期刊
ADVANCED POWDER TECHNOLOGY
卷 25, 期 1, 页码 372-378出版社
ELSEVIER
DOI: 10.1016/j.apt.2013.06.004
关键词
Sol-gel assisted hydrothermal method; pH; Morphology; Photocatalysis
资金
- National Natural Science Foundation of China [21073055]
- Basic Scientific and Technological Frontier Project of Henan Province, PR china [112300410207]
- Henan Normal University Science Foundation for Young Scholars [2010qk06]
ZnO microstructures of different morphologies were synthesized by the sol-gel assisted hydrothermal method using Zn(NO3)(2), citric acid and NaOH as raw materials. Twining-hexagonal prism, twining-hexagonal disk, sphere and flower-like ZnO microstructures could be synthesized only through controlling the pH of the hydrothermal reaction mixture at 11, 12, 13 and 14, respectively. The as-synthesized samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM). Optical properties were examined by UV-Vis absorption/diffuse reflectance spectroscopy and room-temperature photoluminescence measurements (PL). Photocatalytic activities of the samples were evaluated by degradation of Reactive Blue 14 (KGL). The results indicated that the flower-like ZnO composed of nanosheets possessed superior photocatalytic activity to other ZnO microstructures and commercial ZnO, which could be attributed to the morphology, surface defects, band gap and surface area. The formation mechanisms of different ZnO morphologies were also investigated based on the experimental results. (C) 2013 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.
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