Adsorption of Methyl Orange from aqueous solution by Surface modified TiO2 nanoparticles

Titanium dioxide nanoparticles surface-modified by 5-sulfosalicylic acid (5-SA-TiO2) were prepared in dehydrated ethanol at room temperature via the chemisorption process. The resulting products were characterized by X-ray diffraction (XRD) and Fourier transform infrared spectra (FTIR). The influences of surface modification on the adsorption of methyl orange (MO) were investigated in a batch system by considering the effects of various parameters, such as contact time, adsorbent dosage, pH and initial dye concentration. concentration and temperature. The equilibrium data have been analyzed using Langmuir, Freundlich and Temkin isotherms. The adsorption isotherm of MO onto surface-modified TiO2 nanoparticles fitted into the Temkin equation. The adsorption kinetics of MO was good fit with the pseudo-second-order kinetic model (R2 > 0.99). In addition, thermodynamic studies showed that the adsorption process was spontaneity

Keywords:

Methyl Orange , TiO2 nanoparticles , Surface-modification , 5-Sulfosalicylic acid