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  • Protonation behavior of cotton fabric with irreversibly adsorbed chitosan : a potentiometric titration study
    Čakara, Duško ...
    The protonation of cotton fabric with irreversibly adsorbed medical chitosan (CO-CT) was measured in aquatic medium at 0.1 M ionic strength by means of potentiometric titrations, and compared with ... the results obtained for pure cotton and chitosan. For CO-CT, the charging isotherm exhibits a charge reversal around pH ? 6.0, which is identified as the point of zero charge (PZC). The pure chitosan and the acid fraction that is present in cotton, protonate according to the one-pK model, with pKCT=6.3 and pKCO=4.7, respectively. At pH > PZC, the charge of the acid fraction in CO-CT is negative and constant, and the proton binding is attributed purely to the adsorbed chitosan. On the other hand, the cotton-bound acid exhibits a more complex protnation mechanism in CO-CT than in the pure fabric, which is evidenced as an excess positive charge at pH < PZC and a deviation from the one-pK behavior.
    Vir: Carbohydrate polymers. - ISSN 0144-8617 (Vol. 78, iss. 1, Aug. 2009, str. 36-40)
    Vrsta gradiva - članek, sestavni del
    Leto - 2009
    Jezik - angleški
    COBISS.SI-ID - 13188118
    DOI

vir: Carbohydrate polymers. - ISSN 0144-8617 (Vol. 78, iss. 1, Aug. 2009, str. 36-40)
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