The Synthesis of Nano TiO 2 and Its Use for Removal of Lead Ions from Aqueous Solution

Abstract

In this study, nano-TiO2 particles were synthesized by sol-gel method. The synthesized nanoparticles were characterized by Fourier Transform Infrared (FT-IR), X-ray diffraction (XRD), Transmission electron microscope (TEM) and Brunauer-Emmett-Teller (BET). The results showed that the average size of TiO2 nanoparticles and their specific surface area were 21.1 nanometer and 55.35 m2/gr, respectively. The effects of several variables such as adsorbent weight, pH and contact time on lead ions adsorption were studied in batch experiments and finally the optimum conditions for lead ions adsorption by synthesized nano-TiO2 were obtained. The results showed that the synthesized nano TiO2 had a good capacity to adsorb lead ion. The kinetic data were described by pseudo-first and second-order models. Freundlich and Langmuir isotherm models were used for the analysis of equilibrium data, and results showed that the Langmuir model was suitable for describing the equilibrium data of lead ion adsorption by nano TiO2. Using the Langmuir isotherm, the maximum sorption capacity of Pb2+ was estimated to be 7.41 (mg/g) at 25&#176C.