Abstract BiPO4/BiOCl p-n heterojunction photocatalysts were successfully prepared by a facile in situ chemical transformation method with the aim of degrading rhodamine B under simulated sunlight. X-ray diffraction, field emission scanning electron microscopy, ultraviolet–visible diffuse reflectance spectroscopy, photoluminescence, and electrochemistry tests were used to characterized the structure, morphology, optical properties, and inhibited recombination of photoinduced charges. BiPO4/BiOCl composites exhibited significantly higher photocatalytic activity for the degradation of rhodamine B than pure BiOCl, and the apparent rate constant is 3.18 times higher than that of BiOCl. The significantly increased photocatalytic activity of the BiPO4/BiOCl composites can be ascribed to the formation of a p-n heterojunction, which can effectively boost the separation of photoinduced electron-hole pairs during the photocatalytic process. Additionally, the main active species were investigated and a plausible mechanism is proposed.

中文翻译：

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BiPO4/BiOCl pn异质结光催化剂在模拟阳光照射下的原位化学转化合成、电荷分离增强和光催化活性的提高

摘要 以在模拟阳光下降解罗丹明B为目的，采用简便的原位化学转化方法成功制备了BiPO4/BiOCl pn异质结光催化剂。X射线衍射、场发射扫描电子显微镜、紫外-可见漫反射光谱、光致发光和电化学测试被用来表征光生电荷的结构、形态、光学性质和抑制的复合。BiPO4/BiOCl复合材料对罗丹明B的降解光催化活性明显高于纯BiOCl，表观速率常数是BiOCl的3.18倍。BiPO4/BiOCl 复合材料显着提高的光催化活性可归因于 pn 异质结的形成，可有效促进光催化过程中光生电子-空穴对的分离。此外，研究了主要的活性物种并提出了一种合理的机制。