ZnAl-layer double hydroxides as photocatalysts for oxidation of phenol in aqueous solution

Ágnes Patzkó, Robert Kun, Viktória Hornok, Imre Dékány, Thomas Engelhardt, Norbert Schall

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Abstract

ZnAl-layer double hydroxides (ZnAl-LDHs) with various Zn/Al ratios from 1:1 to 4:1 were prepared by the sol-gel method. The amount of ZnO in the layer double hydroxide was increased by the addition of more Zn hydroxide sol and Zn-oxide-hydroxide/2:1 ZnAl-LDH composites were prepared by heterocoagulation. The samples were calcinated at different temperatures (80-700°C) and it was shown by XRD and TG measurements that the crystallinity of the samples improves as temperature is increased. The photocatalytic properties of the heat-treated samples were studied in a batch reactor with aqueous phenol solution as substrate. The samples prepared from ZnAl-LDH were shown to have higher photocatalytic efficiencies at 3:1 and 4:1 Zn/Al ratios in the case of mixed phase double hydroxide and ZnO crystals.

Original languageEnglish
Pages (from-to)64-72
Number of pages9
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume265
Issue number1-3
DOIs
Publication statusPublished - Sep 1 2005

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Keywords

  • Layer double hydroxide
  • Phenol
  • Photocatalysis
  • Photooxidation
  • Zinc oxide

ASJC Scopus subject areas

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

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