Synthesis of the mixed oxides of iron and quartz and their catalytic activities for the Fenton-like oxidation
Synthesis of the mixed oxides of iron and quartz and their catalytic activities for the Fenton-like oxidation
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DOI：
10.1016/j.catcom.2007.09.035
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发表时间：
2008-03
影响因子：
3.7
通讯作者：
K. Hanna;T. Koné;G. Medjahdi
中科院分区：
文献类型：
--
作者：
K. Hanna;T. Koné;G. Medjahdi
制备了四种铁和二氧化硅的混合氧化物，包括石英/非晶态氧化铁（Q1）、石英/磁赤铁矿（Q2）、石英/磁铁矿（Q3）和石英/针铁矿（Q4），并通过 XRD、BET 表面积和化学分析对其进行了表征。使用甲基红 (MR) 作为模型化合物，在两个 pH 值（5 和 7）下进行类芬顿氧化，检查了四种矿物氧化物的催化活性。结果发现，在pH 5时，它们的催化活性遵循Q4>Q1>Q2>Q3的顺序，而在pH 7时，趋势发生变化。催化剂对染料的吸附随pH值的变化而显着变化。 pH 5 时所有固体的最高催化活性可能是由于在此 pH 值下染料分子与催化剂表面官能团之间的静电相互作用。混合氧化物催化剂表现出低铁浸出、良好的结构稳定性并且在第二反应循环中没有性能损失。
Four mixed oxides of iron and silica including quartz/amorphous iron(III) oxide (Q1), quartz/maghemite (Q2), quartz/magnetite (Q3) and quartz/goethite (Q4) were prepared and characterized by XRD, BET surface area and chemical analyses. Catalytic activity of four mineral oxides was examined by employing methyl red (MR) as a model compound for the Fenton-like oxidation at two pH values (5 and 7). It was found that their catalytic activities follow the order Q4>Q1>Q2>Q3at pH 5, while the trend is modified at pH 7. Dye adsorption to the catalyst changed significantly with the pH value. The highest catalytic activity of all solids at pH 5 is probably due to the electrostatic interactions between the dye molecules and surface functional groups of catalyst at this pH value. The mixed oxides catalysts exhibited low iron leaching, good structural stability and no loss of performance in second reaction cycle.