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Efficient adsorption removal of anionic dyes by an imidazolium-based mesoporous poly(ionic liquid) including the
Ju Lin1, Tiezhu Su1, Jiawen Chen1
1College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China.
Chemosphere
|January 19, 2021
Summary
A novel mesoporous poly(ionic liquid), PDVIm-Cl, demonstrates exceptional capacity for removing anionic dyes from water. This material offers high efficiency, reusability, and a unique adsorption mechanism, surpassing previous benchmarks.
Area of Science:
- Materials Science
- Environmental Chemistry
- Polymer Chemistry
Background:
- Wastewater contamination by anionic dyes poses significant environmental and health risks.
- Effective and sustainable dye removal technologies are crucial for industrial effluent treatment.
- Existing adsorbents often face limitations in capacity, reusability, or efficiency across varying conditions.
Purpose of the Study:
- To synthesize and characterize a novel mesoporous poly(ionic liquid), PDVIm-Cl.
- To evaluate the adsorption performance of PDVIm-Cl for various anionic dyes.
- To investigate the practical applicability, reusability, and adsorption mechanism of PDVIm-Cl.
Main Methods:
- Synthesis of mesoporous poly(N,N'-methylene-bis(1-(3-vinylimidazolium)) chloride) (PDVIm-Cl).
- Batch adsorption experiments with anionic dyes (AO7, SY, RB19, CR) under varying conditions (pH).
- Kinetic and isotherm modeling (pseudo-second-order, Langmuir-Freundlich).
- Column adsorption and desorption studies.
- Adsorption mechanism exploration using quantum chemical calculations.
Main Results:
- PDVIm-Cl exhibited superior adsorption ability for anionic dyes due to its mesoporous structure and positively charged imidazole rings.
- Achieved a record high adsorption capacity for Reactive Blue 19 (2605 ± 254 mg g⁻¹).
- Demonstrated high removal efficiencies across a wide pH range (2-10) and excellent reusability in a continuous column process.
- Adsorption followed pseudo-second-order kinetics and Langmuir-Freundlich isotherms.
Conclusions:
- PDVIm-Cl is a highly effective adsorbent for anionic dyes, offering unprecedented adsorption capacity.
- The material shows significant potential for practical wastewater treatment applications due to its efficiency, wide pH applicability, and reusability.
- Adsorption mechanism involves a combination of ion exchange, electrostatic interactions, hydrogen bonding, and π-π stacking.
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