Photooxidation of organic dye molecules on TiO2 and zinc-aluminum layered double hydroxide ultrathin multilayers

Robert Kun, Margit Balázs, I. Dékány

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

Multilayered self-assembling films from colloidal particles with constant or variable surface charge were prepared on the surface of glass plates using the "layer by layer" (LBL) technique. As particles with variable charge, TiO2 photocatalyst particles and silica sol particles were used for the preparation of multilayered, up to 20-layer films. The colloid particles with constant charge was a suspension of zinc-aluminum layer double hydroxide (ZnAl-LDH), 20 layers of which were deposited on the surface of glass plates using the LBL technique. Layer buildup was monitored by absorbance measurements at a wavelength of λ = 500 nm. The buildup of ZnAl-LDH layers was also followed by XRD measurements. Both TiO2 or TiO 2/SiO2 multilayered films and ZnAl-LDH multilayered films were shown to disintegrate acridine orange (AO) dye via photooxidation. The photocatalytic efficiency of ZnAl layer double hydroxide, the new photocatalyst we introduce is close to that of the well-known P25 Degussa titanium dioxide.

Original languageEnglish
Pages (from-to)155-162
Number of pages8
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume265
Issue number1-3
DOIs
Publication statusPublished - Sep 1 2005

Fingerprint

Photooxidation
photooxidation
Aluminum
hydroxides
Zinc
Multilayers
Coloring Agents
Dyes
zinc
dyes
Particles (particulate matter)
aluminum
Molecules
Photocatalysts
molecules
Glass
Acridine Orange
Colloids
Polymethyl Methacrylate
Surface charge

Keywords

  • Layered double hydroxide
  • Multilayered films
  • Photocatalysis
  • TiO

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

Photooxidation of organic dye molecules on TiO2 and zinc-aluminum layered double hydroxide ultrathin multilayers. / Kun, Robert; Balázs, Margit; Dékány, I.

In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 265, No. 1-3, 01.09.2005, p. 155-162.

Research output: Contribution to journalArticle

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