Synthesis of TiO2 particles was made by sol-gel technique assisted of ultrasonic radiationfrom an alcoholic solution of titanium isopropoxide. Then was subjected to a heat treatmentin air at 350 °C for 1 h. X-ray diffraction and transmission electron microscopy confirmedthat the size of the crystalline domains is between 10 and 37 nm. Infrared spectroscopy studyconfirms the presence of -OH groups on the surface of TiO2. Modification of the morphologyand surface area, due to the influence of exposure time to the ultrasonic radiation, is evidencedby studies of SEM and BET respectively. Properties of TiO2 obtained were studied bymonitoring 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 largerthe constant velocity for the photocatalytic reaction for the methyl orange.

The present study has as main objecuve the search of new materials, among them the porous materials whose diversity of pore diameter confers lO the same specific properties, those that in turn determine a series of applications like adsorbents. catalysts, and shield materials, among others. The investigatíon consists of the synthes1s of macroporous materials by the method Sol-Gel, using reactive of low cost as sodium silicate (silicon source) and includes/understanos the following stages: 1) control of hydrolysis of the inorganic precursors: 2) formatíon oí the rnacrostructure material (hydrothermal synthesis) and 3) elimination of the organic matter by calcinations. The structural characterization and the degree of crystalinidad were made by means of Diffraction of Rays-X (DRX) and Electronic Diffraction of Area Selecta.(DEAS), whereas the morphologic analysis was made through an Ele...

The present study has as main objecuve the search of new materials, among them the porous materials whose diversity of pore diameter confers lO the same specific properties, those that in turn determine a series of applications like adsorbents. catalysts, and shield materials, among others. The investigatíon consists of the synthes1s of macroporous materials by the method Sol-Gel, using reactive of low cost as sodium silicate (silicon source) and includes/understanos the following stages: 1) control of hydrolysis of the inorganic precursors: 2) formatíon oí the rnacrostructure material (hydrothermal synthesis) and 3) elimination of the organic matter by calcinations. The structural characterization and the degree of crystalinidad were made by means of Diffraction of Rays-X (DRX) and Electronic Diffraction of Area Selecta.(DEAS), whereas the morphologic analysis was made through an Ele...