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Optimization of Chitosan Glutaraldehyde-Crosslinked Beads for Reactive Blue 4 Anionic Dye Removal Using a Surface
Johanna Galan1, Jorge Trilleras2, Paula A Zapata3
1Grupo de Investigación Ciencias, Educación y Tecnología-CETIC, Programa de Química, Universidad del Atlántico, Carrera 30 No 8-49, Puerto Colombia 081008, Colombia.
Life (Basel, Switzerland)
|January 28, 2021
Summary
Industrial dye pollution is a major environmental and health concern. This study optimized chitosan (CS) beads crosslinked with glutaraldehyde (GA) for effective removal of Reactive Blue 4 (RB4) dye from wastewater, demonstrating a chemisorption mechanism.
Area of Science:
- Environmental Science
- Materials Science
- Chemical Engineering
Background:
- Industrial dye effluents pose significant environmental and health risks, including reduced aquatic photosynthesis, carcinogenicity, and mutagenicity.
- Chitosan (CS), a polysaccharide with a positive charge, shows promise for adsorbing anionic dyes like Reactive Blue 4 (RB4).
Purpose of the Study:
- To optimize the formulation of glutaraldehyde (GA)-crosslinked chitosan (CS) beads for efficient adsorption of RB4 dye.
- To investigate the adsorption mechanism and determine optimal conditions for dye removal from aqueous solutions.
Main Methods:
- Response Surface Methodology (RSM) was employed to optimize CS concentration, GA concentration, and NaOH concentration for bead swelling.
- RSM was also used to optimize RB4 dye adsorption based on solution pH, initial dye concentration, and adsorbent dose.
- Characterization of crosslinked beads involved Scanning Electron Microscopy (SEM), Fourier Transformed Infrared Spectroscopy (FTIR), and X-ray Diffractometry (XRD).
Main Results:
- Optimized concentrations for bead swelling were CS (3.3% w/v), GA (1.7% v/v), and NaOH (1.3 M), with practical application using CS at 3.0% w/v.
- Optimal adsorption conditions for RB4 dye were determined as pH 2, adsorbent dose 0.6 g, and initial dye concentration of 5 mg/L.
- Adsorption kinetics and isotherm studies indicated that the process is primarily governed by chemisorption interactions.
Conclusions:
- Glutaraldehyde-crosslinked chitosan beads are effective for removing RB4 dye from aqueous solutions.
- The optimized adsorbent and conditions demonstrate significant potential for wastewater treatment applications targeting similar dye structures.
