Imobilização de TiO2 em concreto

Abstract

Santos, Valquiria Claret dos. Immobilization of TiO2 in concrete. Master Degree in Materials Engineering, Federal University of Itajubá, 2004, 105p, Master’s Degree Dissertation. Titanium dioxide immobilization on concrete was studied using mixtures with cement, varnish and resin for the destruction of organic compounds. Chloroform (CHCl3) and phenol were employed as test organic compounds. The sources of UV radiation used were a germicide UV lamp and solar light. The photodegradation was performed in a system using a channel containing immobilized TiO2. Solutions of 10 and 20 µg.L-1 of CHCl3 and 10-2 mol.L-1 of phenol were prepared and forced to circulate over the channel using a peristaltic pump. The obtained results showed that the surfaces containing immobilized TiO2 showed better photocatalytic efficiency for phenol degradation than compared to the control. For the degradation of CHCl3, the presence or not of the catalyst did not cause any significant difference to its degradation efficiency. For the surface analysis it was observed that the rugosity were not directly related to the adsorption results. The micrographic results showed a more homogeneous surface for the ones containing immobilized TiO2 in resin and varnish.