Journal
ULTRASONICS SONOCHEMISTRY
Volume 19, Issue 4, Pages 750-755Publisher
ELSEVIER
DOI: 10.1016/j.ultsonch.2011.12.011
Keywords
ZnO; Photocatalytic activity; Silica coating; Sol-gel method; Sonochemical synthesis; UV shielding
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Funding
- Venture Business Laboratory (VBL) of Utsunomiya University
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In this paper, we report the synthesis of silica coated ZnO nanoparticles by ultrasound irradiation of a mixture of dispersion of ZnO, tetraethoxysilane (TEOS), and ammonia in an ethanol-water solution medium. The silica coating layer formed at the initial TEOS/ZnO loading of 0.8 for 60 min ultrasonic irradiation was uniform and extended up to 3 nm from the ZnO surface as revealed from HR-TEM images. Silica coated ZnO nanoparticles demonstrated a significant inhibition of photocatalytic activity against photodegradation of methylene blue dye in aqueous solution. The effects of silica coating on the UV blocking property of ZnO nanoparticles were also studied. (C) 2011 Elsevier B.V. All rights reserved.
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