Resumo

MARTINEZ ROJAS, Vanessa C. et al. Production of Ti O₂ particles by sol-gel ultrasound assisted for photocatalytic applications. Rev. Soc. Quím. Perú [online]. 2015, vol.81, n.3, pp.201-211. ISSN 1810-634X.

Synthesis of TiO₂ particles was made by sol-gel technique assisted of ultrasonic radiation from an alcoholic solution of titanium isopropoxide. Then was subjected to a heat treatment in air at 350 °C for 1 h. X-ray diffraction and transmission electron microscopy confirmed that the size of the crystalline domains is between 10 and 37 nm. Infrared spectroscopy study confirms the presence of -OH groups on the surface of TiO₂. Modification of the morphology and surface area, due to the influence of exposure time to the ultrasonic radiation, is evidenced by studies of SEM and BET respectively. Properties of TiO2 obtained were studied by monitoring the degradation of solutions of methyl orange in the presence of UV-A radiation. It was observed that larger the ultrasonic radiation exposure during the TiO₂ synthesis larger the constant velocity for the photocatalytic reaction for the methyl orange.

Palavras-chave : titanium dioxide; ultrasound; photocatalysis; methyl orange.

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