磁性吸附剂CeO2/MZFS去除水中盐酸四环素

利用废碱性电池制备得到尖晶石结构的锰锌铁氧体Mn_0.6Zn_0.4Fe₂O₄（MZF），利用原位聚合制备得到硅包覆的磁性纳米复合物MZF@SiO₂（MZFS），采用浸渍法制备得到集磁分离、吸附与类Fenton催化活性于一体的CeO₂/MZFS磁性吸附剂，并对其形貌和磁性能等进行了表征.结果表明，CeO₂/MZFS对水中盐酸四环素（TH）表现出良好的吸附性能，160 min吸附过程可达平衡，TH的去除率达到95%.吸附过程可用准二级动力学方程描述，化学吸附为速控步骤；Freundlich等温吸附模型能较好地描述该吸附过程，热力学计算结果表明，CeO₂/MZFS对TH的吸附是以物理吸附为主的自发吸热过程；利用红外光谱初步揭示了吸附机制.吸附TH后的CeO₂/MZFS可利用其非均相类Fenton催化活性以H₂O₂作为再生剂进行原位再生，6次循环使用后，CeO₂/MZFS对TH仍能保持较高的平衡吸附量.研究结果可为抗生素废水的治理提供理论指导和技术支持.

Adsorption of tetracycline hydrochloride by magnetic adsorbent CeO2/MZFS

Magnetic manganese-zinc ferrite nanoparticles, Mn_0.6Zn_0.4Fe₂O₄ (MZF), with spinel structure was prepared by waste alkaline batteries and silicon-coated magnetic nanocomposite MZF@SiO₂ (MZFS) was prepared by in-situ polymerization. Then magnetic adsorbent CeO₂/MZFS was prepared by impregnation and its structure, morphology, and magnetic properties were characterized. With multiple properties such as magnetic separation, adsorption, and Fenton-like activity, CeO₂/MZFS showed good adsorption performance on tetracycline hydrochloride (TH) in water. The adsorption process reached equilibrium in 160 minutes, with removal rate of TH at 95%. The Freundlich isotherm adsorption model was applicable to fit the TH removal process and the kinetics was found to follow a pseudo-second-order kinetic model, suggesting that chemical adsorption was the rate-limiting step. The thermodynamic calculation results showed that the adsorption of TH by CeO₂/MZFS is a spontaneous endothermic process dominated by physical adsorption. The adsorption mechanism was preliminarily revealed by infrared spectroscopy. The TH-binding CeO₂/MZFS can be regenerated in situ using H₂O₂ as regeneration agent by its heterogeneous Fenton-like catalytic activity. After 6 cycles of adsorption-desorption, CeO₂/MZFS still maintains a high equilibrium adsorption capacity for TH. The findings of this research can provide theoretical guidance and technical support for treatment of antibiotic wastewater.