A novel approach to mesoporous anatase TiO2

Oxidation of TiC by nitric acid

Dong Lin Shieh, Jr Sheng Li, Ming Jr Shieh, Jong-Liang Lin

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

TiO2 has been prepared by a novel, mild one-step reaction between TiC and aqueous HNO3 at 70 °C. This material possesses an anatase crystal form and a narrow pore-size distribution of mesoporous channels. The BET surface area, average pore diameter, and total pore volume are 332.7 m2/g, 3.28 nm, and 0.23 cm3/g, respectively. Our method is a template-free synthesis process, distinct from sol-gel methods for mesoporous TiO2 fabrication using structure-directing surfactants or polymers. TiO2 is not generated from TiC reacting with other acids and oxidants, such as HCl, H2SO4, H3PO4, KMnO4, K2Cr2O7, Na2S2O7, H2O2, and Na2CrO4, at a similar reaction condition. Since the average particle size of the mesoporous TiO2 produced is much larger than that of the TiC starting material, the mechanism for the formation of the mesoporous TiO2 is not via mesopore-etching of TiC particles and transformation of TiC pore walls into TiO2 by HNO3. It is likely that TiC is first transformed into TimXn species, followed by hydrolysis to form mesoporous TiO2.

Original languageEnglish
Pages (from-to)339-343
Number of pages5
JournalMicroporous and Mesoporous Materials
Volume98
Issue number1-3
DOIs
Publication statusPublished - 2007 Jan 5

Fingerprint

Nitric Acid
nitric acid
Nitric acid
anatase
Titanium dioxide
Potassium Dichromate
porosity
Oxidation
oxidation
Oxidants
Surface-Active Agents
Sol-gel process
Pore size
Etching
Hydrolysis
Polymers
Surface active agents
Particle size
Fabrication
Crystals

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Materials Science(all)

Cite this

Shieh, Dong Lin ; Li, Jr Sheng ; Shieh, Ming Jr ; Lin, Jong-Liang. / A novel approach to mesoporous anatase TiO2 : Oxidation of TiC by nitric acid. In: Microporous and Mesoporous Materials. 2007 ; Vol. 98, No. 1-3. pp. 339-343.
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A novel approach to mesoporous anatase TiO2 : Oxidation of TiC by nitric acid. / Shieh, Dong Lin; Li, Jr Sheng; Shieh, Ming Jr; Lin, Jong-Liang.

In: Microporous and Mesoporous Materials, Vol. 98, No. 1-3, 05.01.2007, p. 339-343.

Research output: Contribution to journalArticle

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N2 - TiO2 has been prepared by a novel, mild one-step reaction between TiC and aqueous HNO3 at 70 °C. This material possesses an anatase crystal form and a narrow pore-size distribution of mesoporous channels. The BET surface area, average pore diameter, and total pore volume are 332.7 m2/g, 3.28 nm, and 0.23 cm3/g, respectively. Our method is a template-free synthesis process, distinct from sol-gel methods for mesoporous TiO2 fabrication using structure-directing surfactants or polymers. TiO2 is not generated from TiC reacting with other acids and oxidants, such as HCl, H2SO4, H3PO4, KMnO4, K2Cr2O7, Na2S2O7, H2O2, and Na2CrO4, at a similar reaction condition. Since the average particle size of the mesoporous TiO2 produced is much larger than that of the TiC starting material, the mechanism for the formation of the mesoporous TiO2 is not via mesopore-etching of TiC particles and transformation of TiC pore walls into TiO2 by HNO3. It is likely that TiC is first transformed into TimXn species, followed by hydrolysis to form mesoporous TiO2.

AB - TiO2 has been prepared by a novel, mild one-step reaction between TiC and aqueous HNO3 at 70 °C. This material possesses an anatase crystal form and a narrow pore-size distribution of mesoporous channels. The BET surface area, average pore diameter, and total pore volume are 332.7 m2/g, 3.28 nm, and 0.23 cm3/g, respectively. Our method is a template-free synthesis process, distinct from sol-gel methods for mesoporous TiO2 fabrication using structure-directing surfactants or polymers. TiO2 is not generated from TiC reacting with other acids and oxidants, such as HCl, H2SO4, H3PO4, KMnO4, K2Cr2O7, Na2S2O7, H2O2, and Na2CrO4, at a similar reaction condition. Since the average particle size of the mesoporous TiO2 produced is much larger than that of the TiC starting material, the mechanism for the formation of the mesoporous TiO2 is not via mesopore-etching of TiC particles and transformation of TiC pore walls into TiO2 by HNO3. It is likely that TiC is first transformed into TimXn species, followed by hydrolysis to form mesoporous TiO2.

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