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Effect of triblock copolymers on crystal growth and the photocatalytic activity of anatase TiO(2)single crystals

机译：三嵌段共聚物对锐钛酶TiO（2）单晶晶体生长和光催化活性的影响

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摘要

In order to evaluate the effect of a triblock copolymer on the growth of TiO(2)crystals, anatase TiO(2)crystals with different morphologies and structures were synthesized by controlling the content and type of triblock copolymer in the solvothermal route. The resulting samples were characterized by XRD, XPS, SEM, TEM and EDX. The characterization results show that hydrofluoric acid can promote the formation of highly active (001) facets by the formation of a Ti-F bond. The triblock copolymers (P123 and F127) refine the surface structure of polycrystalline spherical TiO(2)and make the crystal surface homogeneous and smooth. Moreover, P123 causes the agglomeration effect and hinders the recrystallization process of anatase TiO(2)single crystals, and this will lead to corrosion of the crystal facets. Meanwhile, F127 destroys crystal formation and hinders crystal growth due to its special micelle structure. In addition, research on the photocatalytic activity proposed that the integrity of the (001) and (101) facets was a critical factor in the photocatalytic reaction. The resultant anatase TiO(2)single crystals could produce more hydroxyl radicals (OH) in the photocatalytic system, which exhibited remarkable photocatalytic performance for the degradation of three types of dye.
机译：为了评估三嵌段共聚物对TiO（2）晶体生长的影响，通过控制溶剂热途径中的三嵌段共聚物的含量和类型的三嵌段共聚物来合成具有不同形态和结构的锐钛矿TiO（2）晶体。通过XRD，XPS，SEM，TEM和EDX表征得到的样品。表征结果表明，氢氟酸可以通过形成Ti-F键来促进高活性（001）刻面的形成。三嵌段共聚物（P123和F127）优化多晶球形TiO（2）的表面结构，使晶体表面均匀和光滑。此外，P123导致附聚效应并阻碍锐钛矿TiO（2）单晶的再结晶过程，这将导致晶面的腐蚀。同时，由于其特殊的胶束结构，F127破坏了晶体形成和阻碍晶体生长。此外，对光催化活性的研究提出，（001）和（101）小平面的完整性是光催化反应中的关键因素。所得锐钛矿TiO（2）单晶可以在光催化系统中产生更多的羟基自由基（OH），这表现出显着的光催化性能，用于降解三种类型的染料。

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  • 来源
    《RSC Advances》 |2020年第54期|共9页
  • 作者

    Dong Yeshuo; Meng Fanjun;

  • 作者单位

    Qingdao Univ Technol Sch Environm &

    Municipal Engn Qingdao 266033 Peoples R China;

    Shandong Normal Univ Coll Chem Chem Engn &

    Mat Sci Jinan 250014 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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