磁性MOFs复合材料(Fe_3O_4@HKUST-1)的制备及其对U(Ⅵ)的吸附研究

Fabrication of Fe_3O_4@HKUST-1 Composite for U(Ⅵ)Removal

以Fe_3O_4磁性纳米粒子、Cu(NO3)2·3H2O和均苯三甲酸为主要原料合成了一种新型磁性MOFs复合材料-Fe_3O_4@HKUST-1,对其进行XPS、SEM、XRD以及FT-IR表征分析,结果显示该复合材料形貌结构是以Fe_3O_4磁性纳米粒子为核,HKUST-1将其包裹在内.以Fe_3O_4@HKUST-1作为吸附剂,研究不同环境条件下(pH、浓度和吸附时间)对铀的吸附影响.在pH为4的条件下,铀在Fe_3O_4@HKUST-1上有较高的吸附量.Fe_3O_4@HKUST-1对U(Ⅵ)的吸附符合二级动力学模型以及Langmuir等温吸附模型.研究结果表明,Fe_3O_4@HKUST-1对水中U(Ⅵ)有着良好的吸附能力,可作为一种高效的铀吸附材料.

A novel ternary magnetic composite consisting of Cu(NO3)2·3 H2 O,trimesic acid and Fe3O4 nanoparticles(Fe3O4@HKUST-1)were synthesized and characterized.The results show that the composite morphology is based on Fe3O4 magnetic nanoparticles,which is encapsulated by HKUST-1.The Fe3O4@HKUST-1 was applied as a magnetic sorbent for the U(Ⅵ)removal from aqueous solutions.The sorption capacity toward U(Ⅵ)from aqueous solution was conducted by batch experiments.The sorption of U(Ⅵ)by Fe3O4@HKUST-1 fitted well with the pseudo second-order kinetic model and the Langmuir isotherm sorption model.The results show that Fe3O4@HKUST-1 has good sorption capacity for U(Ⅵ)in wastewater,and can be used as a new type of high-efficiency sorption material.