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首页> 外文期刊>RSC Advances >Photo-induced monomer/dimer kinetics in methylene blue degradation over doped and phase controlled nano-TiO2 films
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Photo-induced monomer/dimer kinetics in methylene blue degradation over doped and phase controlled nano-TiO2 films

机译：掺杂和相控纳米TiO2薄膜上亚甲基蓝色降解中的光诱导的单体/二聚体动力学

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摘要

Transparent TiO2 thin films containing 1 to 6 wt% of Ni, Fe and Nb doping were synthesized via a hybrid non-aqua sol-gel dip-coating technique. Metal-doping is found to affect the phase formation, polymorphic transition, visible light absorbance and optical transparency of the TiO2 films. Physico-chemical characterization revealed that, in the given doping range, addition of Ni and Fe enhances the visible light absorbance, while Nb doping does not alter the electronic structure of TiO2. Higher doping concentrations (4 and 6 wt% of Ni and Fe, respectively) lead to the crystallization of a MTiO3 (M: Ni or Fe) phase along with anatase and rutile TiO2. On the other hand, higher Nb doping favors the formation of pure anatase TiO2. 6 wt% of Ni and Fe doping induces the reduction in band gap (3.1 and 2.9 eV), whereas Nb does not alter the TiO2 band gap (3.3 eV). In contrast to the low efficiency of undoped TiO2 films, Ni-doped films yields 71% (for monomer) and 55% (for dimer) photocatalytic degradation efficiency towards methylene blue (MB) under visible light irradiation (lambda similar to 420 nm). This demonstrates the selective and preferential photo-dynamics of the MB monomer during the photocatalytic process. The doped films show a significant Incident photon to current conversion efficiency for oxidation of water under wavelength lambda >= 400 nm. Such superior improvement in the visible light activity of Ni doped TiO2 is attributed to the presence of nanosized NiTiO3 in the nanostructure of the TiO2 film.
机译：通过杂化非AQUA溶胶浸涂技术合成含有1至6wt％的Ni，Fe和Nb掺杂的透明TiO 2薄膜。发现金属掺杂影响TiO 2薄膜的相形成，多态性转变，可见光吸光度和光学透明度。物理化学表征显示，在给定的掺杂范围内，添加Ni和Fe增强了可见光吸光度，而Nb掺杂不会改变TiO2的电子结构。较高的掺杂浓度（4和6wt％的Ni和Fe）导致MTIO3（M：Ni或Fe）相的结晶以及锐钛矿和金红石TiO 2。另一方面，较高的Nb掺杂掺杂纯锐钛矿TiO2的形成。 6wt％的Ni和Fe掺杂诱导带隙的减少（3.1和2.9eV），而Nb不会改变TiO2带隙（3.3eV）。与未掺杂的TiO 2薄膜的低效率相比，Ni掺杂的薄膜在可见光照射（类似于420nm的λ）下朝亚甲基蓝（Mb）产生71％（对于单体）和55％（用于二聚体）光催化降解效率。这证明了在光催化过程中MB单体的选择性和优先光学动态。掺杂的薄膜显示出显着的事件光子，以电流转化效率用于在波长λ> = 400nm下氧化水。 Ni掺杂TiO 2的可见光活性的这种卓越的改善归因于TiO 2膜的纳米结构中的纳米硝基奥3的存在。

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  • 来源
    《RSC Advances》 |2016年第49期|共11页
  • 作者

    Murugan K.; Joardar J.; Gandhi A. S.; Murty B. S.; Borse P. H.;

  • 作者单位

    Int Adv Res Ctr Powder Met &

    New Mat Hyderabad 500005 Andhra Pradesh India;

    Int Adv Res Ctr Powder Met &

    New Mat Hyderabad 500005 Andhra Pradesh India;

    Indian Inst Technol Dept Met Engn Madras 600036 Tamil Nadu India;

    Indian Inst Technol Dept Met Engn Madras 600036 Tamil Nadu India;

    Int Adv Res Ctr Powder Met &

    New Mat Hyderabad 500005 Andhra Pradesh India;

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