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Photocatalytic Decomposition of 2,4-Dichlorophenoxyacetic Acid over Amorphous Titania Modified Pt(IV)under Visible Light
Sun Yufeng,Huang Xingjiu,Ye Gang,Wang Lianchao,Meng Fanli,Liu Wei,Liu Jinhuai*
Author NameAffiliationE-mail
Sun Yufeng Hefei Institute of Intelligent MachinesChinese Academy of SciencesHefei 230031Department of ChemistryUniversity of Science and Technology of ChinaHefei 230026  
Huang Xingjiu Hefei Institute of Intelligent MachinesChinese Academy of SciencesHefei 230031 Department of ChemistryUniversity of Science and Technology of ChinaHefei 230026  
Ye Gang Department of ChemistryUniversity of Science and Technology of ChinaHefei 230026  
Wang Lianchao Department of ChemistryUniversity of Science and Technology of ChinaHefei 230026  
Meng Fanli Hefei Institute of Intelligent MachinesChinese Academy of SciencesHefei 230031  
Liu Wei Hefei Institute of Intelligent MachinesChinese Academy of SciencesHefei 230031  
Liu Jinhuai* Hefei Institute of Intelligent MachinesChinese Academy of SciencesHefei 230031 jhliu@mail.lim.ac.cn 
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,黄行九,叶刚,王连超,孟凡利,刘伟,刘锦淮*
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: