Adsorption behavior and separation of vanadium(V), molybdenum(VI), and rhenium(VII) ions on crosslinked polymers containing acrylic acid derivative moieties

The radical polymerization of [2-(acryloyloxy)ethyl] trimethylammonium meth yl sulfate and [3-(methacryloylamino)propyl] trimethylammonium chloride by using ammonium peroxydisulfate as initiator and N,N'-methylene-bis-acrylami de as crosslinker agent at 70 degrees C for 17 h was carried out. The cross linker agent in the feed ranged between 2 and 6 mol %. The resins were comp letely insoluble in water and characterized by elemental analysis and FTIR spectroscopy. The metal ion binding capacity of these resins with V(V), Mo( VI), and Re(VII) were investigated using the batch equilibrium type. The pH , but not the crosslinking percentage in the feed, influenced the retention capacity of the resin, particularly for V(V) and Re(VII). Thus, at pH 1 on ly < 15% of V(V) was retained, but at pH 3 higher than 97% of V(V) was adso rbed. The resin-ion equilibrium was achieved between 15 min and 2 h dependi ng on the resin, ion, and crosslinking degree. According to the pH, it is p ossible separate Re(VII) and Mo(VI) from V(V) at pH 1.0. To reuse the resin s, the ions were stripped by using HCl, H2SO4, and Na2CO3 at different conc entrations. (C) 1999 John Wiley & Sons, Inc.