不同种类酸改性椰壳活性炭吸附分离CO_2和CH_4  

Adsorption and Separation of CO_2 and CH_4 on Coconut Shell Activated Carbons Modified by Different Acids

作　　者：宋雪[1] 倪诸希 王里奥[1,2] 詹欣源 曾韵敏 李一夫 SONG Xue;NI Zhuxi;WANG Li＇ ao;ZHAN Xinyuan;ZENG Yunmin;LI Yifu(College of Resource and Environmental Science,Chongqing University,Chongqing 400044,China;State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学资源及环境科学学院,重庆400044 [2]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400044

出　　处：《环境科学与技术》2018年第7期84-90,共7页Environmental Science & Technology

基　　金：国家科技支撑计划项目(2014BAC29B01)

摘　　要：与采用碱改性活性炭的方法相比,关于酸改性的研究相对较少,尤其是采用有机酸改性活性炭用于吸附分离CO_2/CH_4中的研究鲜见报道。采用不同种类酸(包括无机酸和有机酸)对活性炭进行改性,利用N_2吸附解吸曲线、FT-IR、SEM、XRD对改性前后活性炭物理化学特性进行表征,同时测定了25℃时活性炭对CO_2和CH_4的等温吸附线。结果表明,酸改性后活性炭比表面积、孔体积等发生不同的变化,但改性后的微孔分布相对集中且出现孔径较小的微孔;有机酸改性活性炭对CO_2的吸附能力和对CO_2/CH_4的分离效果整体比无机酸好,其中以醋酸改性为最优;CO_2以物理吸附的方式被吸附在酸改性活性炭上,再生效果较好;采用有机酸对活性炭进行改性并用于吸附分离CO_2/CH_4是可行的。Compared with the modification of activated carbon by alkalis in separation of CO2/CH4,fewer studies on treatments by acids have been reported,especially by organic acids.Several different acids were utilized to modify the activated carbon.N2adsorption/desorption isotherms,FT-IR,SEM and XRD were adopted to describe the properties of the samples.Adsorption isotherms of CO2and CH4on the raw and the modified samples were measured at 25℃.The results showed that the specific surface area and pore volume varied and the micropore distributed intensively after the modification.The adsorption capacity of CO2and separation effect of CO2/CH4on organic acids modified activated carbons were better than that on inorganic acids modified samples,especially on the sample modified by acetic acid.Adsorption of CO2on acids modified activated carbons was physisorption and could be desorbed easily.The modification of activated carbon by acids could be a feasible method to be used in adsorption and separation of CO2/CH4mixture.

关 键 词：活性炭 不同酸改性 CO2/CH4 吸附 分离 

分 类 号：X701.7[环境科学与工程—环境工程]