In this study, a modified copper ferrite/NiMgAl layered double hydroxide (CuFe₂O₄/NiMgAl-LDH) composite was developed for the adsorptive removal of oxytetracycline hydrochloride (OTC) antibiotic from aqueous solution. Material characterization by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Fourier transforms infrared spectrum (FTIR) and X-ray photoelectron spectroscopy (XPS) confirms that the resultant material composes of a hexagonal layered doubled hydroxide structure with surficial deposits on CuFe₂O₄ cubes. The adsorption of OTC onto the prepared materials were studied as a function of solution pH, initial OTC concentration, reaction time and temperature. The OTC adsorption capacities of the prepared materials were as follows: CuFe₂O₄/NiMgAl-LDH composite > NiMgAl-LDH > CuFe₂O₄. The adsorption of OTC in the presence of salts like CuSO₄, NaHCO₃, NaCl were also studied and the results revealed that CuSO₄ has a positive effect on OTC adsorption while NaHCO₃ and NaCl showed the neutral and antagonistic effect. The results revealed that hydrogen bonding, anionic exchange, and electrostatic forces were mainly involved in the adsorption of OTC onto CuFe₂O₄/NiMgAl-LDH composite. OTC adsorption followed the pseudo-second-order kinetic model while the adsorption equilibrium data were well fitted to the Langmuir isotherm model with the maximum adsorption capacity of 192 mg/g at 323K. Furthermore, the thermodynamic study revealed that the adsorption process was spontaneous and endothermic.

在本研究中，开发了一种改性的铁氧体/ NiMgAl层状双氢氧化物（CuFe ₂ O ₄ / NiMgAl-LDH）复合材料，用于从水溶液中吸附去除盐酸四环素（OTC）抗生素。通过X射线衍射（XRD），扫描电子显微镜（SEM），傅立叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）对材料进行表征，证实了所得材料由六角形双层氢氧化物结构和表面沉积物组成在CuFe ₂ O _4上立方体。研究了溶液中pH值，初始OTC浓度，反应时间和温度对OTC在制备材料上的吸附作用。制备材料的OTC吸附能力如下：CuFe ₂ O ₄ / NiMgAl-LDH复合材料> NiMgAl-LDH> CuFe ₂ O ₄。还研究了CuSO ₄，NaHCO ₃，NaCl等盐存在下OTC的吸附，结果表明CuSO ₄对OTC的吸附具有积极作用，而NaHCO ₃NaCl表现出中性和拮抗作用。结果表明，氢键，阴离子交换和静电力主要参与OTC在CuFe ₂ O ₄ / NiMgAl-LDH复合材料上的吸附。OTC吸附遵循伪二级动力学模型，而吸附平衡数据与Langmuir等温线模型完全吻合，在323K下的最大吸附容量为192 mg / g。此外，热力学研究表明吸附过程是自发的并且是吸热的。