Investigation of the antibacterial and photocatalytic properties of the zeolitic nanosized AgBr/TiO₂ composites

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• 作者：Mohsen Padervand^a ; Mohammad Reza Elahifard^a ; Reza Vatan Meidanshahi^a ; Shahnaz Ghasemi^a ; Saeed Haghighi^b ; Mohammad Reza Gholami^a ; ^{gholami@sharif.edu}
• 关键词：Zeolite ; Sol&ndash ; gel ; E. coli ; Azo dye ; Photodegradation
• 刊名：Materials Science in Semiconductor Processing
• 出版年：2012
• 期刊代码：65_13698001
• 类别：ms
• 出版时间：February, 2012
• 卷：15
• 期：1
• 页码：73-79
• 文件大小：801 K

摘要

Zeolite-based Ag/AgBr and Ag/AgBr/TiO₂ photocatalysts were prepared by sol-gel and deposition methods and were characterized. Their photocatalytic activities were evaluated by inactivation of Escherichia (E.) coli and the photodegradation of Acid Blue 92 and potassium permanganate. The composites containing Ag/AgBr showed the antibacterial activity in the dark by releasing Ag⁺ ions into the medium. The results for inactivation of E. coli indicated that Ag/AgBr/TiO₂ modified photocatalyst had better antibacterial activity than Ag/AgBr/zeolite, while zeolite and TiO₂/zeolite did not show any antibacterial activity under visible light and dark conditions. Photodecolarization rate was affected differently in the presence of H₂O₂ depending upon the illumination source. Under visible light the photodecolorization rate is decreased while with UV light it is increased initially and then decreased by increasing hydrogen peroxide concentration. A mechanism for KMnO₄ photodegradation is proposed. The effects of catalyst concentration, initial dye concentration and temperature were also studied.