The occurrence of pharmaceuticals in the environment and the water cycle, even at trace levels, has been a matter of great discussion in the literature in the recent years. Despite the clinical relevance of diclofenac (DCF), several studies indicate that it is one of the most frequently detected anti-inflammatory drugs in surface waters, with potential harmful impact on environment and human health. Herein, novel magnetic hybrid nanosorbents composed of magnetite cores encapsulated within a siliceous network highly enriched in a quaternary chitosan (HTCC) were successfully prepared and tested in magnetically assisted removal of sodium diclofenac from aqueous solutions. The DCF adsorption by the produced core–shell nanoparticles was assessed based on several experimental parameters. It was found that under optimal conditions, the modelling of the equilibrium data was best fit with Langmuir and Toth models where the maximum adsorption capacity of DCF was 240.4 mg/g. These results indicate that these hybrid biosorbents are among the most effective magnetic systems for the removal of this pharmaceutical from water. Through the strategy proposed in this work, novel hybrid magnetic nanoparticles containing a cationic surface charge in a broad pH range, from acidic to neutral pH values, is reported. Therefore, these materials may provide a new way of removing a wider class of other anionic contaminants from water.

近年来，即使在痕量水平下，环境和水循环中药物的出现也引起了很大的讨论。尽管双氯芬酸（DCF）在临床上具有相关性，但多项研究表明，双氯芬酸是地表水中最常见的抗炎药之一，对环境和人类健康具有潜在的有害影响。在这里，成功地制备了新型磁性杂化纳米吸附剂，该磁性杂化纳米吸附剂由包裹在硅酸盐网络中的磁铁矿芯组成，该硅酸盐网络高度富集季铵壳聚糖（HTCC），并在磁性辅助下从水溶液中去除了双氯芬酸钠。根据几个实验参数评估了产生的核壳纳米颗粒对DCF的吸附。发现在最佳条件下，平衡数据的模型最适合Langmuir和Toth模型，其中DCF的最大吸附容量为240.4 mg / g。这些结果表明，这些杂化生物吸附剂是从水中去除这种药物的最有效的磁性系统之一。通过这项工作中提出的策略，已报道了新型的杂化磁性纳米粒子，该纳米粒子在从酸性到中性pH值的宽pH范围内均包含阳离子表面电荷。因此，这些材料可以提供一种从水中去除更广泛类别的其他阴离子污染物的新方法。这些结果表明，这些杂化生物吸附剂是从水中去除这种药物的最有效的磁性系统之一。通过这项工作中提出的策略，已报道了新型的杂化磁性纳米粒子，该纳米粒子在从酸性到中性pH值的宽pH范围内均包含阳离子表面电荷。因此，这些材料可以提供一种从水中去除更广泛类别的其他阴离子污染物的新方法。这些结果表明，这些杂化生物吸附剂是从水中去除这种药物的最有效的磁性系统之一。通过这项工作中提出的策略，报告了新型的杂化磁性纳米粒子，该纳米粒子在从酸性到中性pH值的宽pH范围内均包含阳离子表面电荷。因此，这些材料可以提供一种从水中去除更广泛类别的其他阴离子污染物的新方法。