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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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Transparent TiO _(2) 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 TiO _(2) 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 TiO _(2) . Higher doping concentrations (4 and 6 wt% of Ni and Fe, respectively) lead to the crystallization of a MTiO _(3) (M: Ni or Fe) phase along with anatase and rutile TiO _(2) . On the other hand, higher Nb doping favors the formation of pure anatase TiO _(2) . 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 TiO _(2) band gap (3.3 eV). In contrast to the low efficiency of undoped TiO _(2) films, Ni-doped films yields 71% (for monomer) and 55% (for dimer) photocatalytic degradation efficiency towards methylene blue (MB) under visible light irradiation ( λ ～ 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 λ ≥ 400 nm. Such superior improvement in the visible light activity of Ni doped TiO _(2) is attributed to the presence of nanosized NiTiO _(3) in the nanostructure of the TiO _(2) film.
机译：透明TiO _（2）含有1至6wt％的Ni，Fe和Nb掺杂的薄膜通过杂合非Aqua溶胶浸涂技术合成。发现金属掺杂来影响TiO _（2）膜的相形成，多态性转变，可见光吸收和光学透明度。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TiO _（2）的电子结构。较高的掺杂浓度（4和6wt％的Ni和Fe）导致MTIO _（3）（MM：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掺杂有利于纯锐钛矿TiO _（2）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TiO _（2）带隙（3.3eV）。与未掺杂的TiO _（2）膜的低效率相比，Ni掺杂的薄膜在可见光照射下产生71％（对于单体）和55％（用于二聚体）光催化降解效率（λ〜420 nm）。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下的水氧化。 Ni掺杂TiO _（2）的可见光活性的这种优异的改善归因于TiO _（2）膜的纳米结构中的纳米硝基奥_（3）的存在。

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