制备工艺对淀粉基碳分子筛性能的影响

Influence of fabrication processing on properties of starch-based carbon molecular sieve

以淀粉为碳源,F127为结构导向剂,通过KOH活化一步合成法制备系列碳分子筛,采用SEM、TG、FT-IR和N_2吸附-脱附等技术对原料和碳分子筛样品的结构、表面官能团和性能进行表征。结果表明,温度、F127与淀粉添加质量比和KOH浓度对碳分子筛样品的孔隙结构性能影响显著。在KOH浓度为0.75 mol·L^(-1)、m(F127)∶m(淀粉)=4∶3、搅拌时间12 h和反应温度45℃时制备的碳分子筛孔径分布集中,BET比表面积达1 228.972 5 m^2·g^(-1),单点孔容0.807 113 cm^3·g^(-1),单点微孔体积0.636 869 cm^3·g^(-1)。

Using starch as carbon source,potassium hydroxide as activating agent and F127 as structure directing agent,the carbon molecular sieve with high-surface area was prepared by one-step activation method. The porous structures,surface functional groups and properties of the raw material and the carbon molecular sieve samples were characterized by SEM,TG,FT-IR and N2adsorption-desorption,etc. The results showed that temperature,mass ratio of F127 to starch and KOH concentration had significant influence on the pore structure properties of the carbon molecular sieve. Under the preparation condition of KOH concentration 0. 75 mol·L^-1,m（ F127） ∶ m（ starch） = 4∶ 3,stirring time 12 h and reaction temperature 45 ℃,the obtained carbon molecular sieve with pore size distribution concentration had high BET specific surface area of 1 228. 972 5 m^2·g^-1,and a single point of hole and single micropore volume were 0. 807 113 cm^3·g^-1 and 0. 636 869 cm^3·g^-1,respectively.