Adsorption has been regarded as one of the most efficient and economic methods for the removal of antibiotics from aqueous solutions. In this work, different graphene-based magnetic nanocomposites using a modified solvothermal method were synthesized and employed to remove sulfadiazine (SDZ) from water. The adsorption capacity of the optimal magnetic reduced graphene oxide (MrGO) was approximately 3.24 times that of pure Fe3O4. After five repeated adsorption cycles, the removal rate of SDZ (100 μg/L) by MrGO nanocomposites was still around 89.3%, which was only about a 3% decrease compared to that in the first cycle. Mechanism investigations showed that both chemical and physical adsorption contributed to the removal of SDZ. The excellent adsorption performance and recyclability of MrGO nanocomposites could be attributed to their wonderful 3D interconnected petal-like structures. The MrGO with SDZ could be easily recollected by magnetic separation. The MrGO also exhibited excellent adsorption performance in the purification of real polluted water.

中文翻译：

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使用 3D 互连花瓣状磁性还原氧化石墨烯 (MrGO) 纳米复合材料去除磺胺嘧啶

吸附被认为是从水溶液中去除抗生素最有效和最经济的方法之一。在这项工作中，使用改进的溶剂热法合成了不同的基于石墨烯的磁性纳米复合材料，并用于从水中去除磺胺嘧啶 (SDZ)。最佳磁性还原氧化石墨烯 (MrGO) 的吸附容量约为纯 Fe3O4 的 3.24 倍。经过五次重复吸附循环后，MrGO纳米复合材料对SDZ（100 μg/L）的去除率仍为89.3%左右，与第一次循环相比仅降低了约3%。机理研究表明，化学和物理吸附都有助于 SDZ 的去除。MrGO 纳米复合材料优异的吸附性能和可回收性可归因于其美妙的 3D 互连花瓣状结构。带有 SDZ 的 MrGO 可以通过磁分离轻松回收。MrGO在净化真正的污水中也表现出优异的吸附性能。