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首页> 外文期刊>RSC Advances >Enhanced visible light photocatalytic activity of BiOI/BiOCOOH composites synthesized via ion exchange strategy
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Enhanced visible light photocatalytic activity of BiOI/BiOCOOH composites synthesized via ion exchange strategy

机译：通过离子交换策略合成的BiOI / BiOCOOH复合材料的可见光催化活性增强

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摘要

The BiOI/BiOCOOH composites were synthesized by a facile ion exchange strategy between BiOCOOH precursor and KI by ultrasonic reaction. The as-prepared BiOI/BiOCOOH composites were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance absorption spectra (DRS), Fourier transform infrared spectroscopy (FTIR) and photoluminescence spectra (PL). Under visible light illumination, the BiOI/BiOCOOH composites exhibited much higher photocatalytic activities than those of single BiOCOOH and BiOI for the degradation of Rhodamine B (RhB). The markedly enhanced photocatalytic activities of BiOI/BiOCOOH composites were attributed to the formation of a p-n heterojunction between p-type BiOI and n-type BiOCOOH, which facilitated the charge separation of photogenerated electron-hole pairs. The photoelectrochemical measurement confirmed that the charge separation efficiency was greatly improved by the formation of the heterojunction structure. Moreover, tests of radical scavengers demonstrated that h(+) and O-center dot(2)- were the main active species for the degradation of RhB.
机译：BiOIOH / BiOCOOH复合材料是通过BiOCOOH前体与KI之间的简便离子交换策略通过超声反应合成的。制备的BiOI / BiOCOOH复合材料通过X射线衍射（XRD），场发射扫描电子显微镜（FESEM），能量色散X射线光谱（EDS），X射线光电子光谱（XPS），UV-vis表征漫反射吸收光谱（DRS），傅立叶变换红外光谱（FTIR）和光致发光光谱（PL）。在可见光照射下，BiOI / BiOCOOH复合材料对罗丹明B（RhB）的降解表现出比单个BiOCOOH和BiOI更高的光催化活性。 BiOI / BiOCOOH复合材料的光催化活性显着增强归因于p型BiOI和n型BiOCOOH之间的p-n异质结的形成，这有助于光生电子-空穴对的电荷分离。光电化学测量证实，通过形成异质结结构，电荷分离效率大大提高。此外，自由基清除剂的测试表明，h（+）和O-center dot（2）-是RhB降解的主要活性物质。

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