Two samples of partially carboxymethyl cellulose derivatives of different D.S. values were prepared
from Egyptian rice straw via pulping followed etherification using different concentrations
of monochloro acetic acid under the catalytic action of sodium hydroxide. The prepared derivatives
were assessed for D.S. and evaluated as dye adsorbent for different classes of dyestuff.
The results obtained indicate that, the D.S. increases from 0.09 to 0.14 by increasing monochloro
acetic acid from 5 to 10 g/100g cellulose pulp. The rate of dye absorbance increases by increasing
the amount of adsorbent as well as the time of adsorption. While as the dye concentration
increases from 0.01 to 0.5 the percent dye absorption decrease regularly. However, the magnitude
of the percent decrease in the colour depends on : (a) the nature of the dyestuff used ,(b) the D.S.
of the adsorbent, and (c) on the technique applied . The magnitude of colour removal in case of
using ultrasonic technique is relatively higher than the mechanical shaking irrespective of the
nature of the dye used and/or the conditions of adsorbance. The percent colour removal follows
the order Basic green> Basic yellow> Acid green> Acid blue respectively