Sorption of methylene blue on iodate-chitosan assembled composite from aqueous solution

This study focused on the synthesis of chitosan composite using potassium iodate, KIO3 for the adsorption of methylene blue (MB) in water. The physicochemical properties of the obtained adsorbent were characterized by Brunauer-Emmett-Teller (BET) surface area technique, Fourier transform infrared (FTIR) spectroscopy, scanning electron microscope (SEM) and X-ray diffraction (XRD). The effect of adsorption parameters such as adsorbent dosage, initial concentration, pH and temperature are systematically explored via adsorption batch method. The experimental results showed that the adsorption process was spontaneous and exothermic in nature and kinetically and isothermally fitted pseudo-second order kinetic and Langmuir models, respectively. In addition, the estimated maximum monolayer adsorption capacity of I-IC was 109 mg/g. The reuse ability of the I-IC was established with 3 successive cycles of adsorption-desorption. This indicates that the I-IC can be used as a low-cost and effective adsorbent for dye treatment in water.