2.3.3. Adsorption and desorption studies of lac dye on
cotton pretreated with chitosan and on untreated
cotton, and on cotton in the presence of 0.5 M
NaCl without pH control
The cotton yarn, prepared as noted in Section 2.1.1., with
and without the pretreatment with a 0.3% (v/v) of aqueous
solution of chitosan was dyed with an initial dye concentration
of 473 mg/L in a thermostatted shaker bath operated at
75 rpm. The adsorption conditions were pH 3.0, MLR of
1:100 and 30 C. The absorbance of the dye solutions was
monitored until constant absorbance values were obtained