K_2CO_3活化制备淀粉基碳分子筛

以可溶性淀粉为碳源、三嵌段共聚物F127为模板剂和K_2CO_3为活化剂,采用一步合成法制备系列淀粉基碳分子筛。通过扫描电子显微镜和N_2吸附-脱附分析淀粉基碳分子筛孔隙形貌和孔结构,采用热重-TG和傅里叶红外光谱表征原料和样品的物质结构官能团。结果表明,K_2CO_3浓度、F127添加比例、反应时间和反应温度影响淀粉基碳分子筛的孔隙结构。在炭化温度800℃、K_2CO_3浓度为0.50 mol·L~(-1)、F127与淀粉质量比=1∶3、反应温度50℃和反应时间12 h条件下制备的淀粉基碳分子筛,孔径集中于0.63 nm,比表面积为1 069.290 4 m~2·g~(-1),单点孔容0.667 901 cm~3·g~(-1)。

Starch-based carbon molecular sieve activated by K2CO3

Using soluble starch as carbon source,block copolymer F127 as a template and K₂CO₃ as chemical activation agent,a series of starch-based carbon molecular sieves was prepared by one-step synthesis method.The pore morphology and pore structure of carbon molecular sieves were analyzed by scanning electron microscope and N₂-adsorption desorption.Raw materials and the samples were characterized by TG-DTG and FT-IR.The influence factors of carbon molecular sieve were investigated.The results showed that K₂CO₃ concentration,F127 addition ratio,reaction time and reaction temperature had influence on pore structure of starch-based carbon molecular sieves.The starch-based carbon molecular sieve,which was prepared under the condition of carbonization temperature 800 ℃,K₂CO₃ concentration 0.50 mol·L^-1,mass ratio of F127 to starch 1∶3,reation temperature 50 ℃ and reaction time 12 h,had more concentrated pore distribution.Aperture concentrated in 0.63 nm,the total pore surface area of BET and a single point of pore volume were 1 069.290 4 m²·g^-1 and 0.667 901 cm³·g^-1,respectively.