花状TiO_2分级结构的可控合成与其光催化性能  

Controllable synthesis and photocatalytic properties of hierarchical flower-like TiO_2 nanostructure

作　　者：杜利霞[1,2] 吴志娇[1] 吴谦[1] 江潮[1] 朴玲钰[1] 

机构地区：[1]国家纳米科学中心,北京100190 [2]辽宁师范大学物理与电子技术学院,辽宁大连116029

出　　处：《催化学报》2013年第4期808-814,共7页

基　　金：科技部基础性工作专项(2011FY130104);国家科技支撑计划(2011BAK15B05);国家重点基础研究发展计划(973计划;2011CB932802)~~

摘　　要：采用水热法可控合成了花状TiO2分级结构材料,运用扫描电镜、透射电镜、X射线衍射、N2物理吸附-脱附等手段,对其进行了表征,系统研究了NaOH用量、H2O2浓度、HNO3浓度、反应温度及时间等因素对所得样品形貌的影响,并评价了它们的光催化性能.结果表明,花状TiO2分级结构为锐钛矿相,颗粒大小均一;随制备条件的变化,构成花状TiO2分级结构的基元结构分别为纳米线、纳米片,纳米线直径约25nm,纳米片厚度不足10nm;该样品具有较高的比表面积,表现出良好的单次光催化活性与重复使用性能.Hierarchical flower-like TiO2 nanostructure has been successfully synthesized via a modified hydrothermal technique. The effects of the concentrations of H2O2 , HNO3 , and NaOH, as well as the reaction temperature and time on the morphology of TiO2 have been studied. The morphology, microstructure, and specific surface area of the flower-like TiO2 structure were characterized by scanning electron micros- copy, transmission electron microscopy, X-ray diffraction, and surface area analysis. The photocatalytic activity of the TiO2 obtained under different conditions for degradation of methylene blue dye was investigated by ultraviolet light irradiation. The hierarchical flower-like ana- tase TiO2 nanostructure has a high specific surface area, and exhibits excellent activity in the photocatalytic degradation of methylene blue.

关 键 词：花状氧化钛 分级结构 水热合成 比表面积 光催化 

分 类 号：O643.36[理学—物理化学]