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CeO2 nanofibers- CdS nanostructures n–n junction with enhanced visible-light photocatalytic activity
Arabian Journal of Chemistry ( IF 6 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.arabjc.2020.08.015
Mohammad Mehdi Sabzehmeidani , Hajir Karimi , Mehrorang Ghaedi

Abstract In the present work, the n-cerium (IV) oxide (CeO2)/n- cadmium sulfide (CdS) composite nanofibers were successfully synthesized via a facile electrospinning and hydrothermal synthesis strategy. The physicochemical properties of the synthesized composite nanofibers were investigated by using X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), energy Dispersive X-Ray Spectroscopy (EDS), diffuse Reflectance Spectroscopy (DRS), fourier-transform infrared (FTIR), photoluminescence (PL), Brunauer–Emmett–Teller (BET) and Raman spectroscopy analysis. The activities of the CeO2/CdS were evaluated through the photocatalytic degradation of Rose Bengal (RB) in an aqueous solution under blue LED light radiation. CeO2/CdS composites exhibit higher photocurrent density in photocurrent response experiment and smaller charge-transfer resistance in electrochemical impedance spectroscopy (EIS). Overall, the results confirmed higher charge separation efficiency in CeO2/CdS composites compared to pristine CeO2 nanofibers, and CdS, which is related to intimately contact among the CeO2, and CdS. The present work provides a new approach to construct n-n heterojunction photocatalysts based on electrospinning and a deeper insight for the photocatalytic degradation activity. In addition, possible degradation mechanism and pathways were proposed according to the identified intermediates.

中文翻译:

CeO2 纳米纤维-具有增强的可见光光催化活性的 CdS 纳米结构 n-n 结

摘要 在目前的工作中,通过简便的静电纺丝和水热合成策略成功合成了 n-铈 (IV) 氧化物 (CeO2)/n-硫化镉 (CdS) 复合纳米纤维。通过X射线衍射(XRD)、场发射扫描电子显微镜(FESEM)、能量色散X射线光谱(EDS)、漫反射光谱(DRS)、傅立叶变换红外(FTIR)、光致发光 (PL)、Brunauer-Emmett-Teller (BET) 和拉曼光谱分析。CeO2/CdS 的活性是通过在蓝光 LED 光辐射下对水溶液中的玫瑰红 (RB) 进行光催化降解来评估的。CeO2/CdS 复合材料在光电流响应实验中表现出更高的光电流密度,在电化学阻抗谱 (EIS) 中表现出更小的电荷转移电阻。总体而言,结果证实,与原始 CeO2 纳米纤维和 CdS 相比,CeO2/CdS 复合材料具有更高的电荷分离效率,这与 CeO2 和 CdS 之间的密切接触有关。目前的工作提供了一种基于静电纺丝构建 nn 异质结光催化剂的新方法,并对光催化降解活性有了更深入的了解。此外,根据鉴定出的中间体提出了可能的降解机制和途径。结果证实,与原始 CeO2 纳米纤维和 CdS 相比,CeO2/CdS 复合材料具有更高的电荷分离效率,这与 CeO2 和 CdS 之间的密切接触有关。目前的工作提供了一种基于静电纺丝构建 nn 异质结光催化剂的新方法,并对光催化降解活性有了更深入的了解。此外,根据鉴定出的中间体提出了可能的降解机制和途径。结果证实,与原始 CeO2 纳米纤维和 CdS 相比,CeO2/CdS 复合材料具有更高的电荷分离效率,这与 CeO2 和 CdS 之间的密切接触有关。目前的工作提供了一种基于静电纺丝构建 nn 异质结光催化剂的新方法,并对光催化降解活性有了更深入的了解。此外,根据鉴定出的中间体提出了可能的降解机制和途径。
更新日期:2020-11-01
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