Influence of calcination temperature on structure, magnetic property, photocatalytic activity and recovery of recyclable photocatalysts

Chyow San Chiou, Kai Jen Chuang, Hua Wei Chen

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2 Citations (Scopus)


The photocatalytic oxidation of titanium dioxide is conducted in a suspension of submicrometersized particles, and an additional separation step is required to recover these catalyst particles from treated water, which presents a major drawback in treating wastewater. In this study, magnetic photocatalysts of spinel structure Fe3O4 coated with SiO2 and TiO2 by employing various heat treatments were synthesized and their characterization was carried out by thermogravimetric analysis, X-ray diffraction, vibrating sample magnetometry, and Fourier transform infrared spectroscopy. Furthermore, the reaction behavior in photocatalytic processes involving photocatalysts of porous composite for treating wastewater were analyzed to enhance their activity and recovery. The results showed that the calcination temperatures of the magnetic photocatalysts significantly affect their properties, i.e., rutile ratio, magnetization, surface area, and photocatalytic activity. The photocatalytic activity of these catalysts was measured using the decomposition of benzoic acid, which can be well modeled by the Langmuir-Hinshelwood kinetic equation. Furthermore, because of the paramagnetic behaviors of the prepared TiO2/SiO2/Fe 3O4, these magnetic photocatalyst could be easily recovered by applying a magnetic field.

Original languageEnglish
Pages (from-to)2974-2980
Number of pages7
JournalJournal of Nanoscience and Nanotechnology
Issue number4
Publication statusPublished - Apr 2013



  • Benzoic acid
  • Characterisation
  • Magnetic
  • Photocatalysis
  • Separation

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Chemistry(all)
  • Materials Science(all)
  • Bioengineering
  • Biomedical Engineering

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