Microwave degradation of methyl orange dye in aqueous solution in the presence of nano-TiO₂-supported activated carbon (supported-TiO₂/AC/MW)

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• 作者：Zhaohong Zhang^a ; ^{lnuhjhx@163.com} ; ^{lnuhjhx@sina.com} ; Yao Xu^a ; Xiping Ma^a ; Fangyi Li^a ; Danni Liu^a ; Zhonglin Chen^a ; Fengqiu Zhang^a ; Dionysios D. Dionysiou^b ; ^{dionysios.d.dionysiou@uc.edu}
• 关键词：Azo dye ; Activated carbon ; Degradation ; Microwave ; Supported TiO2
• 刊名：Journal of Hazardous Materials
• 出版年：2012
• 期刊代码：50_03043894
• 类别：ce
• 出版时间：30 March, 2012
• 卷：209-210
• 期：Complete
• 页码：271-277
• 文件大小：959 K

摘要

In this study, nano-TiO₂-supported activated carbon (TiO₂/AC) was developed for the microwave (MW) degradation of an azo dye, methyl orange (MO), selected as a model contaminant in aqueous solution. The effects of selected process parameters such as supported TiO₂ content, MW irradiation time, initial MO concentration, catalyst dose, and solution pH on the degradation were assessed in detail. The results showed that the supported TiO₂ on AC could be excited resulting in the production of hydroxyl radical (OH) in aqueous solution under MW irradiation, which significantly enhanced the performance of AC/MW process for the degradation of MO. Also, the supported-TiO₂/AC displayed higher catalytic activity than AC alone under MW irradiation. By comparison, the supported-TiO₂/AC/MW process exhibited several advantages, including high degradation rate, short irradiation time, no residual intermediates and no secondary pollution. Hence, it shows to be a promising technology for the destruction of organic contaminants in dye treatment applications.