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The magnetic adsorbent, Fe 3 O 4 @[Ni(HL) 2 ] 2 H 2 [P 2 Mo 5 O 23 ]·2H 2 O (Fe 3 O 4 @ 1 ), is synthesized by employing the nanoparticles Fe 3 O 4 and polyoxometalate hybrid 1 . Zero-field-cooled (ZFC) and field-cooled (FC) curves show that the blocking temperature of Fe 3 O 4 @ 1 was at 120 K. Studies of Fe 3 O 4 @ 1 removing cationic and anionic dyes from water have been explored. The characterization of Fe 3 O 4 @ 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 Fe 3 O 4 @ 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 Fe 3 O 4 @ 1 was mainly governed via chemisorption. The maximum capacity of Fe 3 O 4 @ 1 adsorbing substance was 41.91 mg g -1 . Furthermore, Fe 3 O 4 @ 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.

Dyes Adsorption Behavior of Fe3O4 Nanoparticles Functionalized Polyoxometalate Hybrid