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首页> 外文期刊>RSC Advances >Decolorization of Acid Orange II dye by peroxymonosulfate activated with magnetic Fe3O4@C/Co nanocomposites
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Decolorization of Acid Orange II dye by peroxymonosulfate activated with magnetic Fe3O4@C/Co nanocomposites

机译：磁性Fe3O4 @ C / Co纳米复合材料活化的过氧单硫酸盐对酸性橙II染料的脱色

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New metallic cobalt loaded magnetic nanocomposites (Fe3O4@C/Co) were prepared by calcination and in situ reduction of the Co2+-impregnated magnetic carbon nanoparticles of Fe3O4@C at 900 degrees C under a nitrogen atmosphere. Fourier transform infrared spectroscopy (FT-IR), powder X-ray diffraction (XRD), vibrating sample magnetometry, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) were employed to characterize the properties of the composites and the loading of metallic Co-0 in the material was clarified. The catalytic properties of the nanocomposites Fe3O4@C/Co in activating peroxymonosulfate (PMS) for decolorization of Acid Orange II (AO II) dye in aqueous solution were investigated. Fe3O4@C/Co nanocomposites exhibited high activity in PMS activation for AO II decolorization. Complete decolorization of AO II solution could be achieved in 20 min within near neutral pH range (pH 6.4-8.5), while a complete decolorization occurred in 40 min for the as-prepared solution without pH adjustment (pH 4.05). The effects of several parameters including pH, catalyst load, PMS concentration and reaction temperature on the catalytic activity were also investigated. Sulfate free radicals activated from PMS were proposed to be the dominant active species in the "Fe3O4@C/Co + PMS" system for AO II decolorization. The catalytic and decolorization mechanism was suggested. The catalyst Fe3O4@C/Co could be recycled easily by a magnet with good reusability. This study provides a promising method for the activation of "green" oxidant, PMS, by the new magnetic nanocomposites for environmental remediation and oxidation catalysis.
机译：通过在氮气氛下于900摄氏度下煅烧并原位还原Co3 +浸渍的Fe3O4 @ C磁性碳纳米颗粒，制备了负载金属钴的新型磁性纳米复合材料（Fe3O4 @ C / Co）。使用傅里叶变换红外光谱（FT-IR），粉末X射线衍射（XRD），振动样品磁强度法，透射电子显微镜（TEM）和X射线光电子能谱（XPS）来表征复合材料的性质和载荷材料中金属Co-0的含量已得到澄清。研究了纳米复合材料Fe3O4 @ C / Co在活化过氧单硫酸盐（PMS）中使酸性橙II（AO II）染料脱色的催化性能。 Fe3O4 @ C / Co纳米复合材料在PMS活化中对AO II脱色表现出高活性。可以在接近中性pH范围（pH 6.4-8.5）的20分钟内完成AO II溶液的完全脱色，而无需调节pH（pH 4.05）的原配溶液在40分钟内可以完全脱色。还研究了pH，催化剂负载，PMS浓度和反应温度等几个参数对催化活性的影响。从PMS活化的硫酸根自由基被认为是AO II脱色的“ Fe3O4 @ C / Co + PMS”系统中的主要活性物质。提出了催化脱色机理。 Fe3O4 @ C / Co催化剂可通过具有良好可重复使用性的磁体轻松回收。这项研究为通过新型磁性纳米复合材料活化“绿色”氧化剂PMS提供了一种有前途的方法，用于环境修复和氧化催化。

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