王盈盈,余静,曾红杰,徐冬莹,张永强,唐韵,赵婉颖,李猷.磁性吸附剂CeO2/MZFS去除水中盐酸四环素[J].环境科学学报,2020,40(9):3250-3258
磁性吸附剂CeO2/MZFS去除水中盐酸四环素
- Adsorption of tetracycline hydrochloride by magnetic adsorbent CeO2/MZFS
- 基金项目：国家自然科学基金（No.51708050）；2018年大学生创新创业训练计划（No.201810621052）
- 王盈盈
- 成都信息工程大学资源环境学院, 成都 610225
- 余静
- 成都信息工程大学资源环境学院, 成都 610225
- 曾红杰
- 成都信息工程大学资源环境学院, 成都 610225
- 徐冬莹
- 成都信息工程大学资源环境学院, 成都 610225
- 张永强
- 成都信息工程大学资源环境学院, 成都 610225
- 唐韵
- 成都信息工程大学资源环境学院, 成都 610225
- 赵婉颖
- 成都信息工程大学资源环境学院, 成都 610225
- 李猷
- 成都信息工程大学资源环境学院, 成都 610225
- 摘要：利用废碱性电池制备得到尖晶石结构的锰锌铁氧体Mn0.6Zn0.4Fe2O4（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.
- Abstract：Magnetic manganese-zinc ferrite nanoparticles, Mn0.6Zn0.4Fe2O4 (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.
