Glass beads coated with chitosan for the food azo dyes adsorption in a fixed bed column

Glass beads were coated with chitosan (GBCC) by dip-coating technique, and the effects of chitosan solution concentration and cure method were evaluated. GBCC were used for food azo dyes adsorption in a fixed bed column. The chitosan solution concentration of 0.5% and the physicochemical cure were the more suitable for the glass beads coating. The maximum capacity of the adsorption column ranged of 13.5–108.7 mg g−1 and the removal percentage ranged of 40.9–74.7%. Three dynamic models were used, and they showed adequate to represent the breakthrough curves. The column regeneration was possible for five adsorption–desorption cycles.