通过变动Fe、C的摩尔比,利用非共价的方式,借助于表面活性剂十二烷基硫酸钠(SDS)将Fe3O4磁性纳米粒子定量地修饰到多壁碳纳米管(MWNTs)的表面,制备出MWNTs/SDS/Fe3O4纳米复合材料.结果表明,随着Fe、C摩尔比中Fe的百分含量升高,磁性复合材料的饱和磁化强度相应增大,所以可以通过改变铁碳比来制备磁性可控的纳米磁性复合材料.另外,MWNTs/SDS/Fe3O4纳米复合材料的吸附实验表明,对亚甲基蓝染料溶液有较高的吸附效率,作为一种磁性材料,利用永磁体,可以轻易地将吸附完成后的纳米复合材料从染料溶液中分离出来,重新收集后循环利用.%A magnetic composite of multi-walled carbon nanotubes (MWNTs) decorated with iron oxide nanoparticles (NPs) quantificationally was synthesized successfully by a simple and effective chemistry precipitation method using sodium dodecyl sulfate (SDS) with the molar ratio of Fe and C. The MWNTs/ SDS/Fe3O4 nanocomposite was characterized by XRD, TEM, and VSM techniques, the saturated magnetization of the resulted magnetic nanocomposite increased correspondingly. Therefore, it could be learned that magnetic property of the nanocomposites could be controlled by varying the ratio of Fe/C. The MWNTs/SDS/Fe3O4 nanocomposites were employed as a new adsorbent for dye removal. The adsorption results showed that adsorption efficiency of MWNTs/SDS/Fe3O4 nanocomposites was high for methylene blue. As a magnetic material, it could be separated easily from aqueous solution by an external magnet, collected and used repeatedly.
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