纳米Fe_3O_4表面聚合磁微粒对芴和荧蒽的吸附性能研究

Adsorption performance of fluorene and fluoranthene on the surface polymeric Fe_3O_4 magnetic nanoparticles

以表面聚合法制备纳米Fe_3O_4表面聚合磁微粒,研究纳米Fe_3O_4表面聚合磁微粒对芴和荧蒽的吸附热力学和动力学特性.结果表明,纳米Fe_3O_4表面聚合磁微粒对芴和荧蒽等温吸附过程符合准二级动力学方程.在5 22 mg/L浓度范围内,纳米Fe_3O_4表面聚合磁微粒对芴和荧蒽的吸附行为符合Langmuir等温方程,30 60℃温度范围内,吸附自由能ΔG<0,吸附焓变ΔH>0,吸附熵变ΔS>0,表明吸附是一个自发的、吸热的熵增过程.

Fe_3O_4magnetic nanoparticles were prepared by surface polymerization techniques. The adsorption thermodynamics and kinetics of fluorene and fluoranthene on Fe_3O_4 magnetic particles were investigated. It was indicated that the isotherm adsorption was consistent with pseudo-second order kinetics model. Within 5—22 mg / L concentration range,the adsorption behavior of fluorene and fluoranthene on Fe_3O_4 magnetic particles was consistent with the Langmuir isotherm model. Moreover,when ΔG < 0,ΔH > 0,ΔS > 0,range from 303. 15 K to 333. 15 K,it was suggested that the adsorption was a spontaneous endothermic and entropy increasing process.