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Removal of anionic azo dyes from aqueous solution by functional ionic liquid cross-linked polymer
Hejun Gao1, Taotao Kan, Siyuan Zhao
1Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, China; Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province, China West Normal University, Nanchong 637000, China.
Journal of Hazardous Materials
|August 6, 2013
Summary
A new functional ionic liquid polymer adsorbent efficiently removes anionic azo dyes. This cross-linked poly(divinylbenzene)-ionic liquid (PDVB-IL) shows high adsorption capacities, outperforming existing materials.
Area of Science:
- Materials Science
- Environmental Chemistry
- Polymer Chemistry
Background:
- Anionic azo dyes pose environmental challenges due to their widespread use and persistence.
- Developing efficient and cost-effective adsorbents is crucial for dye removal from wastewater.
Purpose of the Study:
- To synthesize and characterize a novel functional ionic liquid based cross-linked polymer (PDVB-IL).
- To evaluate the adsorptive performance of PDVB-IL for anionic azo dyes.
- To investigate the adsorption mechanism and influencing factors.
Main Methods:
- Synthesis of PDVB-IL from 1-aminoethyl-3-vinylimidazolium chloride and divinylbenzene.
- Characterization using Fourier transform infrared spectroscopy, scanning electron microscopy, and thermogravimetric analysis.
- Adsorption experiments with Orange II, Sunset Yellow FCF, and Amaranth dyes, studying pH, kinetics, and isotherms.
Main Results:
- PDVB-IL exhibited high maximum adsorption capacities: 925.09 mg/g for Orange II, 734.62 mg/g for Sunset Yellow FCF, and 547.17 mg/g for Amaranth at 25°C.
- Adsorption was favored at low pH values (1-8).
- Adsorption kinetics followed a pseudo-second-order model, and isotherms fitted the Langmuir model, indicating physisorption dominance.
Conclusions:
- The synthesized PDVB-IL is a highly efficient adsorbent for anionic azo dyes.
- The functional ionic liquid moieties integrated into the cross-linked polymer enhance adsorption performance.
- This material presents a promising solution for wastewater treatment and dye remediation.
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