Abstract
New modified chitosan nano-montmorillonite composites were synthesized for efficient removal of Methylene Blue (MB) pollutant. The composites' structure and morphology were confirmed by 1H NMR, FTIR, TGA, SEM, XRD, XPS, water regain, stability in acidic medium, and pHpzc. Factors influencing dye adsorption; nano-montmorillonite ratio, initial dye concentration, composite dose, pH, temperature, contact time, and desorption were investigated. The new modified composites showed very fast adsorption performance and equilibrium occurred after 8 min with adsorption capacity 248.9, 276.03, 204.39, and 180 mg/g for R0, RI, RII, and RIII respectively. MB adsorption is a multilayer process preceded via electrostatic attraction in alkaline medium and/or cation exchange in acidic medium. Adsorption data is well-fitting to Freundlich isotherm and pseudo-second-order kinetics. The composites prepared showed high desorption ability amounting to 77.13, 84.28, 88.47, and 97% for R0, RI, RII, and RIII respectively by using 0.5 M HCl eluent.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
