Magnetically Separable and Durable MnFe2O4 for Efficient Catalytic Ozonation of Organic Pollutants

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• 作者：Jun Chen ; Weijie Wen ; Linjun Kong ; Shuanghong Tian ; Fuchuan Ding ; Ya Xiong
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：April 16, 2014
• 年：2014
• 卷：53
• 期：15
• 页码：6297-6306
• 全文大小：477K
• 年卷期：v.53,no.15(April 16, 2014)
• ISSN：1520-5045

文摘

Magnetically separable MnFe₂O₄ was prepared successfully by a sol鈥揼el combustion method. The synthesized MnFe₂O₄ was characterized by X-ray diffraction (XRD), scanning electronic microscopy (SEM), Brunauer鈥揈mmett鈥揟eller (BET) surface area, zeta potential, and magnetic hysteresis loops. The catalytic activity of MnFe₂O₄ was evaluated by the ozonation of 4-chlorophenol (4-CP) at different solution pH value, ozone gas concentration, MnFe₂O₄ dosage, and initial 4-CP concentration. The ozone consumption was monitored and the 路OH exposure was calculated in different processes. It was found that MnFe₂O₄ was highly effective in catalyzing ozone decomposition and favored to generate more hydroxyl radicals. Moreover, the synergistically catalytic effect between Mn and Fe in MnFe₂O₄ was confirmed. Finally, lifetime of MnFe₂O₄ was measured in a novel integrated membrane-heterogeneous catalytic ozonation reactor designed for the first time. All the experimental results show that MnFe₂O₄ is a highly recoverable, efficient, and durable catalyst in the ozonation.