Study of the Photocatalytic Performance of Oxygen-deficient TiO2 Active in Visible Light

doi:10.3724/SP.J.1077.2012.12097

Abstract

Abstract: Oxygen-deficient titanium dioxide (TiO_2-x) was prepared by heating TiO₂ in H₂ atmosphere, followed by the post-calcination in O₂ at different temperatures. The physicochemical properties of the products were characterized by X-ray photoelectron spectroscope (XPS), electron spin resonance (ESR), UV-Vis diffuse reflectance spectrum (UV-Vis DRS) and photoluminescence spectrum (PL). The photocatalytic activity of the as-prepared samples was determined by the degradation of gas-phase benzene under visible light (λ > 400 nm) irradiation. The results show that the TiO_2-x post-heated at 300℃ exhibits the highest photocatalytic activity. After photocatalytic oxidation for 4 h, the conversion rate of benzene over the catalyst is up to 36.9% at steady state, which is 5.3 times as much as that on the untreated sample. The enhanced photocatalytic performance of the TiO_2-x is related to the amount of the oxygen vacancies in matrix (single-electron-trapped oxygen vacancies). The postcalcination successfully reduces the surface oxygen vacancies (Ti³⁺), efficiently hindering the photoinduced carriers from recombination.

Key words: oxygen vacancy, TiO₂, visible light, photocatalysis

CLC Number:

O643

CAO Xiao-Xin, CHEN Yi-Lin, LIN Bi-Zhou, GAO Bi-Fen. Study of the Photocatalytic Performance of Oxygen-deficient TiO₂ Active in Visible Light[J]. Journal of Inorganic Materials, 2012, 27(12): 1301-1305.

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Study of the Photocatalytic Performance of Oxygen-deficient TiO₂ Active in Visible Light

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