Adsorption Behavior of Terephthalic Acid on TiO2 Nano Particles Synthesized by Thermal Hydrolysis Method

Abstract

Adsorption behavior of terephthalic acid (TPA) on TiO₂ nano particles and TiO₂- SiO₂composites synthesized by thermal hydrolysis (TH) method was examined. The adsorption behavior of TPA has been studied through batch experiments and using UV-spectrophotometric technique. The adsorption of equilibrium was reached within 30 min. The effect of initial TPA concentrations, contact time, catalyst loading and type were studied. The results showed that the amount of adsorbed TPA decrease with increasing catalyst loading. Also adsorbed amount of TPA increase with increasing initial TPA concentration. In addition, TiO₂- SiO₂composite is more effective for removal of TPA. The experimental isotherm data were analyzed using Langmuir and Freundlich equations. The fit of experimental isotherm data to Langmuir equations was good. The adsorption capacities and adsorption equilibrium constants have been determined, which are found to be 6.939, 2.847 mg/g and 0.117, 0.15 L/mg for TiO₂ (T95) and TiO₂- SiO₂composites (TS95), respectively.