Sun Yufeng, Huang Xingjiu, Ye Gang, Wang Lianchao, Meng Fanli, Liu Wei, Liu Jinhuai. Photocatalytic Decomposition of 2,4-Dichlorophenoxyacetic Acid over Amorphous Titania Modified Pt(IV)under Visible Light[J]. Chinese Journal of Chemical Physics , 2004, 17(1): 66-69. doi: 10.1088/1674-0068/17/1/66-69
Citation: Sun Yufeng, Huang Xingjiu, Ye Gang, Wang Lianchao, Meng Fanli, Liu Wei, Liu Jinhuai. Photocatalytic Decomposition of 2,4-Dichlorophenoxyacetic Acid over Amorphous Titania Modified Pt(IV)under Visible Light[J]. Chinese Journal of Chemical Physics , 2004, 17(1): 66-69. doi: 10.1088/1674-0068/17/1/66-69

Photocatalytic Decomposition of 2,4-Dichlorophenoxyacetic Acid over Amorphous Titania Modified Pt(IV)under Visible Light

doi: 10.1088/1674-0068/17/1/66-69
Funds:  Project supported by the National Natural Science Foundation of China(60274061).
  • Received Date: 2003-01-14
  • Amorphous microporous metal oxides of titanium(AMM-Ti)which can induce photocatalytic reactions under visible light irradiation was prepared by using Na2PtCl6 according to the sol-gel procedure affording high specific surface areas of 160-200 m2/g. The most active photocatalysts contained 3.0% P(t Ⅳ). According to extended X-ray absorption fine structure(EXAFS)results,isolated PtCl4 molecules were homogeneously distributed in an almost exclusively amorphous matrix of titania. During the photocatalytic degradation of 2,4-dichlorophenoxyacetic acid(2,4-D)in aqueous solution containing a suspension of AMM-Ti,it was found that 2,4-dichlorophenol was the major intermediate. The initial rate of photo-degradation was studied as a function of the initial concentration of reactants by the linearised form of the Langmuir-Hinshelwood equation,by which rate constants k and equilibrium adsorption constants K were evaluated. The postulated charge separation mechanism at Pt (Ⅳ)/ AMM-Ti and photocatalytic degradation mechanism of 2,4-D were also proposed.
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Photocatalytic Decomposition of 2,4-Dichlorophenoxyacetic Acid over Amorphous Titania Modified Pt(IV)under Visible Light

doi: 10.1088/1674-0068/17/1/66-69
Funds:  Project supported by the National Natural Science Foundation of China(60274061).

Abstract: Amorphous microporous metal oxides of titanium(AMM-Ti)which can induce photocatalytic reactions under visible light irradiation was prepared by using Na2PtCl6 according to the sol-gel procedure affording high specific surface areas of 160-200 m2/g. The most active photocatalysts contained 3.0% P(t Ⅳ). According to extended X-ray absorption fine structure(EXAFS)results,isolated PtCl4 molecules were homogeneously distributed in an almost exclusively amorphous matrix of titania. During the photocatalytic degradation of 2,4-dichlorophenoxyacetic acid(2,4-D)in aqueous solution containing a suspension of AMM-Ti,it was found that 2,4-dichlorophenol was the major intermediate. The initial rate of photo-degradation was studied as a function of the initial concentration of reactants by the linearised form of the Langmuir-Hinshelwood equation,by which rate constants k and equilibrium adsorption constants K were evaluated. The postulated charge separation mechanism at Pt (Ⅳ)/ AMM-Ti and photocatalytic degradation mechanism of 2,4-D were also proposed.

Sun Yufeng, Huang Xingjiu, Ye Gang, Wang Lianchao, Meng Fanli, Liu Wei, Liu Jinhuai. Photocatalytic Decomposition of 2,4-Dichlorophenoxyacetic Acid over Amorphous Titania Modified Pt(IV)under Visible Light[J]. Chinese Journal of Chemical Physics , 2004, 17(1): 66-69. doi: 10.1088/1674-0068/17/1/66-69
Citation: Sun Yufeng, Huang Xingjiu, Ye Gang, Wang Lianchao, Meng Fanli, Liu Wei, Liu Jinhuai. Photocatalytic Decomposition of 2,4-Dichlorophenoxyacetic Acid over Amorphous Titania Modified Pt(IV)under Visible Light[J]. Chinese Journal of Chemical Physics , 2004, 17(1): 66-69. doi: 10.1088/1674-0068/17/1/66-69

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