Citation: LI Ai-Chang, LI Gui-Hua, ZHENG Yan, FENG Ling-Ling, ZHENG Yan-Jun. Photocatalytic Property and Reaction Mechanism of (Ni-Mo)/TiO₂ Nano Thin Film Evaluated with Con Red[J]. Acta Physico-Chimica Sinica, ;2012, 28(02): 457-464. doi: 10.3866/PKU.WHXB201112081 shu

Photocatalytic Property and Reaction Mechanism of (Ni-Mo)/TiO₂ Nano Thin Film Evaluated with Con Red

1.
Faculty of Chemistry and Material Science, Langfang Teachers College, Langfang 065000, Hebei Province, P. R. China

Received Date: 16 September 2011
Available Online: 8 December 2011
Fund Project: 河北省科技支撑计划项目(11276732)资助 (11276732)

(Ni-Mo)/TiO₂ composite thin films were prepared by composite electroplating at a constant current. The surface morphology, phase structure, and optical characteristics of the thin films were analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectrum, and ultravioletvisible diffuse reflectance spectroscopy (UV-Vis DRS), respectively. The photocatalytic properties of the (Ni-Mo)/TiO₂ composite thin films were evaluated with Con red as a model compound. The effects of pH of the Con red aqueous solution on the photocatalytic activity of the (Ni-Mo)/TiO₂ thin films were investigated. Using cyclic voltammetry technique and a method of adding active species scavengers to the solution, the mechanisms of photocatalytic degradation of the films were explored. The results show that the (Ni-Mo)/TiO₂ films consist of crystalline grains of TiO₂ in the size range of 50-100 nm and nanocrystalline grains of Ni-Mo in solid solution. The (Ni-Mo)/TiO₂ films are photocatalytically more active than a TiO₂/ITO (indium tin oxide) reference film. Under halogen light irradiation, the photocatalytic degradation rate of the (Ni-Mo)/TiO₂ films is 2.43 times as much as that of a porous TiO₂ (Degussa P25)/ ITO film. The improvement in photocatalytic activity for the composite films could be mainly attributed to the heterojunction of (Ni-Mo)/TiO₂, the electronic passageway of Ni-Mo in the composite films, and the catalysis of Ni-Mo in the composite film for the reaction of excited electrons with dissolved oxygen. The photocatalytic reaction mechanisms of the (Ni-Mo)/TiO₂ films evaluated with Con red are given under visible and UV light irradiation, respectively.
- Photocatalysis,
- (Ni-Mo)/TiO₂ nanofilm,
- Composite electroplating,
- Co n red,
- Reaction mechanism
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沈阳化工大学材料科学与工程学院沈阳 110142

Photocatalytic Property and Reaction Mechanism of (Ni-Mo)/TiO2 Nano Thin Film Evaluated with Con Red

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Photocatalytic Property and Reaction Mechanism of (Ni-Mo)/TiO₂ Nano Thin Film Evaluated with Con Red