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RESEARCH PAPERS

The Effect of Modifying TiO2 on Catechol and Resorcinol Photocatalytic Degradation

[+] Author and Article Information
J. Araña1

Grupo de Fotocatálisis y Electroquímica Aplicada al Medio-Ambiente (FEAM), Unidad Asociada al Instituto de Ciencia de Materiales de Sevilla, C.S.I.C and CIDIA (Depto. de Química), Edificio del Parque Científico Tecnológico, Campus Universitario de Tafira, 35017, Las Palmas, España

J. M. Rodríguez, O. González Díaz, J. A. Melián, J. Pérez Peña.

Grupo de Fotocatálisis y Electroquímica Aplicada al Medio-Ambiente (FEAM), Unidad Asociada al Instituto de Ciencia de Materiales de Sevilla, C.S.I.C and CIDIA (Depto. de Química), Edificio del Parque Científico Tecnológico, Campus Universitario de Tafira, 35017, Las Palmas, España

1

Author to whom correspondence should be addressed.

J. Sol. Energy Eng 129(1), 80-86 (Nov 09, 2005) (7 pages) doi:10.1115/1.2391225 History: Received June 29, 2005; Revised November 09, 2005

The photocatalytic features of TiO2 doped with ferric oxides or mixed with activated carbon (AC-TiO2) are compared with those of the unmodified Degussa P-25 TiO2. These new catalysts show specific structural features that alter catechol and resorcinol photodegradabilities, according to their chemical structures. For instance, we have observed that Fe oxides located on the TiO2 particle surface hamper these dihydroxybenzenes degradation. Likewise, AC-TiO2 catalysts have shown improved catechol photodegradability with respect to that of TiO2, while that of resorcinol is not altered. These studies show that catechol and resorcinol adsorption patterns are different, i.e., they have different adsorption centres on the catalyst surface and are differently affected by photonic flux variations.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Catechol degradation at different irradiation powers using TiO2, AC-TiO2, or Fe-TiO2 after 60min of irradiation

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Figure 2

Resorcinol degradation at different irradiation powers using TiO2, AC-TiO2, or Fe-TiO2 after 60min of irradiation

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Figure 3

Catechol degradation at different irradiation powers in the presence of H2O2 using TiO2, AC-TiO2, or Fe-TiO2 after 30min of irradiation

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Figure 4

Resorcinol degradation at different irradiation powers in the presence of H2O2 using TiO2, AC-TiO2, or Fe-TiO2 after 30min of irradiation

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Figure 5

TOC mineralization during catechol and resorcinol degradation using TiO2 or TiO2+H2O2 after 60min of irradiation

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Figure 6

FTIR spectra: catechol reference (a) and catechol interactions with TiO2 (b), AC-TiO2 (c), and Fe-TiO2 (d) in the region between 2000–1000cm−1

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Figure 7

FTIR spectra: resorcinol reference (a) and resorcinol interactions with TiO2 (b), AC-TiO2 (c), and Fe-TiO2 (d) in the region between 2000-1000cm−1

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