磁性聚苯乙烯-氯甲基苯乙烯材料的合成及其对蒽的吸附性能研究

Study on Synthesis of Magnetic Polystyrene-Chloromethyl Styrene Material and Its Adsorption Properties for Anthracene

采用4-氯甲基苯乙烯(VBC)为单体,二乙烯基苯为交联剂(DVB),以磁性γ-甲基丙烯酰氧基丙基三甲氧基硅烷(MPS)修饰硅胶微球为核,在偶氮二异丁腈(AIBN)引发下,以甲苯和聚乙二醇2000的混合溶液(质量比1∶2)为联合致孔剂,原位聚合制备了磁性聚苯乙烯-氯甲基苯乙烯材料(Fe3O4@Si O2@DVBVBC)。通过傅立叶红外光谱(FT-IR)、X-射线衍射(XRD)和氮气物理吸附对该材料的结构和组成特性进行了表征。以蒽为考察对象,对制备材料的吸附性能进行了考察,发现单体和交联剂的质量比对材料的吸附能力影响较大。当单体和交联剂的质量比为1∶4时,对蒽的吸附性能最佳。材料的孔结构会影响吸附平衡时间。制备的材料对蒽能够在30 min内达到吸附平衡且吸附率达95%。该材料对多环芳烃化合物的吸附主要依靠疏水作用。吸附动力学研究表明,材料对蒽的吸附性能对准一级动力学方程具有较好的拟合程度。采用2 mL乙腈涡旋15 min可将99%的蒽洗脱下来。

The magnetic polystyrene-chloromethyl styrene material（Fe3O4@SiO2@DVB-VBC） was synthesized by in situ polymerization initiated with 2,2-azobisisobutyronitrile（AIBN）.4-chloromethyl styrene（VBC） and divinylbenzene（DVB） were chosen as monomer and crosslinking agent, respectively. Magnetic γ-methacryloxypropyltrimethoxysilane（MPS） modified silica microspheres were used as the cores. The mixture of toluene and polyethylene glycol 2000（1∶2,by mass） was used as the combined porogen. The structure and composition of Fe3O4@SiO2@DVB-VBC material were characterized by Fourier transform infrared spectroscopy（FT-IR）,X-ray diffraction（XRD） and nitrogen physical adsorption.The enrichment performance of Fe3O4@SiO2@DVB-VBC material was investigated by using anthracene as the target compound.The result indicated that the adsorption ability of the material could be affected by the mass ratio of monomers and crosslinking agent.Under the condition that the mass ratio of monomers and crosslinking agent was set by 1∶4,the prepared material showed the best adsorption performance for anthracene.The pore structure of the material could affect the adsorption equilibrium time.The adsorption equilibrium for authracene was achieved within 30min,and the adsorption rate was calculated to be 95%.The adsorption mechanism between aromatic compounds and the prepared adsorbentis depended mainly on the hydrophobic interaction.The study of adsorption kinetics indicated that the adsorption behavior fitted well with the pseudo first-order kinetics model.99% anthracene could be eluted from the absorbent by using 2mL of acetonitrile within 15min.