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ZnO纳米棒阵列/三维石墨烯异质结的制备及光催化性能研究
Preparation and Photocatalytic Properties of ZnO Nanorod Arrays/3D Graphene

DOI: 10.12677/APP.2020.102017, PP. 139-146

Keywords: ZnO，三维石墨烯，异质结，光催化
ZnO, 3D Graphene, Hybrids, Photocatalysis

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Abstract:

本文采用CVD法在泡沫镍基底上生长三维石墨烯，再用水热法制备ZnO纳米棒阵列/三维石墨烯异质结。通过扫描电子显微镜(SEM)、X射线衍射(XRD)、拉曼(Raman)等表征方法对ZnO纳米棒阵列/三维石墨烯异质结的形貌和结构进行了分析，结果表明：生长时间为3小时的ZnO纳米棒阵列分布最为密集。紫外–可见光谱(UV-VIS)和光致发光(PL)表征结果表明：与纯ZnO纳米棒阵列相比，石墨烯与ZnO纳米棒阵列的结合可以稍微减小ZnO纳米棒阵列的带隙，降低光致发光强度。光催化实验表明：在氙灯下照射1小时后，ZnO纳米棒阵列/三维石墨烯异质结降解率达到91%，而ZnO纳米棒阵列的降解率仅为61%。而且，经过4次重复催化实验后，ZnO纳米棒阵列/三维石墨烯异质结的降解率仍可达到84%。
In this paper, CVD method was used to grow three-dimensional (3D) graphene on foam nickel, and then ZnO nanorod array was prepared on the as-synthesized 3D graphene foam by hydrothermal method. The morphology and structure of the ZnO nanorod array/3D graphene hybrids were analyzed by scanning electron microscope (SEM), X-ray diffraction (XRD), Raman and other characterization methods. The results showed that the ZnO nanorod arrays with the growth time of 3 hours are most densely distributed. UV-VIS absorption spectra (UV-VIS) and photoluminescence (PL) characterization results showed that compared with pure ZnO nanorod arrays, the combination of graphene and ZnO nanorod arrays can slightly decrease the band gap and reduce the PL intensity of ZnO nanorod arrays. Afterward, the photocatalytic performance of the samples was evaluated. The results showed that after the exposure to xenon lamp with 1 hour, the degradation rate of ZnO nanorod array/3D graphene hybrids reached 91%, while the degradation rate of ZnO nanorod array just reached 61%. More importantly, after four regeneration cycles, the photocatalytic efficiency of ZnO nanorod array/3D graphene hybrids still remained 84%.

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