Resumo:
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.
