2024-03-29T09:24:18Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1486972019-04-10T04:30:30Zcom_10261_84com_10261_5col_10261_337
On the desiccant capacity of the mesoporous RF-xerogels
Díaz Alonso-Buenaposada, Isabel
Arenillas de la Puente, Ana
Menéndez Díaz, José Ángel
Ministerio de Economía y Competitividad (España)
Water sorption
Desiccant materials
Xerogels
Hydrophilic materials
Resorcinol-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.
2017-04-21T15:11:26Z
2017-04-21T15:11:26Z
2017-04-09
artículo
Microporous and Mesoporous Materials 248: 1–6 (2017)
1387-1811
http://hdl.handle.net/10261/148697
10.1016/j.micromeso.2017.04.014
http://dx.doi.org/10.13039/501100003329
eng
Postprint
http://doi.org/10.1016/j.micromeso.2017.04.014
Sí
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CTQ2014-54772-P
http://creativecommons.org/licenses/by/3.0/
openAccess
Elsevier