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首页> 外文期刊>RSC Advances >Pd cocatalyst on Sm-doped BiFeO3 nanoparticles: synergetic effect of a Pd cocatalyst and samarium doping on photocatalysis
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Pd cocatalyst on Sm-doped BiFeO3 nanoparticles: synergetic effect of a Pd cocatalyst and samarium doping on photocatalysis

机译：SM掺杂Bifeo3纳米粒子上的PD助催化剂：Pd助催化剂和钐掺杂光催化的协同作用

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摘要

To explore the synergetic effect of rare earth doping and noble metal cocatalyst loading on the photocatalytic activity of BiFeO _(3) (BFO), in this work, novel Pd cocatalyst-loaded and Sm-doped BFO (Pd/BSFO) composite photocatalysts containing different Pd loading contents were successfully prepared by using a sol–gel method followed by an impregnation process. The experimental results revealed that the rhombohedral structure of BFO was distorted by Sm substitution, and Pd cocatalyst nanoparticles were uniformly deposited on the surface of BSFO particles with the formation of a heterojunction at the interface between Pd and BSFO. Compared to the BFO, BSFO and Pd/BFO sample, the Pd/BSFO samples exhibited improved UV-vis spectral absorption ability and significantly enhanced photocatalytic activities for the photodegradation of methyl orange or a colorless compound ( i.e. , phenol) under visible light irradiation. When the Pd loading amount on the surface of BSFO was 1.5 wt%, the optimal photocatalytic degradation efficiency was achieved. The enhanced photocatalytic activity of the Pd/BSFO photocatalyst could be attributed to the increased optical absorption, the efficient charge transfer and separation as well as the suppressed recombination of photogenerated electron–hole pairs derived from the Sm dopant trapping level and the heterojunction formation of the Schottky barrier between BSFO and the Pd cocatalyst in Pd/BSFO, as verified by photoluminescence (PL) emission spectra, photocurrent action spectra and electrochemical impedance spectra (EIS). On the basis of the calculated energy bands and trapping experiments, the photocatalytic mechanism was also discussed.
机译：探讨稀土掺杂和贵金属助催化剂加载对Bifeo _（3）（BFO）的光催化活性的协同作用，在这项工作中，新型Pd助催化和SM掺杂的BFO（PD / BSFO）复合光催化剂含有通过使用溶胶 - 凝胶法然后浸渍方法成功制备不同的Pd装载内容物。实验结果表明，BFO的菱形结构通过SM取代而扭曲，并且Pd助催化剂纳米颗粒在Pd和Bsfo之间的界面处形成异质结来均匀地沉积在Bsfo颗粒的表面上。与BFO，BSFO和PD / BFO样品相比，PD / BSFO样品具有改善的UV-Vis光谱吸收能力，并显着增强了可见光照射下甲基橙或无色化合物（即苯酚）的光催化活性。当BSFO表面上的Pd负载量为1.5wt％时，实现了最佳的光催化降解效率。 PD / BSFO光催化剂的增强的光催化活性可归因于增加的光学吸收，有效的电荷转移和分离以及衍生自SM掺杂剂捕获水平的光发生电子空穴对的抑制重组和抑制的电子空穴对PD / BSFO中Bsfo和Pd助催化剂之间的肖特基势垒，通过光致发光（PL）发射光谱，光电流动作光谱和电化学阻抗谱（EIS）验证。在计算的能带和诱捕实验的基础上，还讨论了光催化机制。

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