Multi-Stimuli-Responsive Organogel Based on Bisthiourea Compounds for The Removal of Selected Organic Dyes
The self-assembly of a series of bisthiourea containing amino acid side chains has been studied in a large range of organic solvents. Self-assembly is driven mainly by hydrogen bonding groups of thiourea and amino acids moieties. Of all the synthesized compounds, only bisthiourea with alanine si...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
UNIMAS Publisher
2022
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| Subjects: | |
| Online Access: | http://ir.unimas.my/id/eprint/38771/3/Multi-Stimuli%20-%20Copy.pdf http://ir.unimas.my/id/eprint/38771/ https://publisher.unimas.my/ojs/index.php/BJRST/issue/view/203 |
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| Institution: | Universiti Malaysia Sarawak |
| Language: | English |
| Summary: | The self-assembly of a series of bisthiourea containing amino acid side chains has been studied in a large range of
organic solvents. Self-assembly is driven mainly by hydrogen bonding groups of thiourea and amino acids
moieties. Of all the synthesized compounds, only bisthiourea with alanine side chains, 3.5 formed thermoreversible
gel in 50:3 dichloromethane:water mixture at minimum gel concentration of 0.5%. SEM micrographs of the gel
showed the formation of entangled cross-linked fibres. The addition of anions such as Cl¯, F¯ and AcO¯ disrupted
the gel network of 3.5 thus inducing the gel-sol transition. To investigate the ability of the bisthiourea to form
metallogel, metal ions such as Co2+, Cu2+, Ni2+ and Pb2+ were introduced, however, none of them induce the
formation of metallogel. In particular, the gels show good performance in the absorption of bromocresol green and
Eriochrome black-T at 75% and 61% efficiency, respectively within 24 hours. The good dye absorption properties
of gel 3.5 render the potential of bisthiourea gels as new dye absorption materials, which show significant benefit
for water pollution treatment.
Keywords: Anion responsive, bisthiourea derivatives, organic dyes removal |
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