Adsorption behaviour of aqueous solutions of acid red-4, acid green-25 and sulphorhodamine-B on activated silica gel in relation to shaking time and solution pH has been studied. It is observed that the dyes are chemisorbed on the surface of silica gel. The effect of pH has been explained in terms of protonation of the dyes.
MAQSOOD HUSSIAN ,MUHAMMAD JAVED IQBAL ,
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