Adsorption of Reactive Black 5 on Synthesized Titanium Dioxide Nanoparticles: Equilibrium Isotherm and Kinetic Studies

Abstract EN

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.