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ZnO/ZnAl2O4 Nanocomposite with 3D Sphere-Like Hierarchical Structure for Photocatalytic Reduction of Aqueous Cr(VI)

机译:具有3D球形分层结构的ZnO / ZnAl2O4纳米复合材料用于光催化还原Cr(VI)

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摘要

Three dimensional (3D) ZnO/ZnAl2O4 nanocomposites (ZnnAl-MMO) were synthesized by a simple urea-assisted hydrothermal process and subsequent high-temperature calcination. The as-prepared samples and their precursors were characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), UV-Vis diffuse reflectance spectroscopy (DRS), and Photoluminescence spectra (PL). It was observed that the morphology of ZnnAl-MMO nanocomposites could be tuned from cubic aggregates, hierarchically flower-like spheres to porous microspheres by simply changing the molar ratio of metal cations of the starting reaction mixtures. The photocatalytic performance of ZnO/ZnAl2O4 nanocomposites in the photoreduction of aqueous Cr(VI) indicated that the as-prepared 3D hierarchical sphere-like ZnnAl-MMO nanocomposite showed excellent photocatalytic activity of Cr(VI) reduction under UV light irradiation. The results indicated that the maximum removal percentage of aqueous Cr(VI) was 98% within four hours at 10 mg/L initial concentration of Cr(VI), owing to the effective charge separation and diversion of photogenerated carriers across the heterojunction interface of the composite. Our study put forward a facile method to fabricate hierarchical ZnO/ZnAl2O4 composites with potential applications for wastewater treatment.
机译:通过简单的尿素辅助水热法并随后进行高温煅烧,合成了三维(3D)ZnO / ZnAl2O4纳米复合材料(ZnnAl-MMO)。所制备的样品及其前体通过X射线衍射(XRD),扫描电子显微镜(SEM),透射电子显微镜(TEM),紫外-可见漫反射光谱(DRS)和光致发光光谱(PL)进行表征。观察到,可以通过简单地改变起始反应混合物中金属阳离子的摩尔比,将ZnnAl-MMO纳米复合材料的形态从立方团聚体,从花状球到多孔微球进行调节。 ZnO / ZnAl2O4纳米复合材料在Cr(VI)水溶液光还原中的光催化性能表明,所制备的3D分层球形ZnnAl-MMO纳米复合材料在紫外光照射下具有优异的还原Cr(VI)的光催化活性。结果表明,在初始浓度为10 mg / L的Cr(VI)下,四小时内Cr(VI)的最大去除率为98%,这是由于有效的电荷分离和光生载流子跨过异质结界面转移的结果。综合。我们的研究提出了一种简便的方法来制备分层的ZnO / ZnAl2O4复合材料,在废水处理中具有潜在的应用前景。

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