Dyes Adsorption Behavior of Fe3O4 Nanoparticles Functionalized Polyoxometalate Hybrid

摘要

The magnetic adsorbent, Fe3O4@[Ni(HL)2]2H2[P2Mo5O23]·2H2O (Fe3O4@>1), is synthesized by employing the nanoparticles Fe3O4 and polyoxometalate hybrid >1. Zero-field-cooled (ZFC) and field-cooled (FC) curves show that the blocking temperature of Fe3O4@>1 was at 120 K. Studies of Fe3O₄@>1 removing cationic and anionic dyes from water have been explored. The characterization of Fe₃O₄@>1, effects of critical factors such as dosage, the concentration of methylene blue (MB), pH, adsorption kinetics, isotherm, the removal selectivity of substrate and the reusability of Fe₃O₄@>1 were assessed. The magnetic adsorbent displayed an outstanding removal activity for the cationic dye at a broad range of pH. The adsorption kinetics and isotherm models revealed that the adsorption process of Fe₃O₄@>1 was mainly governed via chemisorption. The maximum capacity of Fe₃O₄@>1 adsorbing substance was 41.91 mg g⁻¹. Furthermore, Fe₃O₄@>1 showed its high stability by remaining for seven runs of the adsorption-desorption process with an effective MB removal rate, and could also be developed as a valuable adsorbent for dyes elimination from aqueous system.