褐煤与石莼共热解制备活性炭及其吸附性能  

Adsorption Properties of Activated Carbon Prepared from Co-pyrolysis of Lignite and Ulva

作　　者：刘靖 何选明[2] 冯东征 柯萍 LIU Jing;HE Xuanming;FENG Dongzheng;KE Ping(Green and Intelligent Coal Chemical Engineering Techology Research Center of Wuhan University of Science and Technology,430081 Wuhan,China;School of Chemistry and Chemical Engineering,Wuhan University of Science and Technology,430081 Wuhan,China)

机构地区：[1]武汉科技大学绿色与智能煤化工工程技术研究中心 [2]武汉科技大学化学与化工学院

出　　处：《煤炭转化》2019年第2期18-24,共7页Coal Conversion

基　　金：国家自然科学基金资助项目(51706160)

摘　　要：将褐煤与石莼的混合物进行低温共热解,再将三相产物中的半焦通过KOH活化制备高性能活性炭材料,并探究活化工艺对活性炭吸附性能的影响。结果表明:褐煤中掺混质量分数为30%的石莼,为共热解最佳掺混比,并可共热解得到半焦。最佳工艺条件为:碱炭质量比3.0∶1、活化时间60min、活化温度800℃,此条件下活性炭的碘吸附值和亚甲基蓝吸附值均达到最大值,分别为1 701.64mg/g和699.61mg/g,吸附性能最优。活性炭的BET比表面积高达1 519.318 3m^2/g,微孔比表面积为1 240.491 3m^2/g,微孔结构发达,微孔孔径主要集中在0.4nm～1.2nm。FTIR检测结果表明,活性炭的表面官能团减少,—OH含量较高。SEM分析结果表明,活性炭表面十分粗糙,存在大量孔结构。Indonesia lignite was co-pyrolyzed with different mass fractions of Ningde ulva,and semi-coke of the pyrolysis products was activated by KOH to prepare the activated carbon.The effects of conditions of KOH activation on the adsorption properties of activated carbon were investigated.Semi-coke was prepared on the condition that the mass fraction of ulva is 30%.The iodine adsorption value and methylene blue adsorption value of activated carbon is up to 1701.64mg/g and 699.61 mg/g respectively when the semi-coke activated by KOH under the optimal conditions of mass ratio of KOH to semi-coke 3.0∶1,activation temperature 800℃,activation time 60 min.BET surface area and micropore surface area is up to 1 519.318 3 m^2/g and 1240.4913m^2/g respectively.Activated carbon’s microporous structure is rich,and its majority of micropore diameter is 0.4 nm-1.2 nm.The FTIR results show that the surface functional group of activated carbon decreases,and the content of-OH is high.The SEM results show that the surface of activated carbon is very rough and has plenty of pore structures.

关 键 词：KOH活化 褐煤 活性炭 共热解 吸附性能 

分 类 号：TQ424[化学工程] TK6[动力工程及工程热物理—生物能]