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Nonlinear Kinetics and Isotherm Modeling of Rhodamine B Adsorption onto Al2O3 Decorated Laponite
Lütfi Erden1, İlyas Deveci2, Hanife Erden3
1Çanakkale Onsekiz Mart University, Can Vocational School, Department of Electricity and Energy, Çanakkale 17400, Türkiye.
This study developed a modified Laponite adsorbent using CTAB and Al2O3 for Rhodamine B (RhB) dye removal. The optimized material achieved over 92% RhB removal efficiency, demonstrating its effectiveness for wastewater treatment.
Area of Science:
- Materials Science
- Environmental Chemistry
- Nanotechnology
Background:
- Persistent cationic dyes like Rhodamine B (RhB) pose environmental challenges.
- Laponite, a synthetic clay, exhibits gelation issues and requires surface modification for enhanced functionality.
- Al2O3-decorated Laponite offers potential for adsorptive dye removal.
Purpose of the Study:
- To synthesize and characterize Al2O3-decorated Laponite using CTAB for RhB adsorption.
- To optimize adsorption conditions using Central Composite Design (CCD).
- To investigate the adsorption kinetics, isotherms, and thermodynamics of RhB removal.
Main Methods:
- Two-step modification of Laponite with CTAB followed by Al2O3 decoration.
- Characterization using BET surface area analysis.
- Optimization of adsorption parameters (initial concentration, dosage, contact time) via CCD.
- Kinetic, isotherm, and thermodynamic modeling.
Main Results:
- Modified Laponite exhibited a BET surface area of 237.1 m²/g and increased mesopore volume.
- Optimal conditions yielded >92% RhB removal efficiency.
- Elovich and Toth models best described the adsorption kinetics and isotherms, respectively.
- Adsorption was endothermic and spontaneous at higher temperatures.
Conclusions:
- CTAB/Al2O3-modified Laponite is a highly effective adsorbent for Rhodamine B removal.
- The modification process successfully addressed Laponite's limitations and enhanced its adsorptive properties.
- This material shows significant potential for treating dye-contaminated wastewater.
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