Sol-hydrothermal Preparation and Characterization of Gd-N-TiO2 Nano-photocatalyst with Visible Light Response

doi:10.3724/SP.J.1095.2013.20302

Chinese Journal of Applied Chemistry

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Sol-hydrothermal Preparation and Characterization of Gd-N-TiO₂ Nano-photocatalyst with Visible Light Response

WANG Qingyuan, JIANG Hongquan^*, LI Jingshen, WANG Qiaofeng, LI Zhenyu

(Key Laboratory of Design and Synthesis of Functional Materials and Green Catalysis,
Colleges of Heilongjiang Province,Harbin Normal University,Harbin 150025,China)

Received:2012-07-09 Revised:2012-08-27 Published:2013-05-10 Online:2013-05-10
Contact: Jiang HongQuan

Abstract

Abstract: Un-doped, N-doped, Gd-doped and Gd-N-codoped TiO2 nano-photocatalysts were successfully prepared by a sol-hydrothermal method. Their photocatalytic activities were evaluated by photocatalytic decoloration of methyl orange dye in aqueous solution under UV and visible light irradiation, respectively. The physicochemical properties of as-prepared samples were characterized by XRD, XPS, BET, UV-Vis and PL analytic techniques. The effect of Gd-N-codoping on the photoactivity of TiO2 was also discussed. The results showed that Gd-doping could effectively inhibit the recombination of photogenerated electronhole pairs, then enhancing photo quantum efficiency. Gd-doping could inhibit the growth of crystalline size and improve the surface textural properties. Therefore, the UV photoactivity was obviously enhanced by Gd-doping. N-doping could make the absorption edge red-shift to visible light range by narrowing the electronic band structure, which enhanced the visible light photoactivity. Gd-N-codoping could further increase the absorption to visible light by narrowing the electronic band structure, and further decrease the crystalline size and improve the surface textural properties, therefore increasing the thermal stability. Compared to the single-doped TiO2, Gd-N-TiO2 significantly improved the photoactivity for decoloring methyl orange in aqueous solution under visible light irradiation, which was ascribed to the synergetic effect of Gd-N-codoping.

Key words: nano-TiO2, Gd-N-codoping, sol-hydrothermal, visible light response, synergetic effect

CLC Number:

O643.3

WANG Qingyuan, JIANG Hongquan*, LI Jingshen, WANG Qiaofeng, LI Zhenyu. Sol-hydrothermal Preparation and Characterization of Gd-N-TiO₂ Nano-photocatalyst with Visible Light Response[J]. Chinese Journal of Applied Chemistry, DOI: 10.3724/SP.J.1095.2013.20302.

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Sol-hydrothermal Preparation and Characterization of Gd-N-TiO₂ Nano-photocatalyst with Visible Light Response

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