Monodispersed colloidal zinc oxide nanospheres with various size scales: synthesis, formation mechanism, and enhanced photocatalytic activity

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• 作者：Chong Yang ; Qingsong Li ; Limei Tang ; Ailing Bai ; Hao Song…
• 刊名：Journal of Materials Science
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：51
• 期：11
• 页码：5445-5459
• 全文大小：2,112 KB
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• 作者单位：Chong Yang (1)
  Qingsong Li (1)
  Limei Tang (1)
  Ailing Bai (1)
  Hao Song (1)
  Yingmin Yu (1)
  
  1. State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University of Petroleum, Qingdao, 266580, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Characterization and Evaluation Materials
  Polymer Sciences
  Continuum Mechanics and Mechanics of Materials
  Crystallography
  Mechanics
  
• 出版者：Springer Netherlands
• ISSN：1573-4803

文摘

In the present study, monodispersed colloidal zinc oxide (ZnO) nanospheres with high uniformity were successfully synthesized via a newly developed two-stage solution route, designated the seed solution method, based on a polyol-mediated preparation approach. The narrow size distribution of the synthesized ZnO nanospheres can be precisely controlled in sizes ranging from 110 nm through 330 nm during the second stage of the synthesis by varying the amount of seed solution added. The structure, composition, morphology, size, and size distribution of the as-synthesized ZnO nanospheres were characterized. The results of our experiments suggest that a core–shell growth mechanism was employed for the first time to form ZnO nanospheres. Furthermore, the as-obtained porous ZnO products, which were calcinated at 400 °C, were assessed as an efficient heterogeneous photocatalyst for photocatalytic degradation of methylene blue (MB) aqueous solution under UV-light irradiation at room temperature. Interestingly, the calcinated ZnO products exhibited photocatalytic activity that was significantly enhanced in comparison with that of uncalcinated ZnO. Moreover, particle size had a crucial effect on degradation efficiency. Reducing the particle size improved the efficiency of photocatalytic MB degradation, indicating that the photocatalytic reaction of MB on the ZnO product was a structure-sensitive reaction. The as-obtained ZnO products were easily separated from waste solutions and reused, demonstrating their significant potential as photocatalysts in environmental remediation applications.