中文摘要：

采用种子乳液聚合法制备了Fe3O4@P（NIPAM-co-St）温敏复合微球。利用透射电镜、红外光谱仪、Zeta粒度分析仪、热重分析仪和振动样品磁力计对微球结构进行了表征,通过紫外-可见光分光光度法研究了微球对模型有机物罗丹明B（Rh B）的吸附和磁感应脱附再生行为。结果表明,复合微球呈现多核壳结构,增加聚合体系疏水单体苯乙烯（St）用量,微球中Fe3O4含量和饱和磁感应强度降低;微球中引入适量疏水聚苯乙烯（PS）链段可以提高其对Rh B的吸附量,且酸性条件有利于微球对Rh B的吸附,吸附量可达13.31 mg/g;吸附Rh B的微球在交变磁场作用下的脱附量相对于室温条件明显提高,且微球经过5次使用后,其吸附量仍然可达8.82 mg/g,说明该微球具有良好的双重磁响应特性（磁分离响应和磁感应脱附再生）。

英文摘要：

Seed emulsion polymerization was carried out to fabricate a novel class of thermo-sensitive Fe3O4@ poly（ N-isopropylacrylamide-co-styrene） composite microspheres（ Fe3O4@ P（ NIPAM-co-St））.The structures of the as-prepared composite microspheres were characterized by TEM,FTIR,DLS,TGA and VSM. UV-Vis was employed to investigate the adsorption and magnetic-induced desorption behaviors using Rhodamine B（ Rh B） as a model molecule. The results indicated that the composite microspheres possessed a unique multi-core-shell structure. The magnetic nanoparticle content and saturation magneticinduction intensity of microspheres decreased with an increase of the St content during polymerization.Rh B adsorption performance was improved when a proper amount of hydrophobic St comonomer was introduced into microspheres. The composite microspheres showed a high Rh B adsorption capacity of up to13. 31 mg / g under an acid condition. As compared with the free desorption under room temperature,much more Rh B on the composite microspheres could be desorbed under alternating magnetic field. The adsorption capacity of composite microsphere still achieved 8. 82 mg / g after five adsorption / desorption cycles,indicating good dual-magnetic responses（ magnetic separation and magnetic-induced desorption）.