摘要：以造纸黑液回收的碱木质素为前驱体,经磷酸活化制备低成本的木质素活性炭,对活性炭进行比表面积、孔结构及形貌的表征;考察活化温度、磷酸与碱木质素浸渍比、活化时间以及N₂流量对活性炭产率及孔结构的影响。结果表明:磷酸活化碱木质素制备活性炭的产率都大于60%;在活化温度为550℃,磷酸与木质素浸渍比为1.5,活化时间3 h以及N₂体积流量为75 mL/min时,活性炭比表面积达到1 139 m²/g;低成本的碱木质素是制备低成本活性炭的潜在的前驱体材料。

关键词：碱木质素；化学活化；活性炭；孔结构

Abstract： Utilizing Kraft lignin recovered from papermaking black liquor as the precursor, low cost activated carbon was prepared by H₃PO₄activation. The activated carbons was characterized in terms of the BET surface area, pore volumes and surface morphology. The effect of activation temperature, impregnation ratio of H₃PO₄ to Kraft lignin, activation time and N₂ flow rate on the activated carbon yield and pore structure was investigated. The results show that the yields of all activated carbon are larger than 60% due to the high carbonaceous content of Kraft lignin. The maximum surface area of the activated carbon is 1 139 m²/g produced at the activation temperature of 550 ℃ , impregnation ratio of H₃PO₄ to Kraft lignin of 1.5, activation time of 3 h and N₂ volume flow rate of 75 mL/min. The low cost Kraft lignin is a potential precursor material in the preparation of low cost activated carbon. 

Keywords: Kraft lignin； chemical activation； activated carbon； pore structure