The first study of adsorption of methylene blue by Black Titania (B-TiO2) nanoparticle in aqueous solution

This study investigates the elimination of Methylene Blue (MB) by adsorption on Black Titania (B-TiO2) in an aqueous solution in the dark room. B-TiO2 was prepared via the reduction of white TiO2 by NaBH4 in a tube furnace under an inert gas atmosphere at 600 degrees C. Characterization of the absorbent was carried out by XRay Diffraction (XRD), N-2 adsorption-desorption, Scanning Electron Microscopy (SEM) mapping, photoluminescence, Energy Dispersive X-ray spectrometry (EDX) analysis, Zeta potential, Dynamic Light Scattering (DLS), and Fourier Transform Infrared Spectrometer (FT-IR). The maximum adsorption capacity of B-TiO2 was found to be 88.65 mg g(-1). The rate-limiting step was the intra-particle diffusion stage. Maximum adsorption was observed under the following conditions: 26 mg of B-TiO2 at pH 6 and MB concentration of 10 mg L-1. It was demonstrated that B-TiO2 might be recycled six times with very good adsorption results while keeping its high removal efficiency. (c) 2023 Sharif University of Technology. All rights reserved.