Effects of phosphate modification on the structure and surface properties of ordered mesoporous SnO2

László Krösi, Szilvia Papp, Szabolcs Beke, Albert Oszkó, Imre Dékány

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

A series of ordered mesoporous phosphate-modified SnO2 samples (mP-SnO2) with varying P content were synthesized in a template-assisted sol-gel process, with the use of hexadecylpyridinium chloride as structure-directing agent. In order to enhance the thermal stability, sol-gel derived SnO2×nH2O was treated with H3PO4 at room temperature. The bulk and surface compositions of mP-SnO2 were studied by means of inductively coupled plasma atomic emission spectroscopy, diffuse reflectance infrared Fourier transform spectroscopy, and X-ray photoelectron spectroscopy. Elemental analysis revealed that the mesostructured hybrid network adsorbed a significant amount of phosphate during the H3PO4 treatment. The measured atomic ratio P:Sn of the powder samples varied between 0.08 and 0.45. After calcination at 600°C, both the unmodified mesoporous SnO2 (mSnO2) and mP-SnO2 with low P content (P:Sn<0.275) exhibited a disordered porous structure. However, samples with higher phosphate contents preserved their ordered structures even after calcination at 600°C. The specific surface areas of these mP-SnO2 samples were in the range 310-350m2g-1, whereas that of the mSnO2 was 30m2g-1.

Original languageEnglish
Pages (from-to)79-86
Number of pages8
JournalMicroporous and Mesoporous Materials
Volume134
Issue number1-3
DOIs
Publication statusPublished - Oct 1 2010

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Keywords

  • Phosphoric acid
  • Surface modification
  • Template-assisted sol-gel
  • Thermal stability
  • Tin dioxide

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

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