Properties of TiO2 prepared by acid treatment of BaTiO3

Kiyoshi Okada, Tomoki Yanagisawa, Yoshikazu Kameshima, Akira Nakajima

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

TiO3 powders were prepared by acid treatment of BaTiO3 and their properties were investigated. The BaTiO3 powder was subjected to HNO3 in concentrations ranging from 10-3 to 8 M at 90 °C for 0.5-6 h. Dissolution of BaTiO3 and precipitation of TiO2 occurred at acid concentrations of 2-5 M. BaTiO3 dissolves completely to form a clear solution at reaction times of 0.5-1 h, but a rutile precipitate is formed after 2 h of acid treatment. By contrast, anatase is precipitated by adjusting the pH of the clear solution to 2-3 using NaOH or NH4OH solution. The rutile crystals were small and rod-shaped, consisting of many small coherent domains connected by grain boundaries with small inclination angles and edge dislocations, giving them a high specific surface area (SBET). With increasing HNO3 concentration, the SBET value increased from 100 to 170 m2/g while the crystallite size decreased from 25 to 11 nm. The anatase crystals obtained here were very small equi-axial particles with a smaller crystallite size than the rutile and SBET values of about 270 m2/g (higher than the rutile samples). The photocatalytic activity of these TiO2 was determined from the decomposition rate of Methylene Blue under ultraviolet irradiation. Higher decomposition rates were obtained with larger crystallite sizes resulting from heat treatment. The maximum decomposition rates were obtained in samples heated at 500-600 °C. The photocatalytic activity of the TiO2 was found to depend more strongly on the sample crystallite size than on SBET.

Original languageEnglish
Pages (from-to)1921-1929
Number of pages9
JournalMaterials Research Bulletin
Volume42
Issue number11
DOIs
Publication statusPublished - Nov 6 2007
Externally publishedYes

Fingerprint

Crystallite size
rutile
acids
Acids
Decomposition
decomposition
anatase
Titanium dioxide
Powders
Edge dislocations
Crystals
methylene blue
edge dislocations
reaction time
Specific surface area
crystals
inclination
Precipitates
precipitates
dissolving

Keywords

  • A. Ceramics
  • B. Chemical synthesis
  • C. X-ray diffraction
  • D. Catalytic properties

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Properties of TiO2 prepared by acid treatment of BaTiO3 . / Okada, Kiyoshi; Yanagisawa, Tomoki; Kameshima, Yoshikazu; Nakajima, Akira.

In: Materials Research Bulletin, Vol. 42, No. 11, 06.11.2007, p. 1921-1929.

Research output: Contribution to journalArticle

Okada, Kiyoshi ; Yanagisawa, Tomoki ; Kameshima, Yoshikazu ; Nakajima, Akira. / Properties of TiO2 prepared by acid treatment of BaTiO3 In: Materials Research Bulletin. 2007 ; Vol. 42, No. 11. pp. 1921-1929.
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N2 - TiO3 powders were prepared by acid treatment of BaTiO3 and their properties were investigated. The BaTiO3 powder was subjected to HNO3 in concentrations ranging from 10-3 to 8 M at 90 °C for 0.5-6 h. Dissolution of BaTiO3 and precipitation of TiO2 occurred at acid concentrations of 2-5 M. BaTiO3 dissolves completely to form a clear solution at reaction times of 0.5-1 h, but a rutile precipitate is formed after 2 h of acid treatment. By contrast, anatase is precipitated by adjusting the pH of the clear solution to 2-3 using NaOH or NH4OH solution. The rutile crystals were small and rod-shaped, consisting of many small coherent domains connected by grain boundaries with small inclination angles and edge dislocations, giving them a high specific surface area (SBET). With increasing HNO3 concentration, the SBET value increased from 100 to 170 m2/g while the crystallite size decreased from 25 to 11 nm. The anatase crystals obtained here were very small equi-axial particles with a smaller crystallite size than the rutile and SBET values of about 270 m2/g (higher than the rutile samples). The photocatalytic activity of these TiO2 was determined from the decomposition rate of Methylene Blue under ultraviolet irradiation. Higher decomposition rates were obtained with larger crystallite sizes resulting from heat treatment. The maximum decomposition rates were obtained in samples heated at 500-600 °C. The photocatalytic activity of the TiO2 was found to depend more strongly on the sample crystallite size than on SBET.

AB - TiO3 powders were prepared by acid treatment of BaTiO3 and their properties were investigated. The BaTiO3 powder was subjected to HNO3 in concentrations ranging from 10-3 to 8 M at 90 °C for 0.5-6 h. Dissolution of BaTiO3 and precipitation of TiO2 occurred at acid concentrations of 2-5 M. BaTiO3 dissolves completely to form a clear solution at reaction times of 0.5-1 h, but a rutile precipitate is formed after 2 h of acid treatment. By contrast, anatase is precipitated by adjusting the pH of the clear solution to 2-3 using NaOH or NH4OH solution. The rutile crystals were small and rod-shaped, consisting of many small coherent domains connected by grain boundaries with small inclination angles and edge dislocations, giving them a high specific surface area (SBET). With increasing HNO3 concentration, the SBET value increased from 100 to 170 m2/g while the crystallite size decreased from 25 to 11 nm. The anatase crystals obtained here were very small equi-axial particles with a smaller crystallite size than the rutile and SBET values of about 270 m2/g (higher than the rutile samples). The photocatalytic activity of these TiO2 was determined from the decomposition rate of Methylene Blue under ultraviolet irradiation. Higher decomposition rates were obtained with larger crystallite sizes resulting from heat treatment. The maximum decomposition rates were obtained in samples heated at 500-600 °C. The photocatalytic activity of the TiO2 was found to depend more strongly on the sample crystallite size than on SBET.

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