There are various chemical, physical and biological methods that have been applied to remove antibiotic residuals from aqueous environment. We investigated the removal of ampicillin (AMP) by a novel nanometer-size Fe 3 O 4 /graphene oxide/aminopropyltrimethoxysilane (FGOA). Based on the sol-gel method, the graphene oxide (GO) was first modified by aminopropyltrimethoxysilane (APTMS) to form GOA material containing both acidic and basic surface functional groups. The nanomagnetic iron oxide was then decorated to the GOA surface at various weight ratios by ultra-sonication in ethanol, resulting in different FGOA samples. The as-synthesized FGOA had single-layer structure and parallel array-like well-distributed Fe 3 O 4 . In laboratory-scale, the AMP treatment efficiency by FGOA with the ratio of Fe 3 O 4 : GOA as 1:5 ratio reached the highest value around 94% within 100 min and only lost 1% after five regeneration cycles. The maximum adsorption capacity of FGOA was 294mg g −1 , significantly much higher than the previously published materials applied to AMP uptake. Interestingly, the optimum pH of FGOA ranged extensively from 4 to 9, revealing high application potential to real wastewater without any pH adjustment. The reasonable mechanism might be mainly attributed to electrostatic attraction, hydrophilic, and π-π interaction.

中文翻译：

---

氨苄西林吸附在胺官能化磁性氧化石墨烯上：合成、表征和去除机制

有多种化学、物理和生物方法可用于去除水性环境中的抗生素残留物。我们研究了通过新型纳米级 Fe 3 O 4 /氧化石墨烯/氨基丙基三甲氧基硅烷 (FGOA) 去除氨苄青霉素 (AMP)。基于溶胶-凝胶法，首先用氨基丙基三甲氧基硅烷（APTMS）修饰氧化石墨烯（GO），形成同时含有酸性和碱性表面官能团的GOA材料。然后通过在乙醇中超声处理将纳米磁性氧化铁以不同的重量比装饰到 GOA 表面，得到不同的 FGOA 样品。合成的 FGOA 具有单层结构和平行阵列状分布良好的 Fe 3 O 4 。在实验室规模中，FGOA 的 AMP 处理效率，Fe 3 O 4 : GOA 的比例为 1: 5 比在 100 分钟内达到最高值约 94%，在五个再生循环后仅损失 1%。FGOA 的最大吸附容量为 294mg g -1 ，明显高于先前公布的用于 AMP 吸收的材料。有趣的是，FGOA 的最佳 pH 值范围广泛，从 4 到 9，显示出对实际废水的高应用潜力，无需任何 pH 调整。合理的机制可能主要归因于静电引力、亲水性和 π-π 相互作用。无需任何 pH 值调整即可显示对实际废水的高应用潜力。合理的机制可能主要归因于静电引力、亲水性和 π-π 相互作用。无需任何 pH 值调整即可显示对实际废水的高应用潜力。合理的机制可能主要归因于静电引力、亲水性和 π-π 相互作用。