磁性多壁碳纳米管的制备及其在重金属水处理方面的应用

Preparation of Magnetic Multi-walled Carbon Nanotubes and Its Application in Heavy Metal Water Treatment

利用湿化学氧化法对多壁碳纳米管(MWCNT)进行表面功能改性处理,然后采用溶剂热法进一步处理制备重金属吸附性能的磁性多壁碳纳米管(60-MWCNT/Fe304),并采用SEM、FT-IR、XPS等表征。结果表明:经磁性四氧化三铁表面改性后,在MWCNT表面有效引入了含氧官能团(一COOH)及磁性Fe—0基团,制备的60-MWCNT/Fe304集合了MWCNT材料的优良特性及Fe304磁性材料的磁特性。在此基础上,将60-MWCNT/Fe304作为可靠的吸附剂用于重金属水处理。实验结果表明60-MWCNT/Fe304对Cu(Ⅱ)、Cd(Ⅱ)及Pb(Ⅱ)具有良好的吸附分离效果,最佳吸附pH值为6,最大饱和吸附容量分别达到87.64、57.14、215.05 mg·g-1且对共存离子具有选择性。吸附动力学曲线拟合发现,符合Langmuir吸附等温模型和拟二级动力学吸附模型。这项研究为吸附法处理水体中重金属离子提供了新的思路。

Surface modification of multi-walled carbon nanotubes(MWCNTs)by wet chemical oxidation,then,further processing by solvothermal method to prepare magnetic multi-walled carbon nanotubes(60-MWCNT/Fe304)with excellent heavy metal adsorption performance.SEM,FT-IR,XPS and other characterization results show that the surface of MWCNT modified with magnetic ferric oxide surface has effectively introduced oxygen-containing functional groups(-COOH and magnetic Fe-O groups).The prepared 60-MWCNT/Fe304 combines the excellent characteristics of MWCNT materials and the magnetic characteristics of Fe304 magnetic materials.On this basis,60-MWCNT/Fe304 is used as a reliable adsorbent for heavy metal water treatment.Experimental results point out that 60-MWCNT/Fe304 has a good adsorption and separation effect on Cu(II),Cd(II)and Pb(II),The optimum adsorption pH is 6,and the maximum saturated adsorption capacity is 87.64,57.14,215.05 mg?g1.At the same time,we also found that the material is selective for coexisting ions.By fitting the adsorption kinetics curve,it was found that the material conforms to the Langmuir adsorption isotherm model and the pseudo-second-order kinetic adsorption model.This study provides a new thinking for the treatment of heavy metal ions in water bodies by adsorption.