کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1270064 | 972474 | 2012 | 6 صفحه PDF | دانلود رایگان |
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.
► Ultrasound irradiation resulted in a uniform coating of the ZnO nanoparticles with silica.
► Silica coated ZnO nanoparticles showed a significant inhibition of photocatalytic activity.
► The coated ZnO nanoparticles showed excellent UV shielding ability.
Journal: Ultrasonics Sonochemistry - Volume 19, Issue 4, July 2012, Pages 750–755