Abstract Mesoporous carbon/cobalt ferrite (C/CFO) nanocomposite, as a novel charge and pH independent adsorbent with easy magnetic separation performance, was developed. The adsorption characteristics are examined by batch adsorption tests, which indicate that the C/CFO nanocomposite can be used for the removal of both cationic dye (e.g. Methylene Blue, MB) and anionic dye (e.g. Congo Red, CR) within a wide solution pH range (from 3 to 11). The Langmuir isotherm and the pseudo-second-order kinetic model can be used to describe the adsorption of both dyes onto nanocomposite. The maximum adsorption capacities for MB and CR calculated from Langmuir isotherm model are 43.05 and 270.64 mg/g, respectively. The ion-π interaction between microcrystal graphite in the nanocomposite and dye molecules is postulated to be the adsorption mechanism, evidenced by Raman spectra. Adsorption thermodynamics show that both MB and CR adsorptions are spontaneous and exothermic. The nanocomposite with adsorbed dyes can be easily detached from solution within 3 min upon the application of magnetic field. Recycling experiments show that 97.6% and 75.3% of initial adsorption capacity for CR and MB can be retained in the third cycle.

中文翻译：

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介孔碳/钴铁氧体纳米复合材料：一种用于染料污染物处理的不依赖电荷和 pH 值的磁性吸附剂

摘要 介孔碳/铁氧体钴（C/CFO）纳米复合材料作为一种新型的电荷和pH无关的吸附剂，具有易磁分离性能。通过批量吸附试验检测吸附特性，表明C/CFO纳米复合材料可用于在较宽的溶液pH范围内去除阳离子染料（如亚甲蓝、MB）和阴离子染料（如刚果红、CR）范围（从 3 到 11）。Langmuir 等温线和准二级动力学模型可用于描述两种染料在纳米复合材料上的吸附。从 Langmuir 等温线模型计算的 MB 和 CR 的最大吸附容量分别为 43.05 和 270.64 mg/g。纳米复合材料中的微晶石墨与染料分子之间的离子-π相互作用被假定为吸附机制，由拉曼光谱证明。吸附热力学表明 MB 和 CR 吸附都是自发的和放热的。在施加磁场后，具有吸附染料的纳米复合材料可以在 3 分钟内从溶液中轻松分离。回收实验表明，CR 和 MB 的初始吸附容量的 97.6% 和 75.3% 在第三个循环中可以保留。