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Visible-light driven FexOy/TiO2/Au photocatalyst – synthesis, characterization and application for methyl orange photodegradation
Journal of Electroanalytical Chemistry ( IF 4.5 ) Pub Date : 2020-02-01 , DOI: 10.1016/j.jelechem.2020.113829
Dariusz Boczar , Tomasz Łęcki , Magdalena Skompska

Abstract A visible-light driven ternary photocatalyst of magnetic properties was prepared by a simple three-step synthesis. The Fe3O4 nanoparticles obtained by solvothermal method were covered with a layer of TiO2 by sol-gel procedure and amount of TiO2 in the shell around the magnetic core was increased by repetition of sol-gel runs. After calcination the composite was decorated with Au nanoparticles by photodeposition using a [AuClx(OH)4−x]− complex as a gold precursor. The obtained binary (FexOy/TiO2) and ternary (FexOy/TiO2/Au) systems were characterized with the use of X-ray diffraction (XRD), UV–vis diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HR-TEM) and energy dispersive X-ray (EDX) spectroscopic mapping. The photocatalytic activity of the systems with and without Au nanoparticles was studied in the reaction of methyl orange (MO) photodegradation under irradiation with visible light lamp and monochromatic diode (523 nm) to determine the role of TiO2 and Au nanoparticles in the photocatalytic process. The main species involved in the photocatalytic degradation of MO were determined with the use of reactive radical scavengers. The alternative core/shell composite FexOy/SiO2/TiO2/Au was prepared to determine the role of FexOy/TiO2 interface in the photocatalytic process.

中文翻译:

可见光驱动的 FexOy/TiO2/Au 光催化剂——甲基橙光降解的合成、表征和应用

摘要 通过简单的三步合成法制备了一种可见光驱动的具有磁性的三元光催化剂。通过溶胶-凝胶程序,通过溶剂热法获得的 Fe3O4 纳米颗粒覆盖有一层 TiO2,并且通过重复溶胶-凝胶运行,磁芯周围壳中的 TiO2 量增加。煅烧后,使用 [AuClx(OH)4-x]- 复合物作为金前体,通过光沉积用 Au 纳米颗粒装饰复合材料。获得的二元 (FexOy/TiO2) 和三元 (FexOy/TiO2/Au) 系统使用 X 射线衍射 (XRD)、紫外可见漫反射光谱 (DRS)、扫描电子显微镜 (SEM)、高分辨率透射电子显微镜 (HR-TEM) 和能量色散 X 射线 (EDX) 光谱映射。研究了在可见光灯和单色二极管(523 nm)照射下甲基橙(MO)光降解反应中含有和不含 Au 纳米颗粒的体系的光催化活性,以确定 TiO2 和 Au 纳米颗粒在光催化过程中的作用。使用活性自由基清除剂确定了参与光催化降解 MO 的主要物种。制备替代核/壳复合材料 FexOy/SiO2/TiO2/Au 以确定 FexOy/TiO2 界面在光催化过程中的作用。使用活性自由基清除剂确定了参与光催化降解 MO 的主要物种。制备替代核/壳复合材料 FexOy/SiO2/TiO2/Au 以确定 FexOy/TiO2 界面在光催化过程中的作用。使用活性自由基清除剂确定了参与光催化降解 MO 的主要物种。制备替代核/壳复合材料 FexOy/SiO2/TiO2/Au 以确定 FexOy/TiO2 界面在光催化过程中的作用。
更新日期:2020-02-01
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