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具有不同001晶面暴露分数的纳米TiO2制备及其光催化性能研究

Preparation and Photocatalytic Activity Study of Nano-TiO2 with Different Exposed Percentage of 001 Facets

    摘要
  • 摘要: 以钛酸四丁酯（TBOT）为钛源、氢氟酸（HF）为形貌控制剂，采用水热法分别制备了具有40%、73%和85%001晶面暴露分数的纳米锐钛矿相TiO2单晶.所制备TiO2样品采用X-射线粉末衍射（XRD）、紫外-可见漫反射吸收（UV-Vis DRS）和扫描电子显微镜（SEM）等测试方法进行结构和形貌表征，在此基础上评价紫外光照射下的降解甲基橙（MO）性能.结果表明：所制备TiO2样品2 h之内对MO的降解率分别为：100%（TiO2-9）>93%（TiO2-3）>80%（TiO2-6），TiO2的光催化性能是晶面效应、尺寸效应以及载流子的分离及迁移效率等协同作用的结果.

     

    Abstract: Anatase nano-TiO2 with 40%,73% and 85% percentage of001facets were prepared by hydrothermal reaction using tetrabutyl titanate (TBOT) as titanium source and hydrofluoric acid (HF) as the capping agent.Moreover,the structure and morphology of as the prepared TiO2 samples were investigated by X-ray diffraction (XRD),UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS) and scanning electron microscopy (SEM).The photocatalytic activity was evaluated by degradation of methyl orange (MO) aqueous solution under ultraviolet (UV) light irradiation.The experimental results showed that the MO degradation efficiency order of prepared TiO2 nanocrystals during 2 hours is 100%(TiO2-9)>93%(TiO2-3)>80%(TiO2-6),which is ascribed to the synergistic effects of facet effect,size effect and separation and transport efficiency of photoinduced charge carriers.

     

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