非水体系快速挥发法直接合成有序介孔炭

Synthesis of ordered mesoporous carbons by non-aqueous solvent evaporation method

  • 摘要: 采用非水溶剂快速挥发法,以表面活性剂和酚醛树脂为结构导向剂和碳前驱体制备介孔炭。通过透射电镜、氮吸附-脱附和扫描电镜对产品的结构进行了表征。结果表明:所制介孔炭具有高度有序的二维六方结构。表面活性剂与酚醛树脂的配比对介孔炭的有序性有较大的影响,当其质量比高于1∶0.25时,可保持良好的有序度。随着比值的减小,有序度逐渐降低。与蔗糖液相浸渍法相比,非水体系快速挥发法所制介孔炭具有较少的外微及大孔。

     

    Abstract: Ordered mesoporous carbons (OMCs) with well-developed mesopores were synthesized using evaporation-induced self-assembly (EISA). The triblock copolymer P123/phenol-resin/silica composites were prepared by EISA using tetraethyl orthosilicate as the inorganic source, P123 as the structure directing agent and phenol-resin as the carbon source. OMCs were obtained by the carbonization of the composites, followed by the removal of the silica template with a mass fraction 10% HF aqueous solution. For comparison, another OMC was synthesized by using ordered silica as a hard template and impregnated sucrose as the carbon precursor. The samples were characterized by scanning and transmission electron microscopy and N2 sorption. Results indicated that the OMCs had an ordered hexagonal structure with a narrow distribution of mesopores. The optimized OMC was obtained using a P123/phenol-resin mass ratio of 1∶0.25. Compared with the OMCs synthesized by the hard template method, the new OMCs had fewer micro- and macropores.

     

/

返回文章
返回