磁性功能改性杯[4]芳烃胺肟衍生物及其对铀的吸附特性

以氨基化改性磁性纳米Fe_3O_4粒子为载体,将杯4]芳烃胺肟衍生物进行磁性功能化改性,制备得到立体构象稳定、与UO_2~(2+)空间配位构型匹配的杯4]芳烃胺肟衍生物磁性功能材料(MFM-AOCA)。并采用红外光谱、扫描电镜进行了结构表征。考察了溶液pH值、铀初始浓度、MFM-AOCA用量和吸附时间等因素对吸附的影响。结果表明:杯4]芳烃胺肟衍生物磁性功能修饰后,具有较大的比表面积,其吸附铀的最佳条件是pH值为3.5、铀初始浓度为40 mg/L、吸附剂用量为40 mg和吸附时间为3.5 h。吸附动力学模型和吸附等温模型研究表明,MFM-AOCA对铀的吸附动力学过程符合准二级动力学模型,所得到的相关系数大于0.99;吸附等温线符合Langmuir等温线模型,其最大理论吸附量为141.28 mg/g。使用3种不同的解吸剂对MFM-AOCA解吸再生6次后,其对铀的吸附率均在80%以上,说明该MFMAOCA具有良好的再生性能。

Magnetic Functionalized Modified Amine Oxime Derivative of Calix[4] Arene and Its Adsorption Property for Uranium

Using amino modified magnetic Fe3O4 nanoparticles as carrier, a novel magnetic functionalization material (MFM-AOCA) with very stable three-dimensional conformation and matching with UO2+2 space configuration was obtained through magnetic functionalized modified amine oxime derivatives of calix4] arene.The structure of MFM-AOCA was characterized by FT-IR and SEM.The effects of pH, initial concentration of uranium, MFM-AOCA dosage and adsorption time on the adsorption of uranium on MFM-AOCA were investigated.The results show that the amine oxime derivatives of calix4] arene is magnetic functionalized modified successfully, and it has a large specific surface area.The best condition for the adsorption of uranium on MFM-AOCA is that pH=3.5, the initial concentration of uranium is 40 mg/L, the MFM-AOCA dosage is 40 mg and the adsorption time is 3.5 h.The adsorption kinetic model and isotherm model of MFM-AOCA were studied.The kinetic model of MFM-AOCA can be described by the pseudo-second-order model well, and its correlation coefficient is above 0.99.The isotherm model is fitted to Langmuir adsorption model, and the maximal theoretical adsorption capacity is 141.28 mg/g.In addition, MFM-AOCA has good regeneration performance, because the adsorption rate is over 80% after regenerated 6 times with 3 different desorption agents.