Sonochemical synthesis, photocatalytic activity and optical properties of silica coated ZnO nanoparticles

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• 作者：Iqbal Ahmed Siddiquey^a ; ^b ; ^d ; ^{iqbal_siddiquey@yahoo.com} ; Takeshi Furusawa^a ; Masahide Sato^a ; Newaz Mohammed Bahadur^c ; Md. Mahbubul Alam^d ; Noboru Suzuki^a
• 关键词：ZnO ; Photocatalytic activity ; Silica coating ; Sol&ndash ; gel method ; Sonochemical synthesis ; UV shielding
• 刊名：Ultrasonics Sonochemistry
• 出版年：2012
• 期刊代码：81_13504177
• 类别：ph
• 出版时间：July, 2012
• 卷：19
• 期：4
• 页码：750-755
• 文件大小：718 K

摘要

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.