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Synthesis of Er-doped Bi2WO6 and enhancement in photocatalytic activity induced by visible light

机译：掺Er的Bi2WO6的合成及可见光诱导的光催化活性增强

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摘要

Bi2WO6: Er3+ with hierarchical flower-like microstructures were synthesized by a one-step hydrothermal method. The photocatalysts thus obtained were characterized in detail by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-vis diffuse reflectance spectroscopy (UV-vis DRS), X-ray photoelectron spectroscopy (XPS) as well as photoluminescence (PL) measurements. Results obtained by XPS confirmed the presence of Er3+ dopants in Bi2WO6. Moreover, the results obtained from SEM have shown that doping with Er ions results in hierarchical flower-like microstructures of Bi2WO6. Under visible light irradiation, with an appropriate doping content, the photocatalysts exhibit significant improvement in the photocatalytic activity as the separation efficiency of the photogenerated electron-hole pairs is enhanced. Notably, the photocatalytic activity of 1.5% Bi2WO6: Er3+ is 3.69 times that of undoped Bi2WO6. The results indicate that an appropriate doping content can improve photocatalytic activity, caused by wider band gap, hierarchical flower-like microstructures, and defects generated by doping with Er3+, which in turn increase the separation efficiency of the photogenerated electron-hole pairs.
机译：通过一步水热法合成了具有分层花状微结构的Bi2WO6：Er3 +。由此获得的光催化剂通过X射线衍射（XRD），扫描电子显微镜（SEM），UV可见漫反射光谱（UV-vis DRS），X射线光电子光谱（XPS）以及光致发光（ PL）测量。 XPS获得的结果证实Bi2WO6中存在Er3 +掺杂剂。此外，从SEM获得的结果表明，掺入Er离子导致Bi 2 WO 6的分层花状微结构。在可见光照射下，以适当的掺杂量，随着光生电子-空穴对的分离效率提高，光催化剂显示出显着的光催化活性改善。值得注意的是，1.5％Bi2WO6：Er3 +的光催化活性是未掺杂Bi2WO6的3.69倍。结果表明，适当的掺杂含量可以提高光催化活性，这是由较宽的带隙，分层的花状微观结构以及掺杂Er3 +所产生的缺陷所致，从而提高了光生电子-空穴对的分离效率。

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