H-K法研究ACFs的微结构

ＡＣＦｓ的吸附性能主要取决于比表面积和孔隙结构。在不同相对压力下的吸附行为对应不同的孔隙结构。在一定范围内微孔是决定吸附能力大小的重要因素。以Ｎ２吸附等温线为依据，采用Ｈ－Ｋ法考察了不同比表面积ＡＣＦｓ在微观结构以及吸附 的差异。

STUDY MICROSTRCTURE OF ACFs BY H-K METHOD

The adsorptive capacity of ACFs correlates mainly with the specific surface area and porous structure, moreover, the adsorption at different relative pressure matches with different pore size distribution. To some extent micropore structure is the most important factor to determine the adsorptive capacity. In the present study, the microstructure and adsorptive capacity of ACFs with different specific surface area are systematically investigated employing N 2 adsorption isotherm. The specific surface area of samples is calculated from the BET method, the microstructure is obtained from Horvath Kawazoe method. It is shown that there are plenty of ultramicropores (width less than 0.7 nm) in the ACF, which make ACF having the function of molecular sieve, and the pore size distribution of ACF becomes wider with increasing surface area. It is of interest to note that both the isotherm at supper low relative pressure and the normal one belong to type I.