纳米Fe3O4／PS-EDTA功能微球的制备及对Cu2＋的吸附性能

摘要

The nano magnetic composite microspheres(Fe3 O4/PS‐EDTA)were prepared by polymerization and substitution reaction .First ,the Fe3 O4/PS particles were prepared through polymerization of styrene(st) in the surface of Fe3 O4 S.econd ,hydrogen atoms of Fe3 O4/PS were substituted in proper order by chlorine ,ehylenedia‐mine and acetic acid .The synthesized Fe3 O4/PS‐EDTA were characterized by scanning electron microscopy (SEM ) ,X‐ray diffraction ,thermogravimetric (TGA ) analysis ,Fourier transform infrared (FT‐IR) spectrome‐ter and ultraviolet spectrophotometer .Results show that EDTA were effectively connected with chemical bond to the surface of nano‐magnetic Fe3 O4/PS with uniform particle size .The adsorption dynamic process fit the Langmuir isotherms well with a maximum adsorption capacity of 98 5.9 mg/g for Cu2+ and the adsorption kinet‐ics followed the mechanism of the pseudo‐second order equation .%以磁性纳米Fe3 O4为核，利用苯乙烯（St）聚合对其进行包覆，并进一步对表面进行氯取代、乙二胺取代及氯乙酸取代反应，制备了 Fe3 O4／PS‐EDTA 纳米磁性复合微球。利用扫描电子显微镜（SEM ）、X射线衍射分析（XRD）、热重（TGA）分析、傅里叶变换红外（FT‐IR）光谱仪、紫外分光光度计等对 Fe3 O4／PS‐EDTA微球性能进行了表征。结果表明，EDTA 有效地以化学键合方式连接到纳米磁性Fe3 O4／PS 表面，且粒径均匀。 Fe3 O4／PS‐EDTA 对 Cu2＋表现出了良好的吸附性能，饱和吸附量为98．59 m g／g ，吸附等温数据符合Langmuir模型，吸附动力学符合拟二级反应动力学模型。