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On the desiccant capacity of the mesoporous RF-xerogels

AutorDíaz Alonso-Buenaposada, Isabel ; Arenillas de la Puente, Ana ; Menéndez Díaz, José Ángel
Palabras claveWater sorption
Desiccant materials
Hydrophilic materials
Fecha de publicación9-abr-2017
CitaciónMicroporous and Mesoporous Materials 248: 1–6 (2017)
ResumenResorcinol-formaldehyde xerogels are ideal desiccant materials since the high concentration of hydroxyl groups on their surfaces confers on them a high hydrophilicity, which adsorbs moisture from their surroundings and their large porosity provides them with a high water sorption capacity. In this study, the porosity of organic xerogels was tailored by adjusting the proportion of methanol in the precursor solution in order to optimize their desiccant capability. It was found that, although an increase in microporosity improves the performance of the desiccant, mesoporosity is a more important property for this application. Organic xerogels are excellent desiccants which are able to adsorb more than 80% of their own weight in moisture and function efficiently for more than 3000 h, when their porosity is optimized. This is a great improvement on the commonly used silica gels that become saturated after only 150 h and can only adsorb a maximum of 40 wt % of their own weight in moisture. Moreover, RF xerogels have the advantage that they are organic materials resistant to acid attack and this allows them to be used in processes where conventional inorganic desiccants would rapidly deteriorate.
Versión del editorhttp://doi.org/10.1016/j.micromeso.2017.04.014
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