蒸汽爆破预处理杨木基多孔炭吸附性能的研究

Study on Adsorption Properties of Poplar-based Porous Carbon Prepared by Steam Explosion Pretreatment

中文关键词:  杨木  蒸汽爆破  多孔炭  亚甲基蓝  吸附性能

Key Words:poplar  steam explosion  porous carbon  methylene blue  adsorption performance

中文摘要:

      采用蒸汽爆破技术对杨木进行预处理，以蒸汽爆破前后的杨木为原料制备多孔炭，探究蒸汽爆破对杨木基多孔炭成孔性能的影响。采用N₂吸附-脱附曲线、扫描电子显微镜和傅里叶变换红外光谱仪对制得的多孔炭进行表征。结果表明，以蒸汽爆破后的杨木为原料、添加尿素制备的多孔炭PC_SE-N的比表面积最高，为3002 m²/g，明显高于杨木原料（无蒸汽爆破）多孔炭PC_NP-N（2698 m²/g），且PC_SE-N具有高介孔比表面积（1976 m²/g）。以亚甲基蓝为吸附质，对制得的多孔炭的吸附性能进行评估，发现PC_SE-N对亚甲基蓝的吸附量可达1726 mg/g，吸附过程符合准二级动力学方程和Langmuir模型。

Abstract:

      Steam explosion technology was used to pretreat poplar chips to prepare poplar-based porous carbon； the effect of steam explosion on the properties of the as-prepared porous carbon was studied. N₂ adsorption-desorption， SEM， and FT-IR were used to characterize the porous carbon. The results showed that the PC_SE-N prepared from steam-exploded poplar with adding urea had the highest specific surface area， up to 3002 m²/g， which was higher than that of PC_NP-N （2698 m²/g） prepared from poplar without steam explosion. Moreover， PC_SE-N was of high mesoporous specific surface area （1976 m²/g）. The adsorption properties of the prepared porous carbon were analyzed by using methylene blue as the adsorbent. The adsorption capacity of PC_SE-N towards methylene blue was as high as 1726 mg/g， and the adsorption process conformed to the pseudo-second-order kinetic equation and Langmuir model.