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High performance nanohybrid CeO2@2D CdO plates with suppressed charge recombination: Insights of photoluminescence, visible-light photocatalysis, intrinsic mechanism and antibacterial activity
Optical Materials ( IF 3.9 ) Pub Date : 2021-09-08 , DOI: 10.1016/j.optmat.2021.111510
Asad Syed 1 , Abdallah M. Elgorban 1 , Abdulaziz A. Al Kheraif 2
Affiliation  

The construction of CdO-based nano-heterojunction photocatalyst gathers more attention since pure CdO suffers rapid e/h+ pair recombination rate. In this study, CdO/CeO2 was fabricated by sono-chemical synthesis. HRTEM depicts the decoration of CeO2 on nanoplates like CdO. The crystalline structure of CdO/CeO2 nanocomposites (NCs) with coexistence of CdO and CeO2 was revealed by X-ray powder diffraction (XRD) analysis. The chemical states of NCs were determined by X-ray photoelectron spectroscopy (XPS). The narrow bandgap of 2.67 eV enhance the visible light photon absorption ability. In accordance with Brunauer-Emmett-Teller (BET) surface area analysis, it is evident that compared to individual particles the prepared NCs have a high surface area of 260.73 m2/g. The type II interface in CdO/CeO2 NCs facilitates e/h+ pair migration and charge carrier separation. The reduced e/h+ pair recombination was ensured by photoluminescence analysis. Under visible light, the NCs showed excellent photocatalytic activity compared to individual particles. The particles showed 87.6% degradation of methylene blue (MB) in 180 min. The scavengers study revealed the major role of ·OH and h+ in MB photodegradation. The CdO/CeO2 NCs possessed high stability even after six cycles and XRD of recycled particles confirmed the resistance of NCs towards photo-corrosion. In addition, NCs showed excellent anti-bacterial activity. Finally, it could be suggested that CdO/CeO2 NCs can find potential applications in industrial water treatment processes and in self cleaning materials due to its high stability and active nature.



中文翻译:

具有抑制电荷复合的高性能纳米杂化 CeO2@2D CdO 板:光致发光、可见光光催化、内在机制和抗菌活性的见解

由于纯 CdO 具有快速的 e - /h +对复合率,因此基于 CdO 的纳米异质结光催化剂的构建受到更多关注。在本研究中,CdO/CeO 2是通过声化学合成法制备的。HRTEM 描绘了像 CdO 这样的纳米片上的 CeO 2装饰。氧化镉/铈的晶体结构2层的纳米复合材料(NCS)与氧化镉和铈的共存2通过 X 射线粉末衍射 (XRD) 分析揭示。通过 X 射线光电子能谱 (XPS) 确定 NCs 的化学状态。2.67 eV 的窄带隙增强了可见光光子吸收能力。根据Brunauer-Emmett-Teller (BET) 表面积分析,很明显,与单个颗粒相比,制备的NCs 具有260.73 m 2 /g的高表面积。CdO/CeO 2 NCs 中的II 型界面促进了 e - /h +对迁移和电荷载流子分离。减少的 e - /h +通过光致发光分析确保配对重组。在可见光下,与单个颗粒相比,NCs 表现出优异的光催化活性。颗粒在 180 分钟内显示出 87.6% 的亚甲蓝 (MB) 降解。清除剂研究揭示了·OH 和h +在MB 光降解中的主要作用。即使经过六次循环,CdO/CeO 2 NCs 仍具有高稳定性,并且回收颗粒的 XRD 证实了 NCs 对光腐蚀的抵抗力。此外,NCs显示出优异的抗菌活性。最后,CdO/CeO 2 NCs 由于其高稳定性和活性,可以在工业水处理过程和自清洁材料中找到潜在的应用。

更新日期:2021-09-08
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