Size dependent photocatalytic activity of hydrothermally crystallized titania nanoparticles on poorly adsorbing phenol in absence and presence of fluoride ion

Paola Calza, Ezio Pelizzetti, K. Mogyorósi, Robert Kun, I. Dékány

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

The photocatalytic degradation of phenol has been performed by adopting nanosized titanium dioxide, prepared with the sol-gel method, both in presence and absence of fluoride ions. Several catalyst treatments, that is hydrothermal heat treatment and calcination, have been applied in order to increase the crystallinity of the particles. A close relationship was found between the rate of phenol disappearance and the particle size, with an efficiency that becomes maximum when the combination of large particle size (7.8 nm) and surficial sites covered by fluoride is fulfilled. Intermediates profiles have been also evaluated, in order to verify if the surficial process occurring in the diverse materials still remains the same. It is accomplished in the case of the fluorinated titania, where both the rate of disappearance and the intermediates formation closely resemble those seen on Degussa P25, while a different formation ratio between catechol and hydroquinone was observed in the case of naked titania.

Original languageEnglish
Pages (from-to)314-321
Number of pages8
JournalApplied Catalysis B: Environmental
Volume72
Issue number3-4
DOIs
Publication statusPublished - Mar 30 2007

Fingerprint

Phenol
Fluorides
fluoride
titanium
Phenols
phenol
Titanium
Particle size
particle size
Ions
Nanoparticles
ion
crystallinity
Calcination
Titanium dioxide
Sol-gel process
gel
catalyst
Heat treatment
Degradation

Keywords

  • Photocatalysis
  • Size dependence
  • Sol-gel method
  • Titanium dioxide

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology
  • Environmental Chemistry

Cite this

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title = "Size dependent photocatalytic activity of hydrothermally crystallized titania nanoparticles on poorly adsorbing phenol in absence and presence of fluoride ion",
abstract = "The photocatalytic degradation of phenol has been performed by adopting nanosized titanium dioxide, prepared with the sol-gel method, both in presence and absence of fluoride ions. Several catalyst treatments, that is hydrothermal heat treatment and calcination, have been applied in order to increase the crystallinity of the particles. A close relationship was found between the rate of phenol disappearance and the particle size, with an efficiency that becomes maximum when the combination of large particle size (7.8 nm) and surficial sites covered by fluoride is fulfilled. Intermediates profiles have been also evaluated, in order to verify if the surficial process occurring in the diverse materials still remains the same. It is accomplished in the case of the fluorinated titania, where both the rate of disappearance and the intermediates formation closely resemble those seen on Degussa P25, while a different formation ratio between catechol and hydroquinone was observed in the case of naked titania.",
keywords = "Photocatalysis, Size dependence, Sol-gel method, Titanium dioxide",
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T1 - Size dependent photocatalytic activity of hydrothermally crystallized titania nanoparticles on poorly adsorbing phenol in absence and presence of fluoride ion

AU - Calza, Paola

AU - Pelizzetti, Ezio

AU - Mogyorósi, K.

AU - Kun, Robert

AU - Dékány, I.

PY - 2007/3/30

Y1 - 2007/3/30

N2 - The photocatalytic degradation of phenol has been performed by adopting nanosized titanium dioxide, prepared with the sol-gel method, both in presence and absence of fluoride ions. Several catalyst treatments, that is hydrothermal heat treatment and calcination, have been applied in order to increase the crystallinity of the particles. A close relationship was found between the rate of phenol disappearance and the particle size, with an efficiency that becomes maximum when the combination of large particle size (7.8 nm) and surficial sites covered by fluoride is fulfilled. Intermediates profiles have been also evaluated, in order to verify if the surficial process occurring in the diverse materials still remains the same. It is accomplished in the case of the fluorinated titania, where both the rate of disappearance and the intermediates formation closely resemble those seen on Degussa P25, while a different formation ratio between catechol and hydroquinone was observed in the case of naked titania.

AB - The photocatalytic degradation of phenol has been performed by adopting nanosized titanium dioxide, prepared with the sol-gel method, both in presence and absence of fluoride ions. Several catalyst treatments, that is hydrothermal heat treatment and calcination, have been applied in order to increase the crystallinity of the particles. A close relationship was found between the rate of phenol disappearance and the particle size, with an efficiency that becomes maximum when the combination of large particle size (7.8 nm) and surficial sites covered by fluoride is fulfilled. Intermediates profiles have been also evaluated, in order to verify if the surficial process occurring in the diverse materials still remains the same. It is accomplished in the case of the fluorinated titania, where both the rate of disappearance and the intermediates formation closely resemble those seen on Degussa P25, while a different formation ratio between catechol and hydroquinone was observed in the case of naked titania.

KW - Photocatalysis

KW - Size dependence

KW - Sol-gel method

KW - Titanium dioxide

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