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

中图分类号：X783       文献标志码：A

文章编号：1008-5548(2015)03-0033-05

DOI:10.13732/j.issn.1008-5548.2015.03.008

收稿日期：2014-07-25， 修回日期：2014-08-13，在线出版时间：2015-06-24。

基金项目：四川省教育厅重点科研项目，编号：14ZA0092。

第一作者简介：黎先发（1969—），男，博士，副研究员，研究方向为生物质化学衍生物及生物质洁净能源。 电话： 13981191296， E-mail ：lixianfa@swust.edu.cn。