Equilibrium sorption of crystal violet by carboxymethylated cellulose with low degree of substitution

Abstract

Cellulose fabric samples were carboxymethylated for different duration. The degree of substitution was changing through a maximum value during the reaction time.The equilibrium sorption of a cationic dye by cellulosic fibers of different degrees of carboxymethylation was investigated in buffered and in unbuffered systems. The sorption isotherms were interpreted by two kinds of approximations based upon Langmuir isotherm. From the sorption data extrapolated to zero dye concentration aff'mities were calculated. The temperature dependence of affinities gave the values of heat and entropy of dyeing which were changing along the reaction time similarly to the degree of substitution.

Antimicrobial natural fibres

“…In addition to an antimicrobial effect, the modifi ed cotton demonstrated pesticide degradation ability under UV irradiation as well (Hong and Sun, 2008). Introducing anionic groups into the cellulose backbone increased the adsorption of crystal violet (Borsa et al , 1989). C. albicans could not survive on cotton fabric with a small dye content (0.3 mg/g); K/S value of the dyed fabric characterizes its antimicrobial activity (Borsa et al ., 2002a(Borsa et al ., , 2002b(Borsa et al ., , 2003.…”