MESOPOROUS 1D TiO NANOSTRUCTURES OBTAINED BY THE 2 HYDROTHERMAL METHOD

Abstract

Mesoporous one dimensional nanostructures (1D) such as nanotubes/nanorods of TiO were 2 synthesized by alkaline hydrothermal treatment of TiO nanoparticles obtained by Sol Gel 2 process (SG-TiO ). The electronic microscopy images revealed the nanotubes formation of 2 approximately 8 nm in diameter and more than around 400 nm long after hydrothermal treatment of 18 h and 24 h. These tube-like structures were maintained after acid treatment but after annealing at 400 °C during 2 hours these turn into rod-like structures of crystalline TiO2 corresponding to anatase phase as revealed the diffraction patterns obtained by X-Ray Diffraction (XRD). The conversion of nanoparticles into nanotubes and afterward into rodlike shape was also confirmed by the variations in the BET surface area from 201, 269 and 97 2 m /g around, respectively. The adsorption-desorption isotherms also revealed hysteresis loop typical of mesoporous materials. These qualities are attractive to use these materials for the treatment of pollutants in water, for example.