希夫碱改性Fe3O4杂化材料的制备与表征

Preparation and characterization of schiff base modified Fe3O4 hybrid material

摘要:

将制备的Fe3O4@SiO2-NH2磁性杂化材料依次经过丙烯酸甲酯(MA)、乙二胺（EDA）和水杨醛（SA）的接枝，得到希夫碱改性的Fe3O4杂化材料（Fe3O4@SiO2-S2)，并通过IR、XRD、SEM、TEM、VSM对杂化材料的结构进行表征。结果表明，Fe3O4@SiO2-S2材料核壳结构明显，饱和磁化强度为45.9 emu/g。对水溶液中重金属离子的吸附实验结果表明，Fe3O4@SiO2-S2对Hg2+具有选择吸附性，pH=6、45 ℃条件下，饱和吸附量可达到362 mg/g(1.12 mmol/g)，优于Fe3O4@SiO2-NH2、Fe3O4@SiO2-HO-S等吸附剂，且在5次循环使用后吸附性能仍能保持89%，吸附时间约300 min达到吸附平衡，吸附等温线符合Langmuir等温吸附模型。

Abstract:

A Fe3O4 hybrid material (Fe3O4@SiO2-S2) modified by schiff base was prepared by grafting methyl acrylate (MA), ethylenediamine (EDA) and salicylaldehyde (SA) onto the prepared magnetic hybrid material Fe3O4@SiO2-NH2 successively, what's more, the structure was characterized by IR, XRD, SEM ,TEM and VSM. The results showed that the Fe3O4@SiO2-S2 has an abvious core-shell structure and a saturation magnetization of 45.9 emu/g. Study on the adsorption of aqueous heavy metal ions showed that Fe3O4@SiO2-S2 posed selective adsorption for Hg2+ with the saturated adsorption capacity of 362 mg/g(1.12 mmol/g), which was superior to Fe3O4@SiO2-NH2, Fe3O4@SiO2-HO-S and other adsorbents, at the condition of pH=6, 45 ℃, the adsorption capacity remained 89% after 5 cycles of adsorption-desorption, what's more, adsorption equilibrium was reached at about 300 min and the adsorption isotherm conformed to the Langmuir isotherm adsorption model.