Photocatalysis on silver-layer silicate/titanium dioxide composite thin films at solid/vapour interface

Judit Ménesi, Renáta Kékesi, A. Oszkó, Volker Zöllmer, Torben Seemann, André Richardt, I. Dékány

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Silver-montmorillonite/TiO2 composites were prepared using various mixing ratios. The optical properties of the catalyst composites were evaluated DR-UV-vis spectrophotometry. Their photocatalytic efficiencies were tested in the degradation of ethanol vapour at a relative humidity of ∼70% in a closed circulating reactor. Light sources used were 15 W lamps, one rich in UV (λ ≥ 254 nm) and one emitting visible light (λ ≥ 435 nm). The course of photodegradation of ethanol vapour was monitored by gas chromatography. By incorporating silver ions into clay minerals/TiO2 mixtures with different ratio, we obtained composites capable of degrading ethanol in the visible wavelength range about twice as fast as the reference photocatalyst, type P25. The synergistic effect is interpreted as the result of the excellent adsorption capabilities of layer silicates combined with the advantageous effect of silver nanoparticles and silver oxides on light absorption in the visible range.

Original languageEnglish
Pages (from-to)160-165
Number of pages6
JournalCatalysis Today
Volume144
Issue number1-2
DOIs
Publication statusPublished - Jun 15 2009

Fingerprint

Photocatalysis
Composite films
Silver
Titanium dioxide
Silicates
Ethanol
Vapors
Clay minerals
Thin films
Composite materials
Silver oxides
Bentonite
Photodegradation
Spectrophotometry
Photocatalysts
Electric lamps
Gas chromatography
Light absorption
Light sources
Atmospheric humidity

Keywords

  • Layer silicates
  • Photocatalysis
  • Silver-montmorillonite
  • Titania-clay composites

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

Cite this

Photocatalysis on silver-layer silicate/titanium dioxide composite thin films at solid/vapour interface. / Ménesi, Judit; Kékesi, Renáta; Oszkó, A.; Zöllmer, Volker; Seemann, Torben; Richardt, André; Dékány, I.

In: Catalysis Today, Vol. 144, No. 1-2, 15.06.2009, p. 160-165.

Research output: Contribution to journalArticle

Ménesi, Judit ; Kékesi, Renáta ; Oszkó, A. ; Zöllmer, Volker ; Seemann, Torben ; Richardt, André ; Dékány, I. / Photocatalysis on silver-layer silicate/titanium dioxide composite thin films at solid/vapour interface. In: Catalysis Today. 2009 ; Vol. 144, No. 1-2. pp. 160-165.
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