The water uptake of the all adsorbents increased with a same trend as the pH of solu tion increased. This behavior can be explained by the pKa values of amine groups on chitosan (pKa 6.5) and sulfate pendants on K-carrageenan (2 pKa)19.3 11. Thus, the amines groups on chitosan are protonated at the pHs lower than 6.5; whereas due to the low pKa value of sulfate groups, K-carrageenan is in its ionized form in
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