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Unique band structure enhanced visible light photocatalytic activity of phosphorus-doped BiOI hierarchical microspheres

机译：独特的能带结构增强了掺磷BiOI分级微球的可见光光催化活性

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In this article, phosphorus (P)-doped BiOI hierarchical microspheres were prepared via a facile hydrolytic method at room temperature. The morphology and structure of the samples were characterized by using X-ray powder diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, nitrogen sorption diffraction, photoluminescence spectroscopy and UV-visible diffuse spectroscopy. Based on these results, it was concluded that the P doping was beneficial to forming uniform hierarchical microspheres, which consisted of numerous two-dimensional nanosheets with a thickness in the range of 30–40 nm. It is believed that the phosphorus species had been doped into the lattice of BiOI and formed Bi–O–P bonds. Based on this fascinating characterization, the photocatalytic activity of P-doped BiOI was evidently improved, and the photocatalytic activity of the 4% P-BiOI sample for degradation of RhB is almost 2.6 times as high as pure BiOI in the case of visible light irradiation. Furthermore, the P doping could not only increase the width of the valence band but also raise the conduction band minimum, which led to the more efficient separation capacity of photogenerated carriers, the higher mobility of the resulting holes and the greater concentration of superoxide ions. In addition, the possible photocatalytic mechanism of P-doped BiOI microspheres for degrading Rhodamine B dye was proposed.
机译：在本文中，通过一种简便的室温水解方法 制备了掺磷（P）的BiOI分级微球。通过X射线粉末衍射，扫描电子显微镜，高分辨率透射电子显微镜，X射线光电子能谱，傅里叶变换红外光谱，氮吸附衍射，光致发光光谱和紫外可见漫射光谱来表征样品的形态和结构。光谱学。根据这些结果，可以得出结论，P掺杂有利于形成均匀的分级微球，该微球由许多二维纳米片组成，其厚度在30–40 nm范围内。可以认为磷已被掺入BiOI的晶格中并形成了Bi-O-P键。基于这种令人着迷的特征，P掺杂的BiOI的光催化活性得到明显改善，在可见光照射的情况下，4％P-BiOI样品对RhB的降解的光催化活性几乎是纯BiOI的2.6倍。 。此外，P掺杂不仅可以增加价带的宽度，而且可以提高导带的最小值，这导致光生载流子的分离能力更有效，所得空穴的迁移率更高以及超氧离子的浓度更高。提出了P掺杂BiOI微球降解罗丹明B染料的可能光催化机理。

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