Protonation behavior of cotton fabric with irreversibly adsorbed chitosan: A potentiometric titration study (CROSBI ID 245780)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Čakara, Duško ; Fras, Lidija ; Bračič, Matej ; Stana Kleinschek, Karin
engleski
Protonation behavior of cotton fabric with irreversibly adsorbed chitosan: A potentiometric titration study
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 protonation 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.
Chitosan ; Cotton ; Protonation ; Adsorption ; Charge ; pH ; pK ; Titration ; Potentiometric ; Medical ; Antimicrobial
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Podaci o izdanju
78 (1)
2009.
36-40
objavljeno
0144-8617
1879-1344
10.1016/j.carbpol.2009.04.011