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The effect of iron doping on the photocatalytic activity of a Bi2WO6–BiVO4 composite

机译：铁掺杂对Bi2wo6-Bivo4复合材料光催化活性的影响

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Visible-light-driven Fe-doped Bi _(2) WO _(6) –BiVO _(4) composites have been synthesized via a hydrothermal method with varying nominal iron contents in the range of 0.5–5.0 mol%. The physicochemical properties of the obtained materials were characterized by X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET)-specific surface area, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), inductively coupled plasma-optical emission spectroscopy (ICP-OES), UV-vis diffuse reflectance spectroscopy (UV-vis DRS), and photoluminescence (PL) techniques. Methylene blue (MB) as probe pollutant was adopted to investigate the photocatalytic activity of all samples under visible light irradiation. The Fe-doped Bi _(2) WO _(6) –BiVO _(4) composites showed an enhanced photocatalytic activity for the degradation of MB under visible light, which was attributed to the iron ions acting as good electron and hole traps for facilitating the separation of charge carriers. Simultaneously, the high stability of the sample was also investigated by five successive photodegradation tests of MB under visible light. The relationship between the photocatalytic activities and the structures of Fe-doped Bi _(2) WO _(6) –BiVO _(4) composites was discussed. The possible photocatalytic mechanism of the composites was proposed to guide the further improvement of their photocatalytic performance.
机译：可见光驱动的Fe掺杂的Bi _（2）WO _（6）-Bivo _（4）复合材料已经通过水热法合成，其标称铁含量不同，范围为0.5-5.0mol％。所得材料的物理化学性质的特征在于X射线衍射（XRD），Brunauer-Emmett-exerser（Bet）的表面积，透射电子显微镜（TEM），X射线光电子能谱（XPS），电感耦合等离子体 - 光学发射光谱（ICP-OES），UV-VI扩散反射光谱（UV-VIS DRS）和光致发光（PL）技术。作为探针污染物的亚甲基蓝（MB）研究了在可见光照射下所有样品的光催化活性。 Fe掺杂的Bi _（2）WO _（6）-BiVO _（4）复合材料显示出可见光下的MB降解的增强的光催化活性，其归因于代表良好电子和漏斗捕集的铁离子促进电荷载体的分离。同时，还在可见光下的MB的五个连续的光降解试验中研究了样品的高稳定性。讨论了光催化活性与Fe掺杂Bi _（2）WO _（6）-BiVO _（4）复合材料的结构之间的关系。提出了复合材料的可能光催化机理，以引导其光催化性能的进一步提高。

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