Fe_(3)O_(4)@MIL-125制备及其对亚甲基蓝的吸附研究

Fe_3O_4@MIL-125 Preparation and Adsorption of Methylene Blue

本论文主要是探究MOFs材料Fe_(3)O_(4)@MIL-125在不同的影响因素下对染料废水中亚甲基蓝的吸附率。用水热法制备出Fe_(3)O_(4)@MIL-125磁性粒子,使用扫描电镜、能谱、红外光谱对材料Fe_(3)O_(4)@MIL-125表征。实验研究在不同的初始浓度、投加量、震荡时间及不同的pH条件下材料吸附水中亚甲基蓝(MB)的效果。实验测出Fe_(3)O_(4)@MIL-125粒子对亚甲基蓝吸附率,材料投加量60 mg,溶液的初始浓度10 mg/L,震荡时间60 min,溶液pH为7,测得材料的吸附量为5.50 mg/g,吸附率最佳为82.51%,材料的重复利用次数为6次。通过材料吸附热力学和动力学来研究吸附性能,经过试验数据分析可得Fe_(3)O_(4)@MIL-125粒子对亚甲基蓝吸附属于放热反应,符合一级动力学模型属于物理吸附,吸附分子之间不会存在相互作用,吸附表面上的简单单元发生层吸附。

This paper's goal is that study the best condition of MOFs material Fe_3O_4@MIL-125 adsorbs the methylene blue in the wastewater.First,the magnetic nanoparticles Fe_3O_(4) were synthesized,and then MIL-125 was synthesized on the surface.The material Fe_3O_4@MIL-125 was characterized by SEM,EDS and IR.It was proved that MIL-125 was attached to the surface of magnetic nanoparticles Fe_3O_4.The research has studied the materials'adsorption on methylene blue under different initial concentration,dosage,oscillation time and pH conditions.The results showed that the best experimental conditions for the adsorption of methylene blue by Fe_3O_4@MIL-125 which include material's adding is 60 mg,solution's initial concentration is 10 mg/L,shaking time is 60 min,solution's pH is 7.The material's adsorption capacity is 5.50 mg/g,the best adsorption rate is 82.51%,and the material can repeated use 6 times.The adsorption performance is studied through material adsorption thermodynamics and kinetics.After the analysis of experimental data,it can be found that the adsorption of Fe_3O_4@MIL-125 particles to methylene blue is an exothermic reaction,and it is in accordance with the first-order kinetic model and belongs to physical adsorption,and there will be no adsorption molecules.Interaction,adsorption of simple units on the surface,only layer adsorption occurs.