Fan Siyu, Qu Yifan, Yao Lixian, Ren Jianhao, Luque Rafael, He Zhili, Bai Cuihua
College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China.
Departamento de Quımica Organica, Universidad de Cordoba, Edificio Marie-Curie (C-3), Ctra Nnal IV-A, Km 396, Cordoba, Spain; Peoples Friendship University of Russia (RUDN University), 6 Miklukho Maklaya Str., 117198 Moscow, Russia.
J Colloid Interface Sci. 2021 Mar 15;586:433-444. doi: 10.1016/j.jcis.2020.10.107. Epub 2020 Oct 28.
The presence of large amounts of antibiotic residues can potentially threaten environmental sustainability and human health. Thus, it is imperative to develop convenient and effective technologies for eliminating antibiotics from aquatic environments, which are major contaminant reservoirs. Herein, based on Zn/Fe-MIL-88B, we designed and synthesized a magnetic nanocomposite (MC) that contains hierarchical pores and as an effective and regenerative adsorbent for the removal of chlortetracycline (CTC) from water. The characteristics of the MC and its CTC adsorption performance were investigated systematically. The synthesized MC sample pyrolyzed at 800 °C (MC-800) consisted of metallic iron and N/O-doped graphitic carbon along with cluster-like particles with a mesoporous structure. Further, the adsorption of CTC on MC-800 (maximum adsorption amount of 1158.0 mg/g) could be described using the Freundlich isotherm model and a pseudo-second-order model, indicating that the surface of MC-800 was heterogeneous. The adsorption is likely driven by weak chemical forces, including hydrogen bond formation, cation-π electron donor-acceptor (EDA), and π-π EDA interactions. Finally, MC-800 could be recovered readily through facile magnetic separation and regenerated such that its adsorption rate remained higher than 85% even after five cycles.
大量抗生素残留的存在可能会对环境可持续性和人类健康构成潜在威胁。因此，开发便捷有效的技术以从作为主要污染物储存库的水环境中去除抗生素势在必行。在此，基于Zn/Fe-MIL-88B，我们设计并合成了一种具有分级孔隙的磁性纳米复合材料（MC），作为从水中去除金霉素（CTC）的有效且可再生的吸附剂。系统研究了MC的特性及其对CTC的吸附性能。在800℃下热解的合成MC样品（MC-800）由金属铁、N/O掺杂的石墨碳以及具有介孔结构的簇状颗粒组成。此外，CTC在MC-800上的吸附（最大吸附量为1158.0mg/g）可用Freundlich等温线模型和准二级模型来描述，这表明MC-800的表面是不均匀的。吸附可能是由弱化学力驱动的，包括氢键形成、阳离子-π电子供体-受体（EDA）和π-π EDA相互作用。最后，MC-800可以通过简便的磁分离轻松回收并再生，以至于即使经过五个循环，其吸附率仍保持高于85%。
