Abstract:

Merrifield resin microspheres immobilized by methoxycarbonylethyl imidazolium ionic liquid(IL) with magnetism were successfully prepared. We chose FeOOH and γ-Fe2O3 as the magnetic resource and employed the simple co-precipitation method to realize the synthesis, which is feasible and will lower the overall cost for further industrial scale application if possible. In the standpoint of comparison, the IL loaded on the merrifield resin with non-magnetic was also synthesized. The structures and properties of these two kinds of microspheres were investigated by vibrating sample magnetometer(VSM), Fourier transform infrared spectroscopy(FT-IR), X-ray diffraction(XRD), thermogravimetric analysis(TGA), as well as other performance tests. The testing results validate the structures of the two microspheres with our expectation, and indicate that the thermal stability of magnetic microspheres is superior to the non-magnetic one, so its decomposition does not occur below 200 ℃. The magnetic microspheres showed super-paramagnetic and did not form aggregates when the external magnetic field was absent. Magnetic separation of the magnetic microspheres has also been carried out in a 3.0×10-4 T single direction electromagnetic field to illustrate the predominant separation efficiency of the magnetic one. The results showed that the magnetic particles could be completely separated from water within 10 s in 3.0×10-4 T electromagnetic field.

Key words: ionic liquids, magnetic microspheres, Merrifield resin, loading