A magnetic composite was synthesized using palm kernel shell-based activated carbon, graphene oxide (GO) and iron oxide. The morphology, textural properties, magnetic properties, crystal structure and functional groups of the composite were studied. The characterization shows the successful formation of the ternary composite with a high specific surface area (280.39 m2/g) and abundant surface functional groups. The magnetic properties of the composite indicate a saturation magnetization of 33.72 emu/g, signifying that the composite can be easily separated with an external magnetic field. The performance of the composite was then investigated through the removal of an anionic azo dye, Acid Blue 113, from aqueous solution. The effect of initial pH of the solution, adsorbent dosage and adsorption contact time was studied. The composite achieved an adsorption capacity of 32.2 mg/g and 96.3% dye removal. Effective dye removal was still achieved after five cycles of adsorption-regeneration, with the dye removal of 74% after the fifth cycle. The analyses of adsorption isotherm and kinetics show that the adsorption process fits pseudo-second-order kinetic and Langmuir isotherm models, indicating a monolayer chemisorption process. The excellent adsorption performance and reusability of the composite and its magnetic separability signify its potential as an adsorbent for wastewater treatment.

中文翻译：

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用于染料去除的磁性氧化石墨烯-生物质活性炭复合材料

使用基于棕榈仁壳的活性炭、氧化石墨烯 (GO) 和氧化铁合成了磁性复合材料。研究了复合材料的形貌、结构特性、磁性、晶体结构和官能团。表征表明成功形成了具有高比表面积 (280.39 m2/g) 和丰富的表面官能团的三元复合材料。复合材料的磁性能表明其饱和磁化强度为 33.72 emu/g，表明该复合材料可以很容易地与外部磁场分离。然后通过从水溶液中去除阴离子偶氮染料酸性蓝 113 来研究复合材料的性能。研究了溶液初始pH值、吸附剂用量和吸附接触时间的影响。该复合材料实现了 32.2 mg/g 的吸附容量和 96.3% 的染料去除率。吸附-再生五次循环后仍能有效去除染料，第五次循环后染料去除率为74%。吸附等温线和动力学分析表明吸附过程符合准二级动力学和Langmuir等温线模型，表明吸附过程为单层化学吸附过程。该复合材料优异的吸附性能和可重复使用性及其磁分离性表明其作为废水处理吸附剂的潜力。吸附等温线和动力学分析表明吸附过程符合准二级动力学和Langmuir等温线模型，表明吸附过程为单层化学吸附过程。该复合材料优异的吸附性能和可重复使用性及其磁分离性表明其作为废水处理吸附剂的潜力。吸附等温线和动力学分析表明吸附过程符合准二级动力学和Langmuir等温线模型，表明吸附过程为单层化学吸附过程。该复合材料优异的吸附性能和可重复使用性及其磁分离性表明其作为废水处理吸附剂的潜力。