Abstract
In this research work, a hybrid organic-inorganic magnetic nanocomposite of magnetic chitosan-ethylene glycol diglycidyl ether/magnesium oxide (CS-EGDE/MgO/Fe3O4) was prepared as a bioadsorbent material for dye wastewater treatment (reactive blue 19, RB 19). A response surface methodology (RSM) was adopted for the design of 29 experiments to investigate the effect of four factors [A: CS-EGDE/MgO/Fe3O4 dose (0.02-0.1 g), B: pH (4-10), C: temperature (30-60 degrees C), and time D: (20-80 min)] related to the adsorption of RB 19. The Freundlich adsorption isotherm and the pseudo-second-order kinetics model favourably describe the adsorption of RB 19 by CS-EGDE/MgO/Fe3O4. The CS-EGDE/MgO/Fe3O4 nanocomposite showed a maximum absorption capacity of 133.8 mg/g with the RB 19 dye at 45 degrees C. The adsorption mechanism for CS-EGDE/MgO/Fe3O4-RB 19 dye system involves electrostatic attraction, H- bonding, n-pi interaction, and Yoshida H-bonding. This study supports that the nanocomposite system is an efficient bioadsorbent, which can be deployed for effective decontamination of water that contains acidic dye species.