单分散Au、TiO_2和Au/TiO_2量子点的制备及催化性能研究  

Study on preparation and catalytic activity of Au,TiO_2 and Au / TiO_2 monodisperse quantum dots

作　　者：赵涛 史智锋 贺慧 董蔚 张骥 

机构地区：[1]西安诺博尔稀贵金属材料有限公司,陕西西安710065

出　　处：《化学研究与应用》2015年第2期151-156,共6页Chemical Research and Application

基　　金：国家自然科学基金项目(51102022)资助

摘　　要：本文通过一步水热法分别制备了Au、TiO2和Au/TiO2量子点。采用TEM和XRD测试手段对形貌、尺寸分布及组成进行了表征。结果表明,所得的Au、TiO2和Au/TiO2分别为近似球形,棒状和球形棒状交错的分散良好,没有团聚的纳米粒子,其尺寸峰值分别在3 nm、5 nm和4 nm左右,晶粒分布窄,为单分散量子点。Au量子点为面心立方结构,TiO2为典型锐钛矿结构,而Au/TiO2为兼有Au和TiO2两种结构。CO被催化为CO2的研究表明Au和Au/TiO2量子点对其均具有较高催化活性,且催化活性随着温度升高而增强。Au/TiO2复合物量子点的催化性能好于Au量子点,60℃便可以将CO完全氧化为CO2。TiO2和Au/TiO2量子点在甲基橙的降解反应中均具有较高的活性,在紫外光照射下均可在较短时间内将甲基橙完全降解,但负载型的Au/TiO2量子点降解效果更好。In this paper,Au、TiO2 and Au / TiO2 quantum dots were prepared by hydrothermal method with one step,respectively. The morphology,size distribution and component of samples were characterized by TEM and XRD. The results indicated that Au、TiO2 and Au / TiO2 quantum dots were approximately spherical,rod like and sphere-rod hybrid,respectively. And they were well dispersed nanoparticles with no aggregation. They all have a narrow distribution with peak size of 3,5 and 4 nm,respectively. Au quantum dots had the structure of face-centered cubic,TiO2 had the typical structure of anabases,while Au / TiO2 had the structure of both Au and TiO2. The investigation of catalysis indicated both Au and Au / TiO2 quantum dots had high catalytic activity for CO,and catalytic activity enhanced as the temperature increased. The catalytic activity of Au / TiO2 was better than Au,thus CO could be oxidized completely to CO2 at 60℃ 。Both TiO2 and Au / TiO2 quantum dots had high catalytic activity for methyl orange which would be degraded completely in a short time under UV light. But Au / TiO2 with load type had better degradation effect。

关 键 词：水热法 量子点 AU CO催化 光催化 

分 类 号：O611.4[理学—无机化学]