模板法合成三维菊花状TiO_2纳米花及其性能  

Template synthesis and the properties of three-dimensional chrysanthemum-like TiO_2 nanoflowers

作　　者：李宣东[1] 付丽[1] 刘惠玲[2] 王炎[3] 文爱花[1] 刘臣娟 

机构地区：[1]哈尔滨工业大学理学院,哈尔滨150001 [2]哈尔滨工业大学市政环境工程学院,哈尔滨150090 [3]哈尔滨工业大学基础与交叉科学研究院,哈尔滨150010

出　　处：《哈尔滨工业大学学报》2014年第2期55-60,共6页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金资助项目(51178138;2127305)

摘　　要：为了解决一维、二维纳米材料在降解有机污染物时,易发生团聚、催化活性低、难以回收利用等问题,以TiO2(P25)和NaOH为原料,ZnO为模板,采用水热法合成了三维菊花状TiO2纳米花.运用扫描电子显微镜、X射线衍射仪、氮气吸附脱附、紫外-可见漫反射、傅立叶红外等手段对合成的样品进行测试分析.结果表明:其花瓣是由TiO2纳米颗粒通过自组装定向排列而成的链状结构,构成纳米花的粒子晶粒尺寸约15 nm,花状结构尺寸约为5μm,结晶性良好,为锐钛矿相;比表面积为102.3 m2/g,平均孔径为17.41 nm;以亚甲基蓝为目标污染物,在紫外光照射下对其进行光催化性能实验,80 min亚甲基蓝的降解率为98%,催化活性高于P25,显示出较强的光催化活性.To solve the problem of agglomeration, low catalytic activity and difficulty to recycle and utilize of the l-D, 2-D nanomaterials during the process of degradating organic pollutants.3-D TiO2 nanoflowers with chrysanthemum structure were prepared by template hydrothermal method in which TiO2（ P25 ）and NaOH as raw materials, with assistance of ZnO nanostructure templates. Petals in nanoflowers were self-assembled and arranged directionally by TiO2 nanoparticles. The TiO2 nanoilowers was characterized by scanning electron microscopy （ SEM ）, X-ray diffraction （ XRD ）, nitrogen adsorption-desorption, ultraviolet-visibles diffuse reflectance sepctroscopy （UV-vis DRS） , Fourier transform infrared （FTIR）. The SEM images indicated that TiO2 nanoflowers were chrysanthemum shape and average particle size was 5 μm. Self-assembled nanoflower of the diameter of the nanoparticles was about 15 nm. It was confirmed by XRD that the TiO2 nanoflowers was pure anatase crystalline structure with good crystallinity. The N2 adsorption-stripping isotherm results showed that specific surface area was 102.3 mE/g and average pore size is about 17.41 rim. Methylene blue as the target pollutant, the photocatalytic degradation of methylene blue rate in 80 minutes could reach 98% under UV irradiation. So photocatalytic activity of TiO2 nanoflowers was higher than P25, and showing stronger photocatalytic degradation ability.

关 键 词：TIO2 纳米花 水热 模板法 自组装 

分 类 号：TQ134.1[化学工程—无机化工]