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Cross-linked chitosan-epichlorohydrin/bentonite composite for reactive orange 16 dye removal: Experimental study and
Assia Benhouria1, H Zaghouane-Boudiaf2, Riadh Bourzami3
1Laboratoire de valorisation des matériaux (LVM), Université de Mostaganem, 27000 Mostaganem, Algeria.
International Journal of Biological Macromolecules
|May 11, 2023
Summary
Chitosan/bentonite beads effectively remove reactive orange 16 and methylene blue dyes. This composite adsorbent shows promising potential for wastewater treatment applications.
Area of Science:
- Materials Science
- Environmental Chemistry
- Adsorption Science
Background:
- Wastewater contamination by reactive dyes poses environmental risks.
- Development of efficient and cost-effective adsorbents is crucial for dye removal.
- Chitosan and bentonite are abundant natural materials with potential adsorbent properties.
Purpose of the Study:
- To synthesize and characterize chitosan/bentonite (CsB) composites for dye removal.
- To investigate the adsorption performance of CsB for reactive orange 16 (RO16) and methylene blue (MB).
- To explore the adsorption mechanism and thermodynamic properties of RO16 onto the optimal CsB composite.
Main Methods:
- Preparation and cross-linking of chitosan/bentonite beads (CsB) using epichlorohydrin.
- Characterization using SEM, EDX, FTIR, BET, and pHpzc.
- Adsorption experiments varying contact time, initial dye concentration, temperature, adsorbent dosage, ionic strength, and pH.
- Kinetic and isotherm modeling using pseudo-second-order and Langmuir models.
- Thermodynamic analysis and Monte Carlo simulations for mechanism elucidation.
Main Results:
- The Cs20B80 composite (20% chitosan, 80% bentonite) exhibited the highest adsorption capacity for both MB and RO16.
- Adsorption followed pseudo-second-order kinetics and Langmuir isotherm models.
- Maximum monolayer adsorption capacities for RO16 were 55.27, 55.29, and 70.80 mg/g at 30, 40, and 50 °C, respectively.
- The adsorption process was found to be endothermic and spontaneous.
- Monte Carlo simulations indicated favorable adsorption energies and revealed interactions including electrostatic forces, hydrogen bonding, and π-π interactions.
Conclusions:
- Cs20B80 composite is an effective adsorbent for RO16 and MB dyes.
- The adsorption mechanism involves physical interactions and is governed by Langmuir and pseudo-second-order models.
- The composite demonstrates potential for industrial wastewater treatment, though regeneration capacity needs further optimization.
