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Abstract：
In environmental chemistry, photocatalysts for eliminating organic contaminants in water have gained significant interest. Our study introduces a unique heterostructure combining MIL-101(Cr) and bismuth oxyiodide (Bi5O7I). We evaluated this nanostructure\'s efficiency in adsorbing and degrading tetracycline (TC) under visible light. The Bi5O7I@MIL-101(Cr) composite, with a surface area of 637 m2/g, prevents self-aggregation seen in its components, enhancing visible light absorption. Its photocatalytic efficiency surpassed Bi5O7I and MIL-101(Cr) by 33.4 and 9.2 times, respectively. Comprehensive analyses, including scanning electron microscopy (SEM) and transmission electron microscopy (TEM), confirmed the successful formation of the heterostructure with defined morphological characteristics. BET analysis demonstrated its high surface area, while X-ray diffraction (XRD) confirmed its crystallinity. Electron spin resonance (ESR) tests showed significant generation of reactive oxygen species (ROS) like h+ and·•O2- under light, crucial for TC degradation. The material maintained exceptional durability over five cycles. Density functional theory (DFT) simulations and empirical investigations revealed a type I heterojunction between Bi5O7I and MIL-101(Cr), facilitating efficient electron-hole pair separation. This study underscores the superior photocatalytic activity and stability of Bi5O7I@MIL-101(Cr), offering insights into designing innovative photocatalysts for water purification.
摘要：
在环境化学中,用于消除水中有机污染物的光催化剂已经获得了极大的兴趣。我们的研究引入了结合MIL-101（Cr）和碘化铋（Bi5O7I）的独特异质结构。我们评估了这种纳米结构在可见光下吸附和降解四环素（TC）的效率。Bi5O7I@MIL-101(Cr)复合材料,表面积为637m2/g，防止在其组件中看到的自聚集，增强可见光的吸收。其光催化效率分别超过Bi5O7I和MIL-101（Cr）的33.4和9.2倍，分别。综合分析,包括扫描电子显微镜（SEM）和透射电子显微镜（TEM），证实了具有明确形态特征的异质结构的成功形成。BET分析表明其高表面积，而X射线衍射(XRD)证实了其结晶度。电子自旋共振（ESR）测试表明，在光下会产生大量的活性氧（ROS），例如h和··O2-。对TC降解至关重要。该材料在五个周期内保持了优异的耐久性。密度泛函理论（DFT）模拟和经验研究揭示了Bi5O7I和MIL-101（Cr）之间的I型异质结，促进有效的电子-空穴对分离。这项研究强调了Bi5O7I@MIL-101（Cr）的优异光催化活性和稳定性，提供对设计用于水净化的创新光催化剂的见解。
