摘要
采用绿色、温和的方法合成了一种新型的磁性纳米复合材料(Fe3O4@PDA@RGO),并考察了其对水溶液中亚甲基蓝的吸附去除效果。多巴胺通过自聚合作用可以直接吸附到Fe3O4表面,其既是氧化石墨烯(GO)的还原剂,也是Fe3O4和还原态氧化石墨烯(RGO)组装的偶联剂。反应过程中无需热处理或加入其他有机试剂。利用透射电子显微镜(TEM)、红外光谱(FTIR)、X衍射光谱(XRD)和拉曼光谱等技术对制备的磁性纳米复合材料进行了表征。结果表明,Fe3O4@PDA@RGO具有较强的磁性(37.8 emu·g-1),对亚甲基蓝有较高的吸附去除能力(98 mg·g-1)。Fe3O4@PDA@RGO对亚甲基蓝的吸附能力随着p H值的增大而增强,其吸附过程符合拟二级反应动力学方程和Langmuir吸附模型。Fe3O4@PDA@RGO作为吸附剂,其性质稳定,经磁性分离可重复利用10次以上。
A facile and low-toxicity approach was proposed to synthesize a new magnetic adsorbent（ Fe3O4@ PDA@ RGO） to remove methylene blue（ MB） in water samples. Dopamine could directly adhere to Fe3O4 by one-step self-polymerization reaction,which serves as a reducing agent as well as a coupling agent for the assembly of reduced graphene oxide（ RGO）. The synthetic progress involves no additional chemicals and thermal treatments. Transmission electron microscope（ TEM）,Fourier transform infrared spectroscopy（ FTIR）,X-ray diffraction（ XRD） and Raman spectroscopy were used to characterize the magnetic composite nanoparticles. The results demonstrated that Fe3O4@ PDA@RGO has a strong magnetism（ 37. 8 emu·g^- 1） and exhibits a high adsorption capacity to MB（ 98 mg·g^- 1）. The adsorption of MB on Fe3O4@ PDA@ RGO is p H-dependent and favorable in basic solution. The adsorption behavior of MB on Fe3O4@ PDA@ RGO could be described by the pseudo-second-order kinetics model and Langmuir isotherm. Furthermore, the as-prepared adsorbent can be easily recovered and reused at least ten times due to its high magnetization and stability.
出处
《分析测试学报》
CAS
CSCD
北大核心
2015年第2期127-133,共7页
Journal of Instrumental Analysis
基金
国家973项目(2014CB441102)
环保部公益项目(201409037)
国家自然科学基金面上项目(21277002)
