Hydrothermal synthesis of TiO 2 /SiO 2 hybrid photocatalyst from rice husk ash

P. Sujaridworakun, S. Jinawath, W. Panpa, A. Nakajima, Masahiro Yoshimura

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Photocatalyst materials were prepared as a hybrid between TiO 2 /SiO 2 via low temperature hydrothermal method (150°C) without further heat treatment. Porous silica from rice husk ash was used as a support for fine TiO 2 particles which acted as a photocatalyst when radiated with a UV light. TiO 2 -deposited SiO 2 was successfully prepared through hydrolysis of TiOSO 4 solution by controlling synthesis parameters such as pH ,concentration of TiOSO 4 , temperature and time under hydrothermal treatment. The obtained products were characterized for physical and chemical properties by means of XRD, XRF, BET and TEM . It was found that pH had an influence on the crystallization of TiO 2 , and under an appropriated pH, only anatase presented along with amorphous phase. High crystallinity of nano-crystalline anatase ( about 5 nm) deposited on silica surface was observed through TEM. Adsorption and photocatalytic performances of the prepared catalyst were evaluated in methylene blue aqueous solution in the dark and under ultraviolet ray irradiation, respectively. Due to the synergetic functions of adsorption by porous substrate and decomposition by TiO 2 photocatalyst, an enhancing of photocatalytic activity for decomposition of organic pollutants in water under UV rays was obtained.

Original languageEnglish
Pages (from-to)281-285
Number of pages5
JournalKey Engineering Materials
Volume352
DOIs
Publication statusPublished - 2007 Oct 1

Fingerprint

Ashes
Hydrothermal synthesis
Photocatalysts
Silicon Dioxide
Titanium dioxide
Silica
Transmission electron microscopy
Decomposition
Adsorption
Organic pollutants
Methylene Blue
Crystallization
Ultraviolet radiation
Chemical properties
Hydrolysis
Physical properties
Heat treatment
Irradiation
Crystalline materials
Temperature

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Sujaridworakun, P. ; Jinawath, S. ; Panpa, W. ; Nakajima, A. ; Yoshimura, Masahiro. / Hydrothermal synthesis of TiO 2 /SiO 2 hybrid photocatalyst from rice husk ash In: Key Engineering Materials. 2007 ; Vol. 352. pp. 281-285.
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Hydrothermal synthesis of TiO 2 /SiO 2 hybrid photocatalyst from rice husk ash . / Sujaridworakun, P.; Jinawath, S.; Panpa, W.; Nakajima, A.; Yoshimura, Masahiro.

In: Key Engineering Materials, Vol. 352, 01.10.2007, p. 281-285.

Research output: Contribution to journalArticle

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