酸化时间对磁性碳纳米管制备及吸附菲的影响

Effect of acidification time on preparation of magnetic multi-walled carbon nanotubes and adsorption of phenanthrene in Water

采用共沉淀法对混酸氧化的多壁碳纳米管(MWCNTs)进行磁化,形成了Fe_3O_4/MWCNTs磁性复合材料(MMWCNTs).研究了酸化时间对MMWCNTs制备及其吸附水中菲性能的影响.结果表明:弱酸条件下吸附效果较好,MMWCNTs对水中菲的吸附在30min内快速上升,到60min时基本达到平衡,吸附过程符合准二级动力学模型.MMWCNTs对水中菲的饱和吸附量随酸化时间增加呈现先升高后降低的趋势.酸化7h后制备的MMWCNTs的饱和吸附量最大,达到17.56μg/mg.

The multi-walled carbon nanotubes oxidized by mixed acids were magnetized by the co-precipitation method to form a kind of magnetic composite material of ferroferric oxide/multi-wall carbon nanotubes (MMWCNTs). The effects of acidification time on the preparation of MMWCNTs and their adsorption properties for phenanthrene in water were investigated. Experimental results indicated that the adsorption of phenanthrene was better under weak acid conditions.The adsorption of phenanthrene on MMWCNTs processed quickly within 30 minutes, and basically reached equilibrium at 60 minutes. The regression results showed that the adsorption kinetics were more accurately represented by the pseudo second-order model. The saturation adsorption capacity of phenanthrene on MMWCNTs represented a trend of increasing first and then decreasing with increasing acidification time. The maximal saturation adsorption capacity of phenanthrene on MMWCNTs was 17.56μg/mg based on MWCNTs after 7h acidification.