低温预处理磷酸法制备活性炭  

Preparation of activated carbon by phosphoric acid through low temperature pretreatment

作　　者：吴开金[1,2] 林冠烽[1,3] 孙康[3] 陈涵[1,2] 陈志强[1] 官新宇[1] 

机构地区：[1]福建省林业科学研究院,福建福州350012 [2]福建省森林培育和林产品加工利用重点实验室,福建福州350012 [3]中国林业科学研究院林产化学工业研究所,江苏南京210042

出　　处：《福建农林大学学报（自然科学版）》2012年第1期99-103,共5页Journal of Fujian Agriculture and Forestry University:Natural Science Edition

基　　金：林业公益性行业专项(201004051);省属公益类科研院所基本科研专项(2011R1013-5);福建省自然科学基金项目(2009J01237)

摘　　要：以磷酸浸渍杉木屑,并在低温下进行预处理,制备活性炭.探讨了预处理温度、活化温度、浸渍比、保温时间和磷酸浓度等因素对活性炭性能的影响.结果表明,低温预处理有利于磷酸在木质原料内部的渗透,促进磷酸的活化作用,提高活性炭的吸附性能;活化温度、保温时间和磷酸浓度对活性炭的吸附性能、比表面积和孔容积具有正向作用;随着浸渍比的增大,活性炭的吸附性能呈先升后降的趋势;N2吸附等温线分析表明,活化温度的升高有利于其比表面积和孔容积的提高.在较佳的实验条件下,活性炭的比表面积、总孔容积和微孔容积分别为1628.7 m2.g-1和0.894、0.699 cm3.g-1.Activated carbons were prepared by phosphoric acid activation from Chinese fir powder which was impregnated by phosphoric acid and pretreated at low temperature.The effect of pretreatment temperature,activation temperature,impregnation ratio,holding time and phosphoric acid concentration on the properties of the activated carbons were studied.The results showed that pretreatment at low temperature promoted the penetration of phosphoric acid into lignocellulose,enhanced the activation of phosphoric acid,and increased the adsorption capability of activated carbon.As the increasing of activation temperature,holding time and phosphoric acid concentration,the adsorption capability,specific surface area and pore volume of activated carbon were increased;with the increasing of impregnation ratio,the adsorption properties of activated carbon increased at a maximum value and then decreased.N2 adsorption isotherms showed that the increasing of activation temperature was benefited for surface area and pore volume.Under optimized experimental condition,the surface area,total pore volume and microporous volume of the samples were 1628.7 m2·g-1,0.894 cm3·g-1 and 0.699 cm3·g-1,respectively.

关 键 词：活性炭 磷酸 低温 预处理 

分 类 号：TQ351.2[化学工程]