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Photocatalytic Decomposition of 2,4-Dichlorophenoxyacetic Acid over Amorphous Titania Modified Pt(IV)under Visible Light
Sun Yufeng1,2, Huang Xingjiu1,2, Ye Gang2, Wang Lianchao2, Meng Fanli1, Liu Wei1, Liu Jinhuai*1
1.Hefei Institute of Intelligent Machines,Chinese Academy of Sciences,Hefei 230031;2.Department of Chemistry,University of Science and Technology of China,Hefei 230026
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.
Key words:  Amorphous material,Photocatalytic,Titania,Modification
FundProject:
Pt(IV)修饰的非晶态TiO2对2,4-二氯苯氧基乙酸的可见光降解
孙宇峰1,2, 黄行九1,2, 叶刚2, 王连超2, 孟凡利1, 刘伟1, 刘锦淮*1
1.中国科学院合肥智能机械研究所,合肥 230031;2.中国科学技术大学化学系,合肥 230026
摘要:
用溶胶-凝胶法制备了在可见光照射下具有光催化活性的掺杂P(t Ⅳ)离子的非晶态微孔TiO2,表面积为160~200 m2/g;含3.0%Pt(Ⅳ)的AMM-Ti具有最大的光催化活性. X射线精细结构分析(EXAFS)表明,单个的PtCl4分子均匀地分布在非晶态二氧化钛表面;用这种光催化剂降解2,4-二氯苯氧基乙酸时,2,4-二氯苯酚是主要的中间物,通过Langmuir-Hinshelwood 方程的线性形式估算了反应速率常数k 和吸附平衡常数K,研究了光催化起始反应速率和反应物起始浓度之间的关系,同时,提
关键词:  非晶态材料  光催化  TiO2  掺杂
DOI:10.1088/1674-0068/17/1/66-69
分类号: