Water Adsorption on Activated Carbons: Study of Water Adsorption in Micro- and Mesopores
Water Adsorption on Activated Carbons: Study of Water Adsorption in Micro- and Mesopores
复制标题
DOI：
10.1021/jp010674b
复制
发表时间：
2001-07
影响因子：
3.3
通讯作者：
†‡ Juan Alcañiz-Monge;Á. Linares-Solano;B. Rand
中科院分区：
文献类型：
--
作者：
†‡ Juan Alcañiz-Monge;Á. Linares-Solano;B. Rand
水吸附的机制进行了分析，在一系列的活性炭不同的窄，宽的微孔，中孔，和大孔的相对比例。它们还显示出不同程度的表面功能。通过假设微孔中的吸附相是“冰状的”，表明整个微孔体积充满了P/P0约为0.82的水，此时毛细冷凝可能开始。然而，表面络合物控制吸附水对中孔壁的润湿，并可影响冷凝过程。在P/P0值高于0.95时也可能发生大孔中的冷凝。介孔/大孔填充的程度取决于表面复合物。微孔隙中的体积填充过程是渐进的，符合体积填充理论。吸附过程进行了分析，通过解释氮等温线系统地测量不同的孔结构的样品上的预吸附量逐渐增加的预吸附水。
The mechanism of water adsorption is analyzed in a range of activated carbons differing widely in the relative proportions of narrow and wide micropores, mesopores, and macropores. They also display different degrees of surface functionality. By assuming that the adsorbed phase in micropores is “ice-like”, it is shown that the whole micropore volume is filled with water at a P/P0 of about 0.82, at which point capillary condensation may begin. However, surface complexes control the wetting of the mesopore walls by adsorbed water and can influence the condensation process. Condensation in macropores may also occur at P/P0 values above 0.95. The extent of meso-/macropore filling depends on the surface complexes. The volume filling process is progressive and in micropores is consistent with the theory of volume filling. The adsorption process was analyzed by interpreting the nitrogen isotherms systematically measured on samples of different pore structure with progressively increasing amounts of preadsorbed w...