Ion-exchange properties of 4-vinylpyridine-divinylbenzene- based anion exchangers for ferric chloride complex anions

摘要

4-vinylpyridine-divinylbenzene-based anion exchangers were synthesized by suspension polymerization. Diluent mixtures containing a range of cyclohexane to cyclohexanone ratio were employed to dilute monomers at the time of polymerization. The ion exchangers were characterized for porosity, ion exchange capacity and t_1/2 for exchange of (FeCl_4)~- ions adsorbed On resins and those in the surrounding solution. A gradual increase of cyclohexane fraction in the diluents from 0/100 to 100/100 Resulted in: A gradual increase in pore volume from 0.1 to 1.6 ml/g; shift of pore diameter of major fraction of pores from < 0.01 to >0.5 μm; and a decrease in breakthrough volume capacity for (FeCl_4)~- from 0.7 to 0.2 meq/ml. The t_1/2 value decreased from 63 to 8 s followed by an increase to 70 s at )/100, 50/100 and 100/100 cyclohexane in the diluents, respectively.