Merrifield树脂负载咪唑基离子液体磁性微球的制备与表征

制备了Merrifield树脂负载丙酸甲酯基咪唑基离子液体磁性微球。 采用FT-IR和XRD对结构进行了表征，采用TGA和VSM分别进行了热稳定性和磁性测试。 结果表明，丙酸甲酯基咪唑基离子液体成功负载到Merrifield树脂微球上，并通过共沉淀的方法实现了微球的磁性化，其磁组分为FeOOH和γ-Fe2O3混合物。 磁性微球的热稳定性优于无磁性的Merrifield树脂负载丙酸甲酯基咪唑基离子液体微球，在200 ℃以下不发生分解。 磁性微球的磁化强度为11.364 emu/g，显示出超顺磁性，无外磁场存在时不发生团聚。 沉降实验结果表明，在磁感应强度为3.0×10-4 T电磁场作用下，磁性微球10 s内即可从水相中基本分离完全，而没有磁场作用时磁性微球粒子基本不从水相中分离。

Preparation and Characterization of Magnetic Microspheres from Merrifield Resin Immobilized by Imidazolium Ionic Liquid

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.