Dyes Adsorption Behavior of Fe(3)O(4) Nanoparticles Functionalized Polyoxometalate Hybrid

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.