Chitosan modified with Reactive Blue 2 dye on adsorption equilibrium of Cu(II) and Ni(II) ions

摘要: Abstract This study aimed at immobilizing Reactive Blue 2 (RB 2) dye in chitosan microspheres through nucleophilic substitution reaction. The adsorbent chemical modification was confirmed by Raman spectroscopy and thermogravimetric analysis. adsorption carried out with Cu(II) Ni(II) ions indicated a pH dependence, while the maximum occurred around 7.0 8.5, respectively. pseudo second-order kinetic model resulted best fit experimental data obtained from ( R  = 0.997)  = 0.995), also providing rate constant, k , of 4.85 × 10 −4 3.81 × 10  g (mg min) −1 respectively, thus suggesting that metal chitosan-RB depends on concentration surface, as well their equilibrium. Langmuir Freundlich isotherm models were employed analysis for adsorption, form linearized equations. both metals 57.0 mg g (0.90 mmol g ) 11.2 mg g (0.19 mmol g Ni(II). desorbed aqueous solutions EDTA H SO 4