Magnetic Fe3O4 nanoparticles for adsorptive removal of acid dye (new coccine) from aqueous solutions

摘要

The ability of magnetic Fe3O4 nanoparticles (MFN) to remove new coccine (NC), an acidic dye,nfrom aqueous solutions was studied. Parameters including ionic strength, pH, and temperaturenwere evaluated. MFN, prepared by precipitation method, exhibits an average particle size ofn12.5 nm, specific surface area of 85.5m2n/g, and pHzpc of 5.9. Results of kinetic adsorptionnexperiments indicated that the pseudo-second-order rate of adsorption increased with increasingninitial NC concentration. Findings also revealed that the equilibrium data could be fitted intonLangmuir adsorption isotherm. The adsorption is favored at low pH, high temperature, and lownionic strength, whereupon a maximum adsorption capacity of 1.11 £ 1024nmol/g was determinednfor NC. Thermodynamic functions indicated that the adsorption process is spontaneous andnexothermic in nature. Tests of regeneration showed that after 5 regeneration cycles thenadsorption capacity of NC decreased to 35% to its original capacity.