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- 2019
Fe3O4@离子印迹聚(St-HPMA-DVB)复合材料的合成及其对水中高氯酸盐选择性吸附
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Abstract:
采用超声协助悬浮聚合法以高氯酸根（ClO4-）为模板制备了Fe3O4@离子印迹聚（苯乙烯-3-（2-氨基三乙基四胺）-2-甲基丙烯酸羟丙酯-二乙烯苯）（Fe3O4@ⅡP（St-HPMA-DVB））磁性复合材料，通过TEM、振动样品磁强计（VSM）、TGA、XRD、元素分析（EA）、FTIR等对其进行表征，考察了交联剂DVB用量对材料结构与性能的影响。结果表明：合成的Fe3O4@ⅡP（St-HPMA-DVB）磁性复合材料平均粒径为500~2 000 nm，随DVB用量的增加而增大；磁化强度为9.77~12.78 emu/g，随DVB用量的增加而减小；DVB的加入有利于Fe3O4@ⅡP（St-HPMA-DVB）磁性复合材料的离子印迹空腔的形成和稳定。考察了不同溶液pH值、ClO4-的初始浓度、吸附时间等条件下Fe3O4@ⅡP（St-HPMA-DVB）吸附水中ClO4-的性能，发现溶液pH值能显著影响Fe3O4@ⅡP（St-HPMA-DVB）磁性复合材料对ClO4-的吸附效果，pH为3.0时效果最佳；不同DVB用量Fe3O4@ⅡP（St-HPMA-DVB）磁性复合材料对ClO4-的吸附量和选择性有影响，当DVB用量为0.5 g时，Fe3O4@ⅡP（St-HPMA-DVB）磁性复合材料的吸附量和选择性最佳；吸附机制以离子交换和静电引力为主。等温吸附线符合Langmuir模型，Fe3O4@ⅡP（St-HPMA-DVB）磁性复合材料的饱和吸附量（qm，c=76.9~111.1 mg/g）高于非离子印迹材料Fe3O4@非离子印迹聚（NIP）（St-HPMA-DVB）磁性复合材料（qm，c=62.5 mg/g）。吸附过程可在10 min内达到平衡，符合准二级动力学模型；Fe3O4@ⅡP（St-HPMA-DVB）磁性复合材料能高选择性地有效吸附水中ClO4-，对ClO4-的印迹因子α为1.8，对几种常见共存离子的选择性因子β>5.8，是潜在的高选择性吸附和回收ClO4-的功能材料。 A Fe3O4@ion imprinted poly(Styrene-3-(2-amino triethylenetetramine)-2-hydroxypropyl methacrylate-divinylbenzene) (Fe3O4@ⅡP(St-HPMA-DVB)) magnetic composite was synthesized via ultrasonic assisted suspension polymerization with perchlorate (ClO4-) as the ion imprinting template. The Fe3O4@ⅡP(St-HPMA-DVB) magnetic composite was characterized by TEM, vibrating sample magnetometer (VSM), TGA, XRD, elemental analysis (EA). The effect of the usage amount of crosslinking agent DVB while preparation on the structure and performance of Fe3O4@ⅡP(St-HPMA-DVB) magnetic composite was investigated. The results show that the Fe3O4@ⅡP(St-HPMA-DVB) magnetic composite has an average size of 500-2 000 nm, which increases with the increase of the amount of DVB. The saturation magnetization intensity is 9.77-12.78 emu/g, which decreases with the increase of the amount of DVB. The addition of DVB is beneficial to the formation and stability of the ion imprinted cavity of Fe3O4@ⅡP(St-HPMA-DVB) magnetic composite. The effects of solution pH value, initial concentration of ClO4-, and adsorption time on the adsorption properties of ClO4- in aqueous solutions were investigated. The results show that the adsorption capability is affected significantly by solution pH value and reaches the maximum at pH=3.0. The best adsorption capacity and selectivity of Fe3O4@ⅡP(St-HPMA-DVB) magnetic composite to ClO4- can be obtained when the usage amount of DVB is 0.5 g for synthesis. The adsorption mechanisms may be including both ion exchange and electrostatic interaction. The isothermal adsorption curves mainly obey the Langmuir mode with the maximum adsorption capacity (qm, c=76.9-111.1 mg/g) much higher than that of none-ion imprinted polymer magnetic material
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