Biosorption of victoria blue using Zizyphus oenoplia seed: Evaluation of experimental and modeling studies

The present study predicts the feasibility for the adsorptive removal of Victoria Blue dye (VB dye) from aqueous solution using a low cost biosorbent Zizyphus Oenoplia seed (ZOS). In this study, a batch mode adsorption experiments were carried out using various parameters such as pH, contact time, concentration of dye, adsorbent dosage and temperature. The feasibility of the process is evaluated with various modeling isotherm equations like Freundlich, Langmuir and dimensionless separation factor (RL). The kinetics of the biosorption process is evaluated by using pseudo-first order and pseudo-second order equations. The mode of diffusion of biosorption was evaluated with intraparticle diffusion model equation. The thermodynamic parameters like change in enthalpy (ΔHo); change in entropy (ΔSo) and Gibbs free energy change (ΔGo) are calculated using Van't Hoff plot. The biosorbent material was characterized with Fourier Transform Infrared (FTIR) spectroscopy and the morphology of the adsorbent material was analysed with Scanning Electron Microscope (SEM) in before and after adsorption of VB dye.