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首页> 外文期刊>RSC Advances >Solvothermal synthesis of magnetic CoFe2O4/rGO nanocomposites for highly efficient dye removal in wastewater
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Solvothermal synthesis of magnetic CoFe2O4/rGO nanocomposites for highly efficient dye removal in wastewater

机译：溶剂热合成磁性CoFe 2 O 4 / rGO纳米复合材料用于废水中的高效染料去除

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Magnetic CoFe2O4/reduced graphene oxide (rGO) (abbreviated as CFG) nanocomposites were fabricated by a simple solvothermal process. The structure and composition of the as-synthesized CFG nanocomposites were investigated by transmission electron microscopy (TEM), vibrating sample magnetometry (VSM), N2 adsorption–desorption isotherms, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. TEM images show that the uniform CoFe2O4 NPs (～11 nm) are well dispersed on the rGO nanosheets. In addition, CFG has a high surface area (239.76 m2 g?1), exhibits a strong magnetic strength (59.20 emu g?1), and can be easily separated from other constituents under an external magnetic field. When using organic dyes, such as rhodamine B (Rh B), methylene blue (MB), Congo red (CR), methyl orange (MO), and methyl green (MG), as the adsorbates, CFG showed a good adsorption performance, especially, ～100% for MB within 5 min. The maximum adsorption capacities for Rh B, MB, CR, and MG were 121.8, 93.5, 104.5, and 88.3 mg g?1, respectively. The effect of certain variables, such as temperature, pH of the initial solution, adsorbent dose, and adsorbate species, was studied in detail. All results suggested that CFG can be used as an environmentally friendly and highly efficient reusable adsorbent material with a high adsorption capacity and a fast removal rate that can be used to remove organic dyes from wastewater.
机译：磁性CoFe 2 O 4 /还原氧化石墨烯（rGO）（缩写为CFG）纳米复合材料的制备简单的溶剂热过程。通过透射电子显微镜（TEM），振动样品磁力法（VSM），N 2 吸附-解吸等温线，X研究了合成后的CFG纳米复合材料的结构和组成。射线衍射（XRD），X射线光电子能谱（XPS）和拉曼光谱。 TEM图像显示均匀的CoFe 2 O 4 NPs（〜11 nm）很好地分散在rGO上纳米片。另外，CFG具有高表面积（239.76 m 2 g ？1 ），具有很强的磁性强度（59.20 emu g <小> ？1 ），并且在外部磁场下很容易与其他成分分离。当使用若丹明B（Rh B），亚甲基蓝（MB），刚果红（CR），甲基橙（MO）和甲基绿（MG）等有机染料作为被吸附物时，CFG表现出良好的吸附性能，特别是5分钟内MB约为100％。 Rh B，MB，CR和MG的最大吸附容量分别为121.8、93.5、104.5和88.3 mg g ？1 。详细研究了某些变量的影响，例如温度，初始溶液的pH，吸附剂剂量和被吸附物种类。所有结果表明，CFG可用作具有高吸附容量和快速去除速率的环保，高效可重复使用的吸附材料，可用于去除废水中的有机染料。

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