CAJ | 학술논문

以钛酸盐纳米管为前驱体,在HF-H2O-C2H5OH的混合溶液中,采用一种简单的醇热方法合成了具有87%暴露{001}面的TiO2纳米片自组装形成的分等级花状TiO2超结构.运用X射线衍射、扫描电镜、透射电镜和N2吸附-脱附等方法对样品进行了表征,并在紫外光照射下于空气和溶液中分别考察了其光催化降解丙酮和甲基橙反应活性.结果表明,这种分等级花状结构TiO2的光催化活性比商业P25和在纯水中制备得到的片状锐钛矿TiO2的光活性高得多.这主要是由于该样品具有分等级的多孔结构,暴露的{001}晶面和增强的光吸收能力.这种分等级花状TiO2超结构在太阳能电池、光催化产氢、光电子器件、传感器和催化方面也具有巨大的应用前景.
이태산염납미관위전구체,재HF-H2O-C2H5OH적혼합용액중,채용일충간단적순열방법합성료구유87%폭로{001}면적TiO2납미편자조장형성적분등급화상TiO2초결구.운용X사선연사、소묘전경、투사전경화N2흡부-탈부등방법대양품진행료표정,병재자외광조사하우공기화용액중분별고찰료기광최화강해병동화갑기등반응활성.결과표명,저충분등급화상결구TiO2적광최화활성비상업P25화재순수중제비득도적편상예태광TiO2적광활성고득다.저주요시유우해양품구유분등급적다공결구,폭로적{001}정면화증강적광흡수능력.저충분등급화상TiO2초결구재태양능전지、광최화산경、광전자기건、전감기화최화방면야구유거대적응용전경.
The fabrication of well defined hierarchical structures of anatase TiO2 with a high percentage of reactive facets is of great importance and challenging. Hierarchically flower-like TiO2 superstructures (HFTS) self-assembled from anatase TiO2 nanosheets with exposed {001} facets (up to 87%) were synthesized by a simple alcohothermal strategy in a HF-H2O-C2H5OH mixed solution using titanate nanotubes as precursor. The samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy,and N2 adsorption-desorption isotherms. The photocatalytic activity was evaluated by the photocatalytic oxidation decomposition of acetone in air and methyl orange in aqueous solution under UV illumination. The photocatalytic activity of HFTS was much higher than that of commercial Degussa P25 and tabular-shaped anatase TiO2 obtained using pure water as the synthesis medium. The enhancement in photocatalytic activity was related to several factors, including the hierarchically porous structure, exposed {001 } facets, and increased light harvesting ability. The HFTS was also of interest for use in solar cells, photocatalytic H2 production, optoelectronic devices, sensors, and catalysis.