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制备了表面修饰2,6-二氨基吡啶试剂的新型复合磁性Fe3O4纳米粒子,采用红外光谱对其进行了表征,并以火焰原子吸收光谱法(FAAS)测定其对水中Cu2+和Zn2+等重金属离子的静态吸附性能,考察了溶液pH值、平衡时间、吸附物初始浓度、洗脱条件等对复合材料吸附性能的影响。结果表明,复合材料在pH6—7时可对水中Cu2+和Zn2+产生有效吸附,5min内即可达到吸附平衡,等温吸附数据符合Langmuir单分子层吸附模型,T=298K,pH=7,V=50mL时对两种离子的饱和吸附量分别为45mg.g-1和32mg.g-1,重复使用6次其饱和吸附能力未见明显下降。
A novel composite magnetic Fe3O4 nanoparticle with surface-modified 2,6-diaminopyridine reagent was prepared and characterized by FTIR. FAAS was used to determine its effect on heavy metal ions such as Cu2 + and Zn2 + in water Static adsorption properties were investigated. The effects of pH value, equilibrium time, initial concentration of adsorbent and elution conditions on the adsorption properties of the composites were investigated. The results show that the composite material can effectively adsorb Cu2 + and Zn2 + in water at pH6-7, and the adsorption equilibrium can be achieved within 5 minutes. The isothermal adsorption data conform to the Langmuir monolayer adsorption model with T = 298K, pH = 7 and V = 50mL When the saturated adsorption capacity of the two ions were 45mg.g-1 and 32mg.g-1 respectively, the saturation adsorption capacity of six ions was not significantly decreased after six times of re-use.