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首页> 外文期刊>RSC Advances >Magnetically separable ZnFe2O4, Fe2O3/ZnFe2O4 and ZnO/ZnFe2O4 hollow nanospheres with enhanced visible photocatalytic properties
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Magnetically separable ZnFe2O4, Fe2O3/ZnFe2O4 and ZnO/ZnFe2O4 hollow nanospheres with enhanced visible photocatalytic properties

机译：具有增强的可见光催化性能的可磁分离的ZnFe2O4，Fe2O3 / ZnFe2O4和ZnO / ZnFe2O4空心纳米球

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摘要

Magnetically separable ZnFe2O4-based composite hollow nanospheres with dimensions of 230 nm were successfully synthesized via an impregnating-calcination process using phenolic formaldehyde nanospheres (PFS) as a template. ZnFe2O4, Fe2O3/ZnFe2O4 and ZnO/ZnFe2O4 hollow nanospheres were synthesized by tuning the concentration of zinc salts. The samples were characterized by X-ray powder diffraction, energy dispersion spectroscopy, scanning electronic microscopy, transmission electron microscopy, nitrogen sorption measurements, UV-vis diffuse reflectance spectra and photoluminescence emission spectra. The results of photodegradation under visible light irradiation exhibited the order: ZnO/ZnFe2O4 > Fe2O3/ZnFe2O4 > ZnFe2O4 > bulk ZnFe2O4, and close investigation revealed that the high surface area, thin shell thicknesses, and matching heterostructures of the as-prepared ZnO/ZnFe2O4 and Fe2O3/ZnFe2O4 composites could dramatically improve the photocatalytic activity, which facilitates the efficient separation of photoinduced electron-hole pairs. Furthermore, the ZnFe2O4-based hollow nanospheres could be conveniently separated using an external magnetic field, and were chemically and optically stable after several repetitive tests. The study also provides a general and effective method towards the synthesis of composition-tunable hollow nanomaterials with sound heterojunctions that show a variety of potential applications.
机译：以酚醛纳米球（PFS）为模板，通过浸渍煅烧工艺成功合成了尺寸为230nm的可磁分离的ZnFe2O4基复合空心纳米球。通过调节锌盐的浓度，合成了ZnFe2O4，Fe2O3 / ZnFe2O4和ZnO / ZnFe2O4中空纳米球。通过X射线粉末衍射，能量分散光谱，扫描电子显微镜，透射电子显微镜，氮吸附测量，UV-可见漫反射光谱和光致发光发射光谱来表征样品。可见光照射下的光降解结果表现为：ZnO / ZnFe2O4> Fe2O3 / ZnFe2O4> ZnFe2O4>块状ZnFe2O4，仔细研究表明，所制备的ZnO / ZnFe2O4具有较高的表面积，薄壳厚度和匹配的异质结构。 Fe2O3 / ZnFe2O4复合材料可以显着提高光催化活性，促进光致电子-空穴对的有效分离。此外，基于ZnFe2O4的中空纳米球可以使用外部磁场方便地分离，并且经过多次重复测试后在化学和光学上均稳定。这项研究还为合成具有声音异质结的组成可调的空心纳米材料提供了一种通用而有效的方法，该方法显示了多种潜在应用。

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