Resorcinol-Formaldehyde Based Organic/Carbon Aerogel for Molecular Iodine Adsorption from Water
Using resorcinol and formaldehyde as raw materials,organic aerogel(RF500)was prepared via simple sol-gel and freeze-drying methods,and carbon aerogel(RFC500)was obtained by further carbonization at high temperature.The materials were charac-terized by various instrumental techniques including infrared spectroscopy,X-ray diffraction,scanning electron microscopy,trans-mission electron microscopy and nitrogen-sorption experiments.The results show that the obtained aerogels exhibit irregular mor-phology and belong to amorphous phase.In addition,after RF500 was converted to RFC500,the characteristic functional groups dis-appeared,and the content of macropores reduced with the increase of micropores and mesopores.The I2 adsorption abilities of RF500 and RFC500 were evaluated in two different water environments.The experiments revealed that RF500 with electron-rich or-ganic skeleton and RFC500 with large specific surface area and abundant mesopores show excellent adsorption properties in KI3 aqueous solution and I2 saturated aqueous solution,respectively.These aerogels can be used as potential sorbents for the removal of radioactive iodine from nuclear wastewater.
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