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首页> 外文期刊>RSC Advances >Preparation of novel BiOBr/CeO2 heterostructured photocatalysts and their enhanced photocatalytic activity
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Preparation of novel BiOBr/CeO2 heterostructured photocatalysts and their enhanced photocatalytic activity

机译：新型BiOBr / CeO2异质结构光催化剂的制备及其增强的光催化活性

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摘要

Novel BiOBr/CeO2 heterostructured photocatalysts were synthesized by a simple solvothermal method. The photocatalysts compared with pure BiOBr and pure CeO2 are more photoactive in photocatalytic oxidation of rhodamine B (RhB), methylene blue (MB) and bisphenol A (BPA) under visible light irradiation. The photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible (UV-vis) absorption spectroscopy and photoluminescence (PL) spectroscopy. The 5 : 1 BiOBr/CeO2 shows the highest visible-light photocatalytic activity for degradation of RhB and is highly stable during photodegradation. The remarkably enhanced photocatalytic activities could be mainly attributed to the low recombination ability between photo-induced electrons and holes, which results from the formation of a heterojunction structure between BiOBr and CeO2. The active species trapping experiments indicate that the primary oxidative species in the reaction system are the photogenerated hole (h(+)) and superoxide radicals (center dot O-2(-)). A possible mechanism for the photocatalytic activity enhancement was also put forward on the basis of the experimental results.
机译：通过简单的溶剂热法合成了新型的BiOBr / CeO2异质结构光催化剂。与纯BiOBr和纯CeO2相比，在可见光照射下，若丹明B（RhB），亚甲基蓝（MB）和双酚A（BPA）的光催化氧化具有更高的光活性。通过X射线衍射（XRD），扫描电子显微镜（SEM），高分辨率透射电子显微镜（HRTEM），能量色散X射线光谱（EDS），X射线光电子光谱（XPS），紫外光对光催化剂进行了表征可见（UV-vis）吸收光谱和光致发光（PL）光谱。 5：1 BiOBr / CeO2对RhB的降解显示出最高的可见光光催化活性，并且在光降解过程中非常稳定。显着增强的光催化活性可能主要归因于BiOBr和CeO2之间形成异质结结构，导致光诱导电子与空穴之间的复合能力低。活性物种捕获实验表明，反应系统中的主要氧化物种是光生空穴（h（+））和超氧自由基（中心点O-2（-））。在实验结果的基础上，提出了提高光催化活性的可能机理。

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