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Topics in Catalysis

, Volume 54, Issue 8–9, pp 496–503 | Cite as

Photocatalytic Degradation of Phenol with Fe-Titania Catalysts

  • Edgar Moctezuma
  • Brenda Zermeño
  • Elvira Zarazua
  • Leticia M. Torres-Martínez
  • Ricardo García
Original Paper

Abstract

Iron titanate (FeTiO3) obtained from rich titanium and iron mineral presented some absorption of UV light and photocatalytic activity for the degradation of phenol in aqueous solution. However, most of the reactant is converted to carboxylic acids that remain in the reaction mixture because natural ilmenite do not produce enough HO radicals to completely mineralize the original reactant at the same rate as pure titania (Degussa P25). The XRD analysis of Fe-titania catalysts prepared by simple mixing of FeTiO3 and TiO2 showed that the structure of TiO2 is not modified when small amounts of FeTiO3, in the order of 10% weight, are well mixed with pure titania. Therefore, the photocatalytic activity of these catalysts is not affected by the presence of FeTiO3. But, heavy ilmenite particles induce the separation of the catalysts particles after the photocatalytic degradation processes.

Keywords

Photocatalysis Phenol Ilmenite TiO2 

List of Symbols

BQ

Benzoquinone

BT

Benzenetriol

CT

Catechol

e

Free electrons

EDTA

Ethylene diamine tetra acetic acid

Eg

Semiconductor energy band gap

h+

Electron holes

HO

Hydroxyl radicals HO

HPLC

High-performance liquid chromatography

HQ

Hydroquinone

O2•−

Superoxide radical-anions

PH

Phenol

SCC

Semiconductor catalyst

TiO2

Titanium dioxide

TOC

Total organic carbon

XRD

X ray diffraction

BQt

Benzoquinone concentration (mM)

BTt

Benzene-triol concentration (mM)

CO2PH

Phenol mineralized to carbon dioxide (mM)

CTt

Catechol concentration (mM)

HQt

Hydroquinone concentration (mM)

IIOPt

Total concentration of identified intermediate organic products (mM)

NIOPt

Total concentration of non identified intermediate organic products (mM)

PHt

Phenol concentration (mM)

PHzero

Initial phenol concentration (mM)

TOCPH

Total organic carbon concentration in terms of phenol concentration (mM)

TOCt

Total organic carbon concentration (mM)

TOCzero

Initial total organic carbon concentration (mM)

Notes

Acknowledgments

The authors gratefully acknowledge the financial support of CONACyT (Project 103532-2009), Universidad Autónoma de San Luis Potosí (Grant C06-FAI-11-26.63) and Secretaría de Educación Publica de México (Grant PromeP-Cuerpos Académicos). The technical assistance of Dr. Rafael Barbosa and Dr. Alfredo Aguíllon of is gratefully appreciated.

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Edgar Moctezuma
    • 1
  • Brenda Zermeño
    • 1
    • 2
  • Elvira Zarazua
    • 3
  • Leticia M. Torres-Martínez
    • 3
  • Ricardo García
    • 2
  1. 1.Facultad de Ciencias QuímicasUniversidad Autónoma de San Luis PotosíSan Luis PotosíMéxico
  2. 2.División de Estudios de PosgradoInstituto Tecnológico de Ciudad Madero, Juventino Rosas y Jesús UretaTampsMéxico
  3. 3.Departamento de Ecomateriales y Energía, Facultad de Ingeniería CivilUniversidad Autónoma de Nuevo LeónSan Nicolás de los GarzaMéxico

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