A new adsorption–desorption model for water adsorption in porous carbons
A new adsorption–desorption model for water adsorption in porous carbons
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DOI：
10.1016/j.carbon.2010.09.038
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发表时间：
2011-02
期刊：
影响因子：
10.9
通讯作者：
T. Horikawa;Tomoki Sekida;J. Hayashi;M. Katoh;D. Do
中科院分区：
文献类型：
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作者：
T. Horikawa;Tomoki Sekida;J. Hayashi;M. Katoh;D. Do
提出了一种新模型来描述精心合成的介孔碳材料中水吸附的吸附和解吸分支。该模型是 Do 等人提出的先前吸附-解吸模型的扩展。我们通过间苯二酚与甲醛在弱碱性水溶液中进行溶胶凝胶缩聚制备介孔间苯二酚-甲醛碳冷冻凝胶（RFCC），然后冷冻干燥，然后在氮气气氛下高温碳化RF冷冻凝胶。所得碳材料具有不同的表面和孔隙特性，这对于研究它们对 RFCC 水蒸气吸附和解吸的影响具有重要价值。使用实验数据来测试模型，我们发现该模型相当好地描述了所有数据。我们在分析中还观察到一些有趣但并不意外的结果：介孔中的水簇尺寸大于微孔中的水簇尺寸，介孔中吸附-解吸的滞后回线大于微孔中的滞后回线。
A new model is proposed to describe the adsorption and desorption branches of water adsorption in carefully synthesized mesoporous carbon materials. This model is an extension of a previous adsorption–desorption model proposed by Do et al. We prepared mesoporous resorcinol–formaldehyde carbon cryogels (RFCCs) by sol–gel polycondensation of resorcinol with formaldehyde in a slightly basic aqueous solution, followed by drying with freeze-drying and then carbonizing the RF cryogels at a high temperature under a nitrogen atmosphere. The resulting carbon materials have different surface and pore properties, which are valuable in the study of their effects on water vapor adsorption and desorption on RFCCs. The experimental data were used to test the model, and we have found that the model describes reasonably well all the data. We have also observed some interesting, but not unexpected, results in the analysis: the water cluster size in mesopore is larger than that in micropore, and the hysteresis loop of adsorption–desorption in mesopores is greater than that in micropores.