四氧化三铁/聚丙烯酸甲酯微球吸附金属离子

Adsorption Properties of Fe_3O_4/Poly(acrylate-methyl-ester) Magnetic Microspheres for Metal Ions

以二乙烯基苯为交联剂,采用悬浮聚合法制备 Fe_3O_4/聚丙烯酸甲酯磁性微球,并经胺基化改性后制得一种新型吸附剂(FADA)。采用扫描电镜(SEM),X 射线衍射(XRD),红外光谱(IR),热重分析(TGA)等手段分析了它的结构特点,并考察了它对金属离子的吸附性能。实验结果表明,FADA 粒径为35～55μm,FADA 中 Fe_3O_4质量分数约为18%。FADA 吸附 Hg^(2+),Cu^(2+)和Ni^(2+)的等温线符合Langmuir 模型,且饱和吸附容量分别为为2.3,2.2和1.1 mmol/g,采用 Lagergrent 方程计算的吸附速率常数分别为0.023,0.034和0.036 min^(-1)。FADA 的再生和重复使用实验表明,该吸附剂具有良好的再生性能和重复使用性能。

A novel adsorbent （FADA） was obtained by modifying Fe3O4/poly（acrylate methyl ester） magnetic microspheres which were prepared by suspension polymerization using divinybenzene as a crosslinker. FADA was characterized by scanning electron microscopy （SEM）, X-ray diffraction patterns （XRD）, infrared spectrometry （IR） and thermogravimetric analysis （TGA）. And the adsorption performance of FADA toward metal ions was investigated. The experimental results showed that the diameter of the magnetic adsorbent was 35-55μm and the mass fraction of Fe3O4 in the FADA was about 18%. The isotherm adsorption data agreed with the Langmuir model and the maximum adsorption capacity of Hg^2＋ , Cu^2＋ and Ni^2＋ were 2.3, 2.2 and 1.1 mmol/g respectively. The adsorption rate constants of Hg^2＋, Cu^2＋ and Ni^2＋ determined by Lagergrent equation were 0.023, 0. 034 and 0. 036 min^-1 respectively. And the regeneration and reuse performance of FAD was satisfactory.