摘要
为研究粉末活性炭(PAC)对苯的吸附性能,对比分析两种PAC的物理化学性质.结果表明:煤质炭微孔面积320 m2/g远小于木质炭微孔面积563 m2/g,煤质炭表面基团比木质炭丰富.使用Dubinin和Sper-pinsky(DS)公式对活性炭吸附水分子进行定性分析,表明煤质炭易于吸附水分子,木质炭更易于吸附苯;研究两种炭对苯的吸附等温线,比较Langmuir、Freundlich、Sips、Toth方程描述吸附等温线的准确性,结果表明Toth方程相关性系数最接近1,更适合描述PAC吸附水中苯;木质炭吉布斯自由能变(-ΔG 0)、吸附焓变(ΔH 0)、吸附熵变(ΔS 0)均大于煤质炭的,表明木质炭更易于吸附苯.
For better understanding the characteristics of adsorption of benzene on activated carbone,Analysis the physical and chemical characteristics of two kinds of carbon,the micro-surface area of coal carbon is 320 m2/g,which is far less than that of woody carbon that is 563 m2/g.The chemical groups on the surface of coal carbon is abundant than that on woody carbon.The qualitative analysis of the adsorption of water molecule on two kinds of carbon is conducted by Dubinin and Sperpinsky equation（DS）,the results show that,the coal carbon is prone to adsorb water molecule while the woody carbon is tend to adsorb benzene;Using four isotherm equations（Langmuir、Freundlich、Sips、Toth） to simulate the experimental data,the results show that the relativity coefficient（R2） of the Toth equation is more close to 1,and it best fits the adsorption of benzene from water;compare the parameters of thermodynamic of the adsorption of benzene on two kinds of carbons,the results indicate that differences of Gibbs free energy（-ΔG0）,enthalpy（ΔH0） and entropy（ΔS0） of woody carbon are larger than that of coal carbon,which indicate that the woody carbon is more adaptable to adsorb benzene from water.
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2010年第12期1892-1897,共6页
Journal of Harbin Institute of Technology
基金
国家“十一五”重大水专项(2009ZX07424-005-01)
中国博士后科学基金资助项目(20080430910)
哈尔滨市科技创新人才基金(2009RFQXS010)
