NiFe-LDH@ZnO@NF composite for photo-degradation of Rhodamine B dye
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MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.234
NiFe-LDH@ZnO@NF composite for photodegradation of Rhodamine B dye Jun Wu, Yonghui Gong, Qiang Fu, Chunxu Pan* School of Physics and Technology, and MOE Key Laboratory of Artificial Micro- and Nano-structures, Wuhan University, Wuhan, 430072, China
ABSTRACT
In this paper, a novel NiFe-LDH@ZnO composite was prepared by using a facile two-step process upon nickel foam (NF) substrate. The morphologies and chemical compositions of the samples were characterized by SEM, EDS, XRD and XPS. Photocatalytic degradation of Rhodamine B dye was tested with the samples NiFe-LDH@ZnO@NF, ZnO@NF and NiFeLDH under the same conditions. The experimental results revealed that the NiFeLDH@ZnO@NF composite exhibited excellent photocatalytic performance, i.e., 1.4 and 2.5 times higher than that of pure ZnO and NiFe-LDH, respectively. The reason was that the NiFe-LDH@ZnO@NF composite provided a possibility to effectively inhibit the recombination of the photogenerated electron-hole pairs, and therefore enhanced the photocatalytic efficiency. This composite is expected to have potential applications in wastewater treatment field.
INTRODUCTION In recent years, photocatalytic technology has attracted a great attention, due to its advantages, such as thorough pollutant purification, strong oxidation and reduction, nontoxicity, and long-term stability, etc [1]. Among various photocatalysis, ZnO has been recognized as one of excellent photocatalysts, because of its high photosensitivity, nontoxic nature, and large band gap [2-3]. However, improving its photocatalytic efficiency to meet practical application requirements is still a challenge, due to the bottleneck of poor quantum yield [4]. In order to improve its photocatalytic performance, many methods have been proposed, such as metal and non-metal ion-doping, noble metal deposition, oxide semiconductor coupling and so on [5-9]. In general, oxide semiconductor coupling is one of an effective process, which not only increases the light utilization efficiency, but also enhances electron-hole pair
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separation efficiency. In our previous work, different ZnO-based composites were prepared including the ZnO/TiO2 heterojunction composite fibers [10], porous micronano-structive NiO/ZnO heterostructural composite [11], 3D reticulated ZnO/CNF/NiO heteroarchitecture [9], Au/ZnO/NiO composite [8] and hierarchical TiO2 nanorod array/graphene/ZnO nanocomposites [12]. These composites have been proved the higher separation efficiency of the photogenerated electron-hole pairs and photocatalytic performance. Layered double hydroxides (LDHs) have been known as hydrotalcitelike compounds and have received much interest in the field of catalysts for a long time. LDHs are a class of inorganic laye
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