The effect of pH value on K/S values is illustrated in Fig. 4.The maximum dye uptake was observed at pH 3. Dye uptake increased from the initial pH 3 until pH 5, and then decreased at higher pH values. In the alkaline solution, reaction withhydroxide ions (OH−) converts the ammonium ion (NH3+) toamino (NH2) groups and the fiber contains more carboxylate ion(