北京林业大学学报2018，Vol.40Issue(3)：128-134,7.DOI:10.13332/j.1000-1522.20170431
NaOH预处理制备介孔木糖渣活性炭及其性能
Preparation and properties of mesoporous activated carbons from NaOH-pretreated corncob residues
摘要
Abstract
[ Objective] Compared with common activated carbon, mesoporous activated carbon has the advantages of good hydrophobic, large pore volume and high conductivity, etc. However, the traditional preparation method is complicated and has higher costs for raw materials. Therefore, it is crucial to explore new mesoporous activated carbon preparation method. [ Method ] Activated carbon with high mesoporous rate was prepared from corncob residues by NaOH pretreatment, followed by phosphoric acid activation. The influences of NaOH-pretreated time, ratio of H3 PO4/corncob residues ( impregnation ratio) and activation temperature on MB adsorptive property of the activated carbon were investigated through the single factor experiments. [ Result ] Results indicated that lignin removal from corncob residues by NaOH pretreatment may form pore gallery and swell the fibers, making it easier to contact with activator. As a consequence, activate carbon with high specific surface area and mesoporous rate was obtained. The best MB adsorption value of 436 mg/g was achieved when corncob was pretreated by NaOH for 4 hours under a impregnation ratio of 4:1 , activation temperature at 500℃ and activation time for 1 hour. Scanning electron microscopy ( SEM) analysis showed that the surface of activated carbon was rich in mesopores and macropores. The developed pore structure and specific surface area were analyzed by N2 adsorption tests. The surface area, total pore volume and average pore size of activated carbon were 2038 m2/g, 2. 13 cm3/g and 4. 18 nm, respectively. Particularly, the mesoporous volume was 1. 56 cm3/g and the mesoporous rate was 73. 2％. [ Conclusion] The above mentioned results indicated that appropriate NaOH pretreatment contributes to the preparation of activated carbon with well-developed mesoporous structure, which has potential application in fields of heavy metal ion adsorption, organic macromolecular wastewater treatment and electronic components preparation, etc. Our work will provide a fundamental research for the efficient preparation of mesoporous activated carbon and promote the high-value utilization of the corncob residues.关键词
木糖渣/介孔/活性炭/吸附Key words
corncob residues/mesoporous/activated carbon/adsorption分类
农业科技引用本文复制引用
刘鹏鹏,周素坤,王超,游婷婷,许凤..NaOH预处理制备介孔木糖渣活性炭及其性能[J].北京林业大学学报,2018,40(3):128-134,7.基金项目
教育部中央高校基本科研基金资助项目(2015ZCQ-CL-03). （2015ZCQ-CL-03）
