掺铂有机钛柱撑膨润土复合材料的吸附和光催化性能研究  

The adsorption performance and photocatalytic activity of Pt_TiO_2 pillared clays composite modified by surfactants

作　　者：陈嘉鑫[1] 安太成[1] 袁建梅[2] 李桂英[1] 丁雪军[1] 陈慧[2] 盛国英[1] 傅家谟[1] 

机构地区：[1]中国科学院广州地球化学研究所有机地球化学国家重点实验室广东省环境资源利用与保护重点实验室 [2]西北师范大学化学化工学院,甘肃兰州730070

出　　处：《岩石矿物学杂志》2006年第6期505-510,共6页Acta Petrologica et Mineralogica

基　　金：国家自然科学基金资助项目(40302013);广东省自然科学基金资助项目(030466);广东省十五"重大科技攻关项目(2005A30401001).

摘　　要：采用阳离子表面活性剂十六烷基三甲基溴化铵对临安膨润土进行改性修饰,以钛酸丁酯和K2PtCl6为前驱体,利用掺有不同量铂的TiO2溶胶对改性膨润土进行反应,制得一系列掺铂有机钛柱撑膨润土复合材料。测定了复合材料的BET比表面积,利用X射线粉末衍射(XRD)、扫描电子显微镜(SEM)和能量分散光谱(EDS)等手段对其微观结构进行了表征。以甲基橙染料为目标污染物,考察了复合材料的吸附能力和光催化活性。实验结果表明,掺铂的有机钛柱撑膨润土复合材料比未掺铂的复合材料具有较好的层状结构,且对甲基橙的吸附能力较佳。由于铂能够充当捕获载流子的陷阱,能够有效抑制TiO2光生电子空穴的复合,所以掺铂有机钛柱撑膨润土复合材料具有更好的光催化性能,其中掺铂量为0·2%的复合材料的光催化活性最佳,对甲基橙的降解效果最好。Pt TiO2 pillared clays were prepared by the Sol gel method at a certain ratio of Ti （OC4H9）4 to CH3COOH modified by cationic surfactant cetyltrimethyl ammonium bromide （CTMAB）. These composite catalysts were prepared by adding surfactant first, and then pillared with TiO2 sol solution which was prepared in different Pt contents. Scanning electron microscopy （SEM）, X-ray diffraction （XRD） and energy dispersive spectrometry （EDS） were used to investigate the texture of prepared catalysts, and their BET surface areas were also measured. The adsorption and photocatalytic performance of prepared pillared clays were studied by using methyl orange（MO） as a mode organic pollutant. The result indicated that the catalysts obtained layered structures. And the different adsorptions with different contents of Pt were observed. Moreover, me conclusion is reached that Pt can act as separation centers which capture the photogenerated electrons and make a longer electron-hole pair separation lifetime, So it is found that different photocatalytic properties can be enhanced by preparing the catalyst with different Pt contents. An optimal content of 0.2 % Pt can achieve the best photocatalytic performance of MO.

关 键 词：铂掺杂 二氧化钛 柱撑粘土 甲基橙 光催化 

分 类 号：P578.967[天文地球—矿物学] P579[天文地球—地质学]