Abstract

CABRERA, Julieta et al. Mesoporous 1D TiO₂ nanostructures obtained by the hydrothermal method. Rev. Soc. Quím. Perú [online]. 2014, vol.80, n.4, pp.262-269. ISSN 1810-634X.

Mesoporous one dimensional nanostructures (1D) such as nanotubes/nanorods of TiO₂ were synthesized by alkaline hydrothermal treatment of TiO₂ nanoparticles obtained by Sol Gel process (SG-TiO₂). The electronic microscopy images revealed the nanotubes formation of 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 m²/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.

Keywords : BET surface area; hydrothermal method; mesoporous 1D TiO₂ nanostructures.

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