-assemblies, both xerogels demonstrated efficient dye adsorption abilities with different selectivities. Interestingly, the adsorption performance was not influenced by the salt in the dye solution. Furthermore, the xerogels still showed high dye adsorption efficiency after four cycles. These results provide a two-component hydrogel method for the purification of dye-polluted water systems, while also paving the way for future design of functionalized supramolecular self-assembly systems.

KEYWORDS:

Dmye adsorption; Isomers; Self-assembly; Supramolecular chemistry; Two-component hydrogel

PMID:
29702323
DOI:
10.1016/j.jcis.2018.04.055

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