We report here a simple approach for synthesis of carbon coated magnetite (C@MFe₂O₄, M=Co, Ni, Fe) with shell@core nanostructured composites that we used as magnetic-nanosorbents for direct yellow (DYG) and moderacid red (RS) as pollutant textile dyes removal via an adsorption process. The synthesized C@MFe₂O₄ was characterized by TEM, SEM, EDX, XRD, FT-IR and VSM techniques. TEM results indicated that C@MFe₂O₄ nanocomposites have 20–30 nm of MFe₂O₄ nanoparticle core and 2–3 nm in thickness of the amorphous carbon shell. The synthesized C@MFe₂O₄ nanocomposites have the zero point charge (pH_ZPC) at 5.5, which suggests that DYG and RS, anionic dyes can be adsorbed onto the C@MFe₂O₄ nanosorbents in the acidic medium. Adsorption of DYG and RS onto magnetic nanosorbents was optimized and adsorption thermodynamic parameters were evaluated, clearly indicating that the adsorption of RS onto synthesized magnetic-nanosorbents was facile more than that DYG. The adsorption isotherm data showed that the adsorption processes of DYG and RS onto Fe₃O₄ or C@MFe₂O₄ nanosorbents are more suitable for the Langmuir model than Freundlich model. The maximum adsorption capacity (q_max) of DYG dye onto Fe₃O₄, C@Fe₃O₄ and C@CoFe₂O₄ adsorbents was 14.641, 36.232 and 7.85 mg g⁻¹, respectively; meanwhile, these values were 41.152, 61.728 and 39.683 mg g⁻¹ for RS dye. These obtained data indicate that the developed Fe₃O₄, C@Fe₃O₄ and C@CoFe₂O₄ nanoparticles can be used as recoverable and recyclable adsorbents for not only organic pigments adsorption but also for heavy metal ion removal or protein extraction as well.

我们在此报告了一种用壳@核纳米结构复合材料合成碳包覆磁铁矿 (C@MFe ₂ O ₄ , M=Co, Ni, Fe)的简单方法，我们将其用作直接黄 (DYG) 和中酸性红的磁性纳米吸附剂(RS) 作为污染物纺织染料通过吸附过程去除。通过TEM、SEM、EDX、XRD、FT-IR和VSM技术对合成的C@MFe ₂ O ₄进行了表征。TEM结果表明，C@MFe ₂ O ₄纳米复合材料具有20-30 nm的MFe ₂ O ₄纳米颗粒核和2-3 nm厚的无定形碳壳。合成的C@MFe ₂ O ₄纳米复合材料在 5.5 时具有零点电荷 (pH _ZPC )，这表明阴离子染料 DYG 和 RS在酸性介质中可以吸附到 C@MFe ₂ O ₄纳米吸附剂上。优化了 DYG 和 RS 在磁性纳米吸附剂上的吸附，并评估了吸附热力学参数，清楚地表明 RS 在合成磁性纳米吸附剂上的吸附比 DYG 更容易。吸附等温线数据表明DYG和RS在Fe ₃ O ₄或C@MFe ₂ O ₄纳米吸附剂上的吸附过程比Freundlich模型更适合Langmuir模型。最大吸附容量（q _max) DYG 染料在 Fe ₃ O ₄、C@Fe ₃ O ₄和 C@CoFe ₂ O ₄吸附剂上的吸附量分别为 14.641、36.232 和 7.85 mg g ^-1；同时，RS 染料的这些值为 41.152、61.728 和 39.683 mg g ^-1。这些获得的数据表明，所开发的Fe ₃ O ₄、C@Fe ₃ O ₄和C@CoFe ₂ O ₄纳米颗粒可用作可回收和可回收的吸附剂，不仅可以吸附有机颜料，还可以去除重金属离子或提取蛋白质。也是。