以线性酚醛树脂为炭前驱体制备有序介孔炭及其表征

Preparation and characterization of ordered mesoporous carbon by using novalac phenolic resin as carbon precursor

以三嵌段共聚物F127和P123为模板剂,线性酚醛树脂(PF)为炭前驱体,利用有机-有机自组装制备了具有二维六方结构和蠕虫结构的介孔炭。采用XRD、TEM、N2吸附/脱附等方法对介孔炭的结构进行了表征,研究了模板剂用量和模板剂类型对上述介孔炭结构的影响。结果表明:当模板剂F127与PF的质量比由1∶2变为1∶1时,所得介孔炭的孔壁厚度有所下降,但比表面积、孔容和孔径分别从576 m2·g-1、0.29 cm3·g-1和2.7 nm提高到670 m2·g-1、0.40 cm3·g-1和3.2 nm;分别以F127和P123为模板剂制备的介孔炭F-1-500和P-1-500的孔径大小基本相同,但P-1-500的孔壁厚度相对于F-1-500降低了37.4%,且有序性下降,仅能得到蠕虫状结构。

Ordered mesoporous carbon frameworks with two-dimensional hexagonal structure have been synthesized through solvent evaporation induced organic-organic self-assembly method （EISA）, by using triblock copolymer F127 or P123 as the template and novalac phenolic resin as the carbon precursor. The structures of ordered mesoporous carbons were characterized by X-ray diffraction, transmission electron microscopy and N2 adsorption/desorption measurements. The effects of template content and different templates on the pore structures of ordered mesoporous carbons were investigated. The results showed that, when the mass ratio of F127 to novalac phenolic resin was increased from 0.33 to 0.5, the regularity and wall thickness of ordered mesoporous carbon decreased, but the surface area, pore volume and pore size increased from 576 m2·g-1, 0.29 cm3·g-1 and 2.7 nm to 670 m2· g-l, 0.40 cm3·g-1 and 3.2 nm, respectively. Two kinds of ordered mesoporous materials F-1-500 and P-1-500 prepared by using F127 and P123 as templates respectively appeared the same pore size, but the wall thickness of F-l-500 was 3.3 nm, and that of P-1- 500 reduced 37.4%, compared to F-1-500.