Adsorption and desorption characteristics of maltooligosaccharide for the surface treated activated carbons

The adsorption and desorption characteristics of maltooligosaccharide for raw and surface treated activated carbons were studied experimentally. The TLC imaging densitometry method was used in determining the sugar concentration in the maltooligosaccharide. Adsorption amount of larger molecules, such as maltopentaose and maltoheptaose on F400 were greater than those of smaller molecules. On the other hand, Adsorption amount of smaller molecules, such as maltose and maltotriose on SLS 103 were greater than those of larger molecules. Acid treatment of the GAC increases the carboxyl group, but did not affect much on the adsorption rate of saccharides. Heat treatment decreases the adsorption time of F400 due to substantial surface area increase. For the desorption of the adsorbed saccharides with ethanol, the amount of ethanol in the solution was more important than the concentration.