4.6 Article

High-performance ultraviolet-visible driven ZnO morphologies photocatalyst obtained by microwave-assisted hydrothermal method

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出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2017.11.032

关键词

ZnO; Morphology; Controlled synthesis; Oxygen vacancy; Visible photocatalysis

资金

  1. Sao Paulo Research Foundation (FAPESP) [2015/04511-5, 2014/17343-0, 2017/01267-1]
  2. National Council for Scientific and Technological Development (CNPQ) [444926/2014-3]

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The use of extensive, time-consuming synthesis and the cost of an additional element in synthesis makes difficult the synthesis of photocatalyst active under a broad wavelength range. We propose a synthesis method to obtain ZnO nanoparticles in distinctive morphologies, which lie to several photocatalytic activation conditions. The Zn precursor concentration, solvent, temperature and reaction time altered the ZnO particles morphologies. Although all synthesis parameters modification interferes in ZnO particle morphology, the most pronounced was Zn salt precursor concentration. The synthesis parameter did not interfere in the crystalline wurtzite ZnO phase and the optical characterization, indicating possibilities of ionic defects formations in ZnO lattice. The 3-D flower like ZnO structure reaches 98% of discoloration under UV illumination and 42% under visible illumination of initial rhodamine-B concentration. The good UV and visible photocatalytic active confirms that with only the modification of synthesis method without any dopant element, ZnO structure is active in large wavelength range. (C) 2017 Elsevier B.V. All rights reserved.

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