Investigation of aromatic compounds sorption from aqueous solutions by thermally expanded graphite
Abstract
The results of investigation of the possibility of thermally expanded graphite based on graphite nitrate, cointercalated with ethyl formate and acetic acid, using for water purification from aromatic compounds are presented. The possibility of carbon sorbents using, in particular thermally expanded graphite, for water purification from aromatic compounds is directly related to the study of their sorption capacity. Thermally expanded graphite (TEG), synthesized and studied by us earlier, was used as a sorption material in this work. It is a highly porous material with high ability to regenerate, low consumption and relatively low cost. TEG is chemically inert, heat-resistant, has a high specific surface area, and also shows good sorption capacity relative to various toxicants., Monoaromatic hydrocarbons: benzene and phenol were used as adsorbates for the experiments. The static sorption capacity investigations were carried out by UV spectroscopy method at 20 ºС. Adsorption isotherms were obtained based on the experimental values of sorption capacity. Obtained isotherms can be related to S class according to C.H. Giles classification. The values of the maximum sorption capacity of TEG relative to benzene and phenol were determined in the studied concentration range of toxicants – 0.25 and 6.95 g/g of sorbent, respectively.
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