Abstract CoFe2O4 loaded graphene oxide (CoF/GO) was synthesized for the sono-adsorption of methylene blue (MB) and methyl violet (MV) dye. The X-ray diffraction pattern of CoF/GO nanocomposite confirmed the inter-layer growth of CoFe2O4 nanoparticles in the GO. The dye adsorption efficiency increased with the increase in pH, time, dye concentration, and adsorbent dosage. The kinetic data were fitted to the pseudo-second-order kinetics (R2 ~1) with theoretical adsorption capacities found closer to the experimental values. The adsorption process was best explained by the Freundlich model due to the heterogeneity of the surface and involvement of physical forces like electrostatic interactions and π-π interactions. The monolayer adsorption capacity was 157 and 122 mg g‒1 for MB and MV, respectively. From thermodynamic parameters, it was concluded that the adsorption process was spontaneous and endothermic. The thermally regenerated CoF/GO showed a performance loss of ~18% after the fourth cycle. From this study, it was conclusive that the magnetic CoF/GO nanocomposite could be used as an economical adsorbent for the removal of organic dyes from wastewater via the sono-adsorption process.

中文翻译：

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有机染料在 CoFeO/氧化石墨烯纳米复合材料上的声吸附

摘要 合成了负载 CoFe2O4 的氧化石墨烯 (CoF/GO)，用于亚甲蓝 (MB) 和甲基紫 (MV) 染料的声吸附。CoF/GO 纳米复合材料的 X 射线衍射图证实了 CoFe2O4 纳米颗粒在 GO 中的层间生长。染料吸附效率随着pH、时间、染料浓度和吸附剂用量的增加而增加。动力学数据拟合准二级动力学（R2~1），理论吸附容量更接近实验值。由于表面的异质性和静电相互作用和 π-π 相互作用等物理力的参与，吸附过程最好由 Freundlich 模型解释。MB和MV的单层吸附容量分别为157和122 mg g-1。从热力学参数，得出的结论是吸附过程是自发的和吸热的。热再生的 CoF/GO 在第四次循环后表现出约 18% 的性能损失。从这项研究中可以得出结论，磁性 CoF/GO 纳米复合材料可用作一种经济的吸附剂，用于通过声吸附过程去除废水中的有机染料。