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利用分散有不同锰含量的聚丙烯腈(PAN)混合溶液,通过静电纺制备聚合物纤维,然后经过预氧化、碳化和活化工艺对静电纺获得的聚合物纤维进行处理以合成活性碳纳米纤维。活化工艺如下:氮气气氛下,于体积比为30%的蒸汽(800℃)中处理30 min。不含锰或者嵌锰的活性碳纳米纤维的平均直径约为250 nm。从对孔表征的结果可以看出,具有更高比表面积以及更大孔容的活性碳纳米纤维在甲苯的吸附中占据优势,不含锰的样品的甲苯吸附能力为40 g甲苯/100 g活性碳纳米纤维,然而,嵌有0.23%锰的样品的甲苯吸附能力为68 g甲苯/100 g复合碳纳米纤维,其对应的比表面积、微孔容以及平均微孔直径分别为1229 m2/g、0.416 cm3/g和5.8魡。适合于甲苯吸附的微孔特征是由静电纺、锰粒子的添加以及活化工艺进行控制,这是为什么要通过静电纺制备定向排列和锰(用于作为催化反应的催化剂)分散良好的纳米纤维,以及寻求最佳活化条件防止产生中孔的原因。对于活性碳纳米纤维的表面化学性能,所有样品表面的氧/碳比(O/C)是相似的(约为0.1),这表明活性碳纳米纤维表面是非极性的。
The polymer fibers are prepared by electrospinning using a polyacrylonitrile (PAN) mixed solution with different manganese contents dispersed therein, and then the electrospun polymer fibers are treated by a pre-oxidation, carbonization and activation processes to synthesize activated carbon nanofibers. The activation process is as follows: In a nitrogen atmosphere, the volume ratio of 30% steam (800 ℃) for 30 min. Manganese-free or manganese-impregnated activated carbon nanofibers have an average diameter of about 250 nm. As can be seen from the characterization of the pores, activated carbon nanofibers with higher specific surface area and larger pore volume dominate the adsorption of toluene, and the toluene-free adsorption capacity of the manganese-free sample was 40 g toluene / 100 g activity However, the adsorption capacity of toluene with 0.23% Mn was 68 g toluene / 100 g composite carbon nanofibers with corresponding specific surface area, micropore volume and average micropore diameter of 1229 m2 / g, respectively. 0.416 cm3 / g and 5.8 魡. Micropore characteristics suitable for the adsorption of toluene are controlled by electrospinning, the addition of manganese particles and the activation process, which is why well-dispersed nanofibers are prepared by electrospinning aligned and manganese (used as a catalyst for the catalytic reaction) And to find the best activation conditions to prevent the generation of mesopores reasons. For the surface chemical properties of activated carbon nanofibers, the oxygen / carbon ratio (O / C) of all sample surfaces was similar (about 0.1) indicating that the surface of activated carbon nanofibers was non-polar.