Magnetic Field Effects on the Adsorption of Metal Ions onto the Ion-exchange Resin

Abstract

Adsorption of metal ions onto the Dowex cation ion-exchange resin, HCR-W2, and ratedetermining steps of the adsorption reaction were examined by means of a batch method in the presence of magnetic field. Metal ions used were Fe(III), Ni(II), Co(II), Cu(II) and Zn(II). The magnetic flux density was 0.25T. Adsorption rates of Fe(III) and Ni(II) i ons were increased by about 5-10% by the presence of the magnetic field. Magnetic field does not affect on the degree of swelling, the structure of the resin, viscosities and electric conductivities of sample solutions, and total ion exchange capacities. It was found that the rate-determining step of Fe(III) adsorption is the diffusion in the particles, and its diffusion coefficient is increased from 1.01 x 10^-7 to 1.35 x 10^-7 cm²⋅s- by the presence of the magnetic field. The ion exchange reaction pf Ni(II) ion was found to be governed by particlediffusion and ion exchange reaction, and its rate constant is increased from 3.00 x 10^-5 to 3.44 x 10^-5 s^-1 by the presence of the magnetic field.