Equilibrium, Kinetics and Thermodynamic of methyl orange adsorption onto the chitosan/montmorillonite nanocomposite

Chitosan-montmorillonite (CTS–MMT) was used as an effective adsorbent for the adsorption of anions. In this research, the adsorption of methyl orange dye as an anionic sulphonated azo dye, from aqueous solution by CTS–MMT nanocomposite was investigated. The synthesized nanocomposite was characterized by FTIR (Fourier transform infrared), XRD (X-Ray diffraction) and SEM (Scanning Electron Microscopy) to evaluate the morphology. Adsorption experiments were performed at room temperature in batch system. The effects of pH, initial concentration of dye, contact time and adsorbent dose were studied. Kinetic and equilibrium sorption parameters were evaluated pseudo-first and pseudo-second rate models and Langmuir and Freunlich equations. The results indicated that the adsorption of methyl orange dye onto CTS-MMT can be best described by pseudo second-order model. Also, the adsorption data well fitted to Langmuir and Freundlich isotherms.

کلیدواژه ها:

Adsorption kinetics ، Isotherms model ، Chitosan–montmorillonite nanocomposite ، methyl orange ، Thermodynamic parameter