HR: 1340h
AN: B33C-1436    [Abstracts]
TI: Photocatalytic properties of Small Sized TiO2 Supported on Clays for the Degradation of Indoor Pollutants: Toluene and Limonene.
AU: * Kibanova, D
AF: Facultad de Quimica, Universidad Nacional Autonoma de Mexico, Ciudad Universitaria, Coyoacan, Mexico City, D.F 04510, Mexico
AU: * Kibanova, D
AF: instituto de Geografia, Universidad Nacional Autonoma de Mexico, Ciudad Universitaria, Coyoacan, Mexico City, D.F 04510, Mexico
AU: Trejo, M
AF: Facultad de Quimica, Universidad Nacional Autonoma de Mexico, Ciudad Universitaria, Coyoacan, Mexico City, D.F 04510, Mexico
AU: Destaillats, H
AF: Environmental Technologies Environmental Technologies Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States
AU: Cervini-Silva, J
EM: jcervini@igg.unam.mx
AF: instituto de Geografia, Universidad Nacional Autonoma de Mexico, Ciudad Universitaria, Coyoacan, Mexico City, D.F 04510, Mexico
AB: Novel materials for the degradation of hydrophobic organic pollutants by photocatalytic oxidation were developed. Intercalation of TiO2 on clays provide favorable properties to the photocatalyst due to the adsorption properties of the clay, its content of mesopores that enables pollutant trapping and its further interaction with TiO2, leading to mineralization. Particularly, we are interested in hydrophobic pollutants for which bare TiO2 had been shown less effective than for polar species. Synthesis was carried out by the sol-gel method using titanium isopropoxide (Ti(OC3H7)4 ) as precursor; the formation of anatase phase was achieved by hydrothermal treatment. Clays used were Hectorite [SHCa-1, Na0.4Mg2.7Li0.3Si4O10(OH)2 ] from San Bernardino Country, California, USA and Kaolinite [KGa-1b, Al2Si2O5(OH)4 ] from Washington Country, Georgia, USA. Samples characterization was conducted using XRD, SEM, XPS, ICP-OES. Our results showed a strong intercalation of TiO2 on hectorite and a poor one on kaolinite. Nanoparticle size obtained on hectorite was of 9.6 nm compared to 17.39 nm of commercial TiO2 (Degussa P25). Photocatalytic experiments were realized by the FTIR-ATR technique monitoring the concentration of the organic compound on the surface of the material. Results were compared with commercial TiO2 (Degussa P25). For limonene bare TiO2 showed better degradation rates, while for toluene, degradation rates using TiO2 supported on clays were higher.
DE: 0471 Oxidation/reduction reactions (4851)
DE: 0495 Water/energy interactions (1878)
DE: 1011 Thermodynamics (0766, 3611, 8411)
SC: Biogeosciences [B]
MN: 2007 Fall Meeting