کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
40697 | 45863 | 2012 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Development of an efficient catalyst from magnetite ore: Characterization and catalytic potential in the ozonation of water toxic contaminants Development of an efficient catalyst from magnetite ore: Characterization and catalytic potential in the ozonation of water toxic contaminants](/preview/png/40697.png)
This study presents the preparation, characterization and activity of a novel natural mineral-based catalyst for the ozonation of water recalcitrant compounds. The raw and calcined magnetite had the specific surface area of 27 m2/g and 34 m2/g, respectively. The effects of solution pH, catalyst dose, model dye concentration, and reaction time on the degradation and mineralization of a selected reactive azo dye viz. Reactive Red-120 (RR-120) were evaluated. Calcined magnetite attained greater catalytic potential than the raw ore in the degradation of RR-120. Oxidation via radical species on the surface of the catalyst was the main mechanism of RR-120 degradation in the developed catalytic ozonation process, occurring with a pseudo-first-order reaction rate at a constant of 0.082 min−1 under the optimum pH of 11 and catalyst dose of 3 g/L. Accordingly, considering its abundance in nature together with its very high catalytic potential, calcined magnetite is a promising and reliable catalytic material for the ozonation of inhibitory and recalcitrant compounds in water and wastewater.
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► The work is the first to demonstrate the preparation of the calcined magnetite from magnetite ore.
► The calcined magnetite was very active in catalyzing the ozonation of the reactive azo dyes.
► The ozonation with calcined magnetite achieved a mineralization degree much greater than does single ozonation.
► The calcined magnetite powder could be efficiently reused and thus is a stable catalyst.
Journal: Applied Catalysis A: General - Volumes 445–446, 28 November 2012, Pages 42–49