Adsorption of Orange ۳R by chitosan modified montmorillonite nanocomposite

The objective of this research is to adsorbe Orange ۳R dye by a new catalyst chitosan-montmorillonite magnetic (CTS-MMT-Fe۳O۴) was used as an effective adsorbent for the adsorption of anions. In this research, the adsorption of Orange ۳R dye as an anionic sulphonated reactive azo dye, from aqueous solution by CTS-MMT-Fe۳O۴ 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 surface morphology. Adsorption experiments were conducted at room temperature in batch system. The effects of pH, initial concentration of dye, contact time and adsorbent dosage were investigated. Kinetic and equilibrium sorption parameters were evaluated pseudo-first and pseudo-second order rate models and Langmuir and Freundlich isotherms. The results indicated that the adsorption of dye onto adsorbent was better described by the pseudo second-order compared to by the pseudo-first-order. Also, the experimental data were better fitted to the Langmuir model with high R۲ value (R۲=۰.۹۹) than Freundlich model for adsorption. The thermodynamic studies showed that the adsorption is spontaneous and feasible. The present study indicated that CTS-MMT-Fe۳O۴ could be employed as an effectively adsorbent for the adsorption of Orange ۳R from industrial and other effluents.

کلیدواژه ها:

Adsorption kinetics ، Isotherm models ، Chitosan– montmorillonite magnetic ، Orange ۳R ، Thermodynamic parameter