A series of binary composite photo-catalyst BiOBr/MgBTC (the ligand of MgBTC is 1, 3, 5-benzenetricarboxylate = H₃BTC) with different content of BiOBr have been designed and used to degrade the traditional dye rhodamine B (RhB). As-prepared binary composites have been first obtained via a simple hydrothermal system and subsequently deposited onto the BiOBr substrates. The composites exhibited better catalytic performance compared with the pristine BiOBr, and the performance of BM-55 (synthesized by 0.55 mmol BiOBr and 0.45 mmol MgCl₂•6H₂O) was the most efficient and its removal rate of RhB can reach 98.3% within 60 min. The composite photo catalyst was characterized by X-ray diffraction (XRD), infrared (IR), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), diffuse reflectance spectroscopy (DRS), photoluminescence (PL), and electrochemical impedance spectroscopy (EIS), respectively. In the free radical trapping experiments, it can be seen that the main photo-catalytic active species are superoxide radicals (•O₂−) and holes (h⁺). This work can provide considerable opportunities to the development of various metal–organic frameworks (MOF)-based visible light photo-catalysts and modified 2D bismuth ox halide materials (BiOX) for use in environmental cleaning application.

中文翻译：

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BiOBr/Mg金属有机骨架催化剂的合成在可见光下降解有机染料罗丹明B的应用

设计了一系列不同BiOBr含量的二元复合光催化剂BiOBr/MgBTC（MgBTC的配位体为1, 3, 5-苯三羧酸酯= H ₃ BTC），用于降解传统染料罗丹明B（RhB）。所制备的二元复合材料首先通过简单的水热系统获得，然后沉积在 BiOBr 基材上。与原始的 BiOBr 相比，复合材料表现出更好的催化性能，BM-55（由 0.55 mmol BiOBr 和 0.45 mmol MgCl ₂ •6H ₂O)的效率最高，60分钟内对RhB的去除率可达98.3%。该复合光催化剂通过 X 射线衍射 (XRD)、红外 (IR)、扫描电子显微镜 (SEM)、X 射线光电子能谱 (XPS)、漫反射光谱 (DRS)、光致发光 (PL) 和电化学表征。阻抗谱（EIS），分别。在自由基捕获实验中，可以看出主要的光催化活性物种是超氧自由基（•O ₂ -）和空穴（h ⁺）。这项工作可以为开发各种基于金属-有机骨架（MOF）的可见光光催化剂和用于环境清洁应用的改性二维卤化铋材料（BiOX）提供大量机会。