PEI功能化的磁性四氧化三铁纳米粒子高效吸附水中刚果红

Efficient removal of Congo red from aqueous solution by PEI-modified Fe_3O_4 magnetic nanoparticle

通过水热法制备了枝状聚乙烯亚胺(PEI)修饰的Fe_3O_4纳米粒子,并借助傅立叶转换红外光谱(FT-IR)、X射线衍射(XRD)、扫描电子显示镜(SEM)和透射电子显示镜(TEM)对该材料进行表征,同时考察了PEI-Fe_3O_4纳米粒子对水中刚果红的吸附性能。结果表明,PEI-Fe_3O_4纳米粒子对刚果红的吸附符合准二级动力学方程和Langmuir吸附等温模型,红外光谱分析表明刚果红吸附的主要方式是化学吸附。PEI-Fe_3O_4纳米粒子对刚果红的最大吸附容量为85.47mg/g,优于文献报道的其他磁性吸附材料,可望作为一种优良的吸附剂去除染料废水中刚果红。

The branched polyethyleneimine（PEI）coated iron oxide nanoparticles（PEI-Fe3O4 NPs）were synthesized through a one-pot hydrothermal method.PEI-Fe3O4 NPs were characterized by fourier transform infrared spectrometer（FT-IR）,X-ray diffraction（XRD）,scanning electron microscopy（SEM）and transmission electron microscopy（TEM）.And it was applied to the adsorption of anionic dye from aqueous solution.The results showed that the adsorption kinetic data were best described by pseudo-second-order kinetic model and the Langmuir isotherm model for the adsorption of Congo red on the PEI-Fe3O4 NPs.Furthermore,the FT-IR spectra result suggested that the main adsorption mode was chemical adsorption between PEI-Fe3O4 NPs and CR.The maximum adsorption capacity for Congo red was 85.47mg/g,which was much higher than the reported values of many other magnetic materials.PEI-Fe3O4 NPs can potentially be used as a suitable adsorbent to remove Congo red from dye wastewater.