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Experimental and theoretical study of dyes adsorption process on chitosan-based cryogel
A García-González1, Rosa E Zavala-Arce1, P Avila-Pérez1
1Tecnológico Nacional de México/Instituto Tecnológico de Toluca, Av. Tecnológico s/n. Colonia Agrícola Bellavista, C.P. 52149 Metepec, Edo. De México, Mexico.
International Journal of Biological Macromolecules
|December 18, 2020
Summary
Chitosan cryogel beads effectively adsorb synthetic dyes from water, with adsorption influenced by pH and temperature. Dye uptake is primarily driven by physisorption and mass transfer, with electrostatic interactions playing a key role.
Area of Science:
- Environmental Science
- Materials Science
- Chemical Engineering
Background:
- Synthetic dyes pose environmental challenges due to their persistence and toxicity.
- Wastewater treatment requires efficient and cost-effective dye removal methods.
- Chitosan-based materials show promise as adsorbents for pollutants.
Purpose of the Study:
- To compare the adsorption capacity of chitosan cryogel beads (Q-C-EGDE) for three synthetic dyes.
- To investigate the influence of solution pH and temperature on dye adsorption.
- To analyze adsorption kinetics, isotherms, and underlying mechanisms.
Main Methods:
- Adsorption experiments were conducted using Blue 1, Red 2, and Yellow 5 dyes.
- Solution pH, temperature (283.15 K, 303.15 K, 323.15 K) effects were studied.
- Biosorbent characterization using SEM, BET, and FTIR; kinetic and isotherm modeling; Monte Carlo simulation.
Main Results:
- Chitosan cryogel beads exhibited macroporous structures with low surface area.
- Adsorption capacity followed the order: Blue 1 > Red 2 > Yellow 5 (1600 mg/L to 850 mg/L).
- Amino groups (NH3+) were the primary functional groups involved in adsorption.
Conclusions:
- Dye adsorption is mainly governed by physisorption and mass transfer limitations within the cryogel.
- Electrostatic interactions significantly influence the adsorption process.
- The study provides insights into the use of chitosan cryogels for dye removal from aqueous solutions.
