Magnetic Hydrogels for Removal of Humic Acid from Aqueous Environment

摘要

Magnetic cationic hydrogels (MCH) were synthesized and its removal efficiency and mechanisms to humic acid (HA) from the aqueous environment were studied in this paper. MCH synthesized had a low swelling ratio and the strong magnetism, yielding extra potential for recycle and reuse of hydrogels. XRD analysis and dissolution experimental results indicated that γ-Fe2O3 was stably embedded into hydrogels. Batch studies indicated that the removal of HA by MCH was effective. Electrostatic adsorption was considered to be main removal mechanisms of HA. Solution environments with low pH and high ionic strength were unfavorable for HA removal. 10% NaCl solution was effective to regenerate MCH saturated by HA. MCH was found still to retain high adsorption capacity to HA after three cycles.