Article ID Journal Published Year Pages File Type
1270064 Ultrasonics Sonochemistry 2012 6 Pages PDF
Abstract

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.

Related Topics
Physical Sciences and Engineering Chemistry Chemistry (General)
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