Homogeneous catalytic ozonation of C.I. Reactive Red 2 by metallic ions in a bubble column reactor

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• 作者：Chung-Hsin Wu ; Chao-Yin Kuo ; Chung-Liang Chang
• 关键词：O₃ ; Mn(II) ; Fe(II) ; Fe(III) ; Zn(II) ; Co(II) ; Ni(II) ; Catalytic ozonation
• 刊名：Journal of Hazardous Materials
• 出版年：2008
• 期刊代码：50_03043894
• 类别：ce
• 出版时间：15 June 2008
• 卷：154
• 期：1-3
• 页码：748-755
• 文件大小：743 K

摘要

This study elucidates the decolorization of C.I. Reactive Red 2 (RR2) by homogeneous catalytic ozonation. The effects of pH and catalyst dosage were evaluated in O₃/Mn(II), O₃/Fe(II), O₃/Fe(III), O₃/Zn(II), O₃/Co(II) and O₃/Ni(II) systems. In O₃/Mn(II), O₃/Fe(II) and O₃/Fe(III) systems, increasing the catalyst concentration increased the rate of RR2 decolorization; however, further increasing the catalyst concentration caused no further significant increase. When 0.6 mM catalyst was added, the decolorization rates of O₃/Mn(II), O₃/Fe(II), O₃/Fe(III), O₃/Zn(II), O₃/Co(II) and O₃/Ni(II) systems at pH 2 were 3.295, 1.299, 1.278, 1.015, 0.843 and 0.822 min⁻¹, respectively. Under all of the experimental conditions, the decolorization efficiency of catalytic ozonation exceeded that of ozonation alone. The decolorization rate markedly exceeds the TOC removal rate in all tested systems. The effect of the radical scavenger on the catalytic ozonation processes suggests that the decolorization reaction in catalytic ozonation systems proceeds by mainly radical-type mechanisms, except in the O₃/Mn(II) system.