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采用悬浮聚合法制备高分子聚羧酸-纳米Fe3O4磁性复合颗粒(PC-NMPs)。通过热重差热分析(TGA)、有机元素分析(EA)、原子吸收光谱(AAS)、X-射线衍射(XRD)、红外光谱(IR)、透射电镜(TEM)、振动样品磁强计(VSM)对合成的磁性复合颗粒进行了组成、结构、形貌、磁性等表征,并研究了其吸附和去除水中对羟基苯甲酸酯类化合物(Parabens)的性能。结果表明:合成的磁性复合颗粒平均粒径为100~150 nm,饱和磁化强度为10.66 emu/g,剩余磁化强度为0.61 emu/g,矫顽力为14.96 Oe;该磁性复合颗粒对4种常用的对羟基苯甲酸酯类化合物(Parabens)的等温吸附线基本符合Langmuir模式,对羟基苯甲酸甲酯(MPB)、对羟基苯甲酸乙酯(EPB)和对羟基苯甲酸丙酯(PPB)的饱和吸附量为556 mg/g;对羟基苯甲酸丁酯(BPB)的饱和吸附量为588 mg/g。该复合颗粒能有效去除水中对羟基苯甲酸甲酯类化合物,是潜在的环境激素吸附剂和去除剂。该复合颗粒表面富含羧基可与Parabens类化合物形成氢键、苯环间存在π-π相互作用,有利于吸附过程快速有效地进行。
Preparation of Polycarboxylic Acid - Fe3O4 Magnetic Composite Particles (PC-NMPs) by Suspension Polymerization. The samples were characterized by TGA, EA, AAS, XRD, IR, and Vibrational sample magnetometers VSM) were used to characterize the composition, structure, morphology and magnetism of the synthesized magnetic composite particles. The adsorption and removal of parabens from water were also studied. The results show that the average particle size of synthesized magnetic composite particles is 100-150 nm, the saturation magnetization is 10.66 emu / g, the remanent magnetization is 0.61 emu / g and the coercive force is 14.96 Oe. The adsorption isotherms of Parabens are in good agreement with the Langmuir model, the methyl parathionate (MPB), ethyl parahydroxybenzoate (EPB) and propylparaben (PPB) The saturated adsorption capacity was 556 mg / g. The saturated adsorption capacity of butylparaben (BPB) was 588 mg / g. The composite particles can effectively remove methylparaben compounds in water and are potential environmental hormone adsorbents and remover agents. The carboxyl groups on the surface of the composite particles can form hydrogen bonds with Parabens compounds, π-π interactions exist between the benzene rings, which facilitates the rapid and effective adsorption process.