Abstract
The synthesized titanium dioxide nanoparticles (TiO2‐NPs) were used as adsorbent to remove reactive black 5 (RB 5) in aqueous solution. Various factors affecting adsorption of RB 5 aqueous solutions such as pH, initial concentration, contact time, dose of nanoparticles, and temperature were analyzed at fixed solid/solution ratio. Langmuir and Freundlich isotherms were used as model adsorption equilibrium data. Langmuir isotherm was found to be the most adequate model. The pseudo‐first‐order, pseudo‐second‐order, and intraparticle diffusion models were used to describe the adsorption kinetics. The experimental data was fitted to pseudo‐second‐order kinetics. The thermodynamic parameters such as Gibbs‐free energy, enthalpy, and entropy changes were determined. These parameters indicated the endothermic and spontaneity nature of the adsorption. The results demonstrated the fact that the TiO2‐NPs are promising adsorbent for the removal of RB 5 from aqueous solutions.
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