A batch system was applied to investigate the behavior of adsorption of methylene blue (MB) and crystal violet (CV) from aqueous solution using a renewable magnetic alginate composite containing graphene oxide (M-GO/Alg) in single and binary systems. The surface morphology and chemical structure of the adsorbent were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), and vibrating sample magnetometer (VSM) analysis. The experimental data were fitted by the isotherm models and adsorption kinetics. And the maximum adsorption quantity of MB and CV reached 459.85 and 69.46 mg/g at 298 K for M-GO/Alg, respectively, as deduced from Langmuir model. After five successive adsorptive removal cycles for both dyes, no significant performance loss was observed for M-GO/Alg. Moreover, M-GO/Alg was easily separated under an external magnetic field. In binary system, MB and CV exhibited competitive adsorption. The obtained results suggested that M-GO/Alg can be used as an eco-friendly and recyclable adsorbent to remove cationic dyes from aqueous solutions.

应用批处理系统来研究在单一和二元系统中使用含有氧化石墨烯 (M-GO/Alg) 的可再生磁性海藻酸盐复合材料从水溶液中吸附亚甲基蓝 (MB) 和结晶紫 (CV) 的行为。通过扫描电子显微镜（SEM）、X射线衍射（XRD）、热重分析（TGA）和振动样品磁强计（VSM）分析对吸附剂的表面形貌和化学结构进行了表征。实验数据由等温线模型和吸附动力学拟合。由 Langmuir 模型推断，M-GO/Alg 在 298 K 时 MB 和 CV 的最大吸附量分别达到 459.85 和 69.46 mg/g。在两种染料连续五次吸附去除循环后，没有观察到 M-GO/Alg 的显着性能损失。而且，M-GO/Alg 在外部磁场下很容易分离。在二元体系中，MB和CV表现出竞争吸附。所得结果表明，M-GO/Alg 可作为一种环保且可回收的吸附剂，用于去除水溶液中的阳离子染料。