磁性碳纳米管复合材料的制备及其吸附性能研究

Synthesis and Adsorption Properties of Magnetic Carbon Nanotubes Composites

文章以碳纳米管为基质负载磁性介质铁酸钴,再用十六烷基三甲氧基硅烷(C_(16))修饰合成了磁性纳米复合材料(CNTs@CoFe_2O_4-C_(16))。运用SEM、TEM、VSM、FTIR等技术对材料进行表征以确定合成材料的表面结构、功能基团和磁性特点等。采用批处理实验模式,考察不同的操作条件对复合材料吸附性能的影响,并用吸附等温线和吸附动力学模型模拟吸附过程。结果表明,磁性碳纳米管复合材料对孔雀石绿和甲基蓝有较好的吸附效果,在优化的实验条件下最大去除率分别为99.7%和84.8%。此外,CNTs@CoFe_2O_4-C_(16)的吸附过程符合Freundlich方程,动力学过程更符合准二级动力学方程。

The magnetic composites(CNTs@CoFe2 O4-C16) were synthesized by using carbon nanotubes as the matrix and cobalt ferrite as the magnetic medium and hexadecyltrimethoxysilane(C16) as the decoration. The resulting CNTs@CoFe2 O4-C16 was characterized by SEM, TEM, VSM and FTIR to determine the surface structure, functional groups and magnetic property of the composites. The effects of different operating conditions such as initial dye concentration, solution pH, contact time, ionic strength on the adsorption of the composites were investigated by batch experiment model. Moreover, the adsorption process was fitted by different adsorption isotherms and kinetic models. The results showed that the removal efficiency of nanomaterials for malachite green and methyl blue was 99.7% and 84.8%, respectively. In addition, the adsorption process of CNTs@CoFe2 O4-C16 was in good agreement with the Freundlich equation, and the kinetic process was well described by the pseudo-second order equation.