Effect of pore structure and surface chemical properties on adsorption properties of activated carbons
孔结构和表面化学性质对活性炭吸附性能的影响

Adsorption isotherms of CO2,CH4 and N2 on three granular activated carbons(GAC-C,GAC-P and GAC-T) were determined at room temperature.Pore structure and surface chemical properties of granular activated carbons were characterized,and the effect of them on adsorption properties was investigated.The results showed that the relationships of gases adsorption capacity and uptake coefficient on granular activated carbons were CO2>CH4>N2,because of the differences of adsorption mechanism,pore structure,surface functional groups and molecular polarity.The adsorption capacities of CH4 and N2 were mainly controlled by micropore volume of activated carbon,and the differences of N2 and CO2 adsorption capacity were affected by micropores from 0.572 to 2.0 nm and pores from 0.4 to 6.0 nm,respectively.And uptake coefficient of CH4,was more relational with mesopore and macropore,while uptake coefficients of N2 and CO2 were mainly controlled by micropore and macropore,respectively.