Equilibrium and Do−Do Model Fitting of Water Adsorption on Four Commercial Activated Carbons with Different Surface Chemistry and Pore Structure
Equilibrium and Do−Do Model Fitting of Water Adsorption on Four Commercial Activated Carbons with Different Surface Chemistry and Pore Structure
复制标题
DOI：
10.1021/je1006778
复制
发表时间：
2010-11
影响因子：
--
通讯作者：
Xin Li;Zhong Li
中科院分区：
文献类型：
--
作者：
Xin Li;Zhong Li
采用氮气吸附法和Boehm滴定法分别测定了4种市售活性炭的结构性质和表面酸性。水蒸气在活性炭上的吸附等温线通过重量法测量，并通过简化版本的Do−Do（DD）模型拟合。结果表明，简化的DD模型能很好地拟合空气中水汽的等温线。模型中的参数n值随着活性炭孔径的增大而增大，当平均孔径在1.96 ~ 2.8 nm之间时，n值非常接近于5。参数N 0的顺序与总表面基团浓度的顺序一致。参数CμS几乎等于AC在100%相对湿度下的吸附水量或其总孔体积的值。参数Kμ取决于孔径，并随着孔径的增加而减小。参数B的值取决于孔径a.
The textural properties and the surface acidities of four commercial activated carbons (ACs) were determined separately by nitrogen adsorption and Boehm titration. The adsorption isotherms of water vapor on the ACs were measured by the gravimetric method and fitted by the simplified version of the Do−Do (DD) model. The results indicated that all isotherms of water vapor on the ACs can be well-fitted by the simplified version of the DD model. The value of parameter n in the model increases with the pore size of the AC and is very close to 5 when the average pore diameter is between (1.96 and 2.8) nm. The order of parameter N0 is in good agreement with that of the total surface group concentrations. The parameter CμS is almost equal to the amount adsorbed of water on the AC at a relative humidity of 100 % or to the value of its total pore volume. The parameter Kμ depends on the pore size and decreases with increasing pore size. The value of parameter b depends on the combined contribution of the pore size a...