Preparation and Properties of N-doped and Oxygen-deficient TiO2 Photocatalyst

Chinese Journal of Materials Research

2013, Vol. 27

Issue (4): 404-410 DOI:

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Preparation and Properties of N-doped and Oxygen-deficient TiO₂ Photocatalyst

CHEN Jingling CAO Xiaoxin CHEN Yilin^** GAO Bifen LIN Bizhou

(College of Materials Science and Engineering, Huaqiao University, Xiamen 361021)

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CHEN Jingling CAO Xiaoxin CHEN Yilin** GAO Bifen LIN Bizhou. Preparation and Properties of N-doped and Oxygen-deficient TiO₂ Photocatalyst. Chinese Journal of Materials Research, 2013, 27(4): 404-410.

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Abstract N-doped and oxygen-deficient titanium dioxide was synthesized by heating TiO₂ in NH₃ atmosphere, followed by the post-calcination in H₂ for different time. The physicochemical properties of the products were characterized by X-ray diffraction (XRD), N₂-sorption BET surface area, X-ray photoelectron spectroscopy (XPS), elemental analysis (EA), electron spin resonance (ESR), UV-vis diffuse reflectance spectrum (UV-vis DRS) and photoluminescence spectrum (PL). The photocatalytic activity of catalysts was determined by the degradation of gas-phase benzene under visible light (λ > 400 nm) irradiation. Effect of the H₂ heat-treatment on the photocatalytic performance of the as-prepared catalysts was investigated. The results show that the N-doped TiO₂ post-heated in H₂atmosphere for 1 h exhibited the high photocatalytic activity. After photocatalytic oxidation for 5 h, the conversion rate and mineralization rate of benzene over the co-doped catalyst are up to 66.8% and 47.5%, respectively. The photocatalytic activity of the co-doped catalyst is much higher than that of the sums on N-doped TiO₂ and oxygen-deficient TiO₂. The enhanced photoactivity of the co-doped catalysts is related to a synergistic effect of N dopants and the oxygen vacancies in TiO₂ lattice.

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