Hydrothermal synthesis of ZnO Crystals: Diverse morphologies and characterization of the photocatalytic properties

IF 2.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Polyhedron Pub Date : 2023-09-30 DOI:10.1016/j.poly.2023.116668

Xuehua Zhang , Li Zhou , Xiaoyu Tu , Fangren Hu

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Abstract

Zinc oxide (ZnO) microstructures including the ZnO nanorods (R-ZnO), ZnO nanopillars (C-ZnO), and multistage microspheres composed of ZnO nanosheets (M-ZnO) have been synthesized using a two-step hydrothermal approach by adjusting the concentrations of the growth solution. Scanning Electron Microscopy (SEM) was employed to observe the surface morphology of the fabricated samples. X-ray diffraction (XRD) was utilized for the structure characterization, which the results reveal a hexagonal wurtzite ZnO structure in all three samples with different microstructures. X-ray Photoelectron Spectroscopy (XPS) was used to investigate their defects, indicating that the oxygen vacancy ratios were 34.3 %, 21.8 %, and 51.5 % respectively for R-ZnO, C-ZnO, and M-ZnO. The band gaps of R-ZnO, C-ZnO, and M-ZnO, determined through Ultraviolet–Visible Absorption Spectroscopy (UV–Vis), were found to be 3.35 eV, 3.6 eV, and 3.19 eV, respectively. Finally, the photocatalytic performances of the prepared ZnO samples were investigated under simulated sunlight irradiation by observing the degradation of methyl orange, which the M-ZnO samples obtained a superior photocatalytic efficiency of 79 %.

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水热合成ZnO晶体:不同形态和光催化性能的表征

通过调节生长溶液的浓度，采用两步水热法合成了氧化锌（ZnO）微结构，包括ZnO纳米棒（R-ZnO）、ZnO纳米柱（C-ZnO）和由ZnO纳米片组成的多级微球（M-ZnO）。采用扫描电子显微镜（SEM）观察了制备的样品的表面形貌。利用X射线衍射（XRD）对结构进行了表征，结果表明，三种不同微观结构的样品均为六方纤锌矿ZnO结构。利用X射线光电子能谱（XPS）研究了它们的缺陷，表明R-ZnO、C-ZnO和M-ZnO的氧空位率分别为34.3%、21.8%和51.5%。通过紫外-可见吸收光谱（UV–Vis）测定，R-ZnO、C-ZnO和M-ZnO的带隙分别为3.35 eV、3.6 eV和3.19 eV。最后，通过观察甲基橙的降解，研究了所制备的ZnO样品在模拟阳光照射下的光催化性能，M-ZnO样品获得了79%的优异光催化效率。

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来源期刊

Polyhedron 化学-晶体学

CiteScore

4.90

自引率

7.70%

发文量

515

审稿时长

2 months

期刊介绍： Polyhedron publishes original, fundamental, experimental and theoretical work of the highest quality in all the major areas of inorganic chemistry. This includes synthetic chemistry, coordination chemistry, organometallic chemistry, bioinorganic chemistry, and solid-state and materials chemistry. Papers should be significant pieces of work, and all new compounds must be appropriately characterized. The inclusion of single-crystal X-ray structural data is strongly encouraged, but papers reporting only the X-ray structure determination of a single compound will usually not be considered. Papers on solid-state or materials chemistry will be expected to have a significant molecular chemistry component (such as the synthesis and characterization of the molecular precursors and/or a systematic study of the use of different precursors or reaction conditions) or demonstrate a cutting-edge application (for example inorganic materials for energy applications). Papers dealing only with stability constants are not considered.