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

Chyow San Chiou, Kai Jen Chuang, Hua Wei Chen

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

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
Volume13
Issue number4
DOIs
Publication statusPublished - Apr 2013

Fingerprint

Photocatalysts
Waste Water
Calcination
roasting
Magnetic properties
Magnetometry
Thermodynamic properties
recovery
magnetic properties
Recovery
Temperature
Benzoic Acid
Fourier Transform Infrared Spectroscopy
Magnetic Fields
X-Ray Diffraction
catalysts
Suspensions
Wastewater
Hot Temperature
benzoic acid

Keywords

  • Benzoic acid
  • Characterisation
  • Magnetic
  • Photocatalysis
  • Separation

ASJC Scopus subject areas

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

Cite this

Influence of calcination temperature on structure, magnetic property, photocatalytic activity and recovery of recyclable photocatalysts. / Chiou, Chyow San; Chuang, Kai Jen; Chen, Hua Wei.

In: Journal of Nanoscience and Nanotechnology, Vol. 13, No. 4, 04.2013, p. 2974-2980.

Research output: Contribution to journalArticle

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