摘要
以农林废弃物椰壳、核桃壳、废竹料和玉米芯为原料,磷酸活化法制备一系列生物质活性炭(Y1、H2、Z3、M4),容积法测定其对乙烷的吸附等温线,吸附温度范围为298.15K～243.15K;分别用Langmuir方程和Langmuir-Freundlich方程对吸附平衡数据进行拟合,并计算其等量吸附热。结果表明生物质为原料通常可以制备具有高比表面积和一定中孔比例的活性炭;四种活性炭对于乙烷的吸附量皆随着温度的降低和压力的升高而增大;Langmuir-Freundlich方程拟合效果较Langmuir方程更好;随着乙烷在四种活性炭上的吸附量由0.5mmol/g增加到5mmol/g,其等量吸附热基本呈现逐渐减小的趋势,反应了活性炭表面的不均匀性。
A series of activated carbons(Y1,H2,Z3 and M4)were prepared by phosphoric acid activation method from biomass coconut shell,walnut shell,waste bamboo and corncob,respectively.The adsorption isotherms of ethane on the activated carbons were measured using a volumetric method in the range of 298.15 to 243.15K.Langmuir equation and Langmuir-Freundlich equation were employed to fit the adsorption isotherms of ethane,and the isosteric heats of adsorption were calculated.The results showed that the biomass materials can usually be used to prepare activated carbons with high specific surface area and a certain ratio of mesopore.The amount of adsorption decreased gradually as the temperature increased on four kinds of activated carbon.Langmuir-Freundlich equation was better than Langmuir equation to describe the isotherms.The isosteric heat of adsorption decreased basically as the adsorption capacity of ethane on four activated carbons increased from 0.5mmol/g to 5mmol/g,which reflected the surface heterogeneity of activated carbon.
作者
彭敏
孙艳
苏伟
PENG Min;SUN Yan;SU Wei(School of Sciences,Tianjin University,Tianjin 300350,China;School of Chemical Engineering and Technology,Tianjin University,Tianjin 300350,China)
出处
《天然气化工—C1化学与化工》
CAS
CSCD
北大核心
2018年第6期62-67,共6页
Natural Gas Chemical Industry
基金
国家自然科学基金(21406004)
关键词
生物质活性炭
乙烷
吸附存储
吸附模型
等量吸附热
biomass activated carbons
ethane
adsorption storage
adsorption model
isosteric heat
