College of Materials Science and Engineering, Nanjing Forestry University, No. 159, Longpan Road, Nanjing, 210037 Jiangsu, People's Republic of China; Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, 51666-16471 Tabriz, Iran.
Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, 51666-16471 Tabriz, Iran; Centre of Advanced Manufacturing and Materials Processing, Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia.
J Hazard Mater. 2019 Aug 15;376:200-211. doi: 10.1016/j.jhazmat.2019.05.035. Epub 2019 May 17.
The main prerequisite of an active visible-light-driven photocatalyst is to effectively utilize the visible light to induce electron-hole (e/h) pairs of expanded lifetime. To this end, for the first time, the ternary heterojunctions of CeO/FeO /Graphene oxide and Ce/ FeO /Graphene oxide (CeO/FeO/GO and FeCeO/GO) were prepared via facile ultrasonic-assisted procedures and employed for destruction of oxytetracycline (OTC) under visible light irradiation. The changes in the relative crystal structure, morphology, atomic and surface functional group composition, magnetic, and optic properties of magnetite were uncovered by various techniques. The substantial degradation and mineralization of OTC via visible light/FeCeO/GO system were thoroughly discussed in terms of narrowed band gap energy, the principal function of Ce/Ce and Fe/Fe redox pairs and GO platelets, enhanced charge separation and transfer, and enlarged active surface area. Furthermore, the performance of visible light/FeCeO/GO system was evaluated for treating real wastewater and its efficiency was investigated using a number of enhancers and scavengers. Finally, the generated byproducts in the course of photodegradation were determined and the oxidation pathway, photocatalytic kinetics, and plausible mechanism were proposed. The results confirmed that the introduced Ce ions and graphene oxide sheets boost the photo-catalytic efficiency of magnetite for photodegradation of OTC.
作为一种有效的可见光驱动光催化剂，其主要前提条件是有效利用可见光来诱导扩展寿命的电子-空穴（e/h）对。为此，我们首次通过简便的超声辅助程序制备了 CeO/FeO/氧化石墨烯和 Ce/FeO/氧化石墨烯（CeO/FeO/GO 和 FeCeO/GO）的三元异质结，并将其用于可见光照射下破坏土霉素（OTC）。通过各种技术揭示了磁铁矿的相对晶体结构、形态、原子和表面官能团组成、磁性和光学性质的变化。通过缩小带隙能量、Ce/Ce 和 Fe/Fe 氧化还原对和 GO 片的主要功能、增强的电荷分离和转移以及扩大的活性表面积，彻底讨论了可见光/FeCeO/GO 体系中 OTC 的大量降解和矿化。此外，还评估了可见光/FeCeO/GO 体系处理实际废水的性能，并使用多种增强剂和清除剂研究了其效率。最后，确定了光降解过程中生成的副产物，并提出了氧化途径、光催化动力学和可能的机制。结果证实，引入的 Ce 离子和氧化石墨烯片提高了磁铁矿的光催化效率，从而促进了 OTC 的光降解。
