关键词: 羧甲基纤维素, 铁酸锌, 磁性水凝胶, 左氧氟沙星, 吸附

Abstract: Aiming at the shortcomings of traditional adsorption materials, such as low adsorption capacity,  difficulty in solid-liquid separation,  and easy to lead to secondary pollution,  carboxymethyl cellulose (CMC),  polyvinyl alcohol (PVA),  acrylic acid (AA),  and zinc ferrite (ZnFe₂O₄) were used as monomers to prepare CMC/PVA/PAA/ZnFe₂O₄ cellulose based magnetic hydrogels that was easy to form,  low toxicity,  large adsorption capacity,  and could be separated by magnetic remote control through aqueous solution polymerization. Their morphological structure and structural performance were characterized by scanning electron microscopy (SEM),  Fourier transform infrared spectroscopy (FT-IR),  X-ray diffraction (XRD),  and vibrating sample magnetometer (VSM). The adsorption kinetics and thermodynamics were used to investigate their adsorption performance on levofloxacin (LEV) in water and adsorption mechanism. The results show that loaded ZnFe₂O₄  magnetic nanoparticles can increase the magnetic remote separation ability and adsorption ability of hydrogels.   The maximum adsorption capacity of the hydrogel for LEV can reach 405 mg/g at 25 ℃,  pH=5 and 4 h of adsorption,  and its adsorption capacity can still reach 84% of the original adsorption capacity after five adsorption and desorption experiments.  The adsorption process of hydrogel for LEV is more in line with the quasi second order reaction kinetics and intraparticle diffusion model,  and follows the Freundlich isotherm model. 

Key words: carboxymethylcellulose,  , zinc ferrite, magnetic hydrogel,  , levofloxacin,  , adsorption