Abstract
Abstract Adsorption uptake of methylene blue and alizarin yellow by polyacrylonitrile (PAN), poly(acrylic acid) (PAC), polyacrylamide (PA) and poly(methylenebisacrylamide) (PMBA) from aqueous solutions was measured as a function of time. The adsorption of methylene blue was higher for PAN and lower for PAC; however, the adsorption of alizarin yellow was higher for PAC, PA, and PMBA, and lower for PAN. The acrylic polymers can be classified according to their adsorption characteristics using both dyes. The theoretical treatment of the experimental results was performed in terms of kinetics of dye adsorption, which is directly related to diffusion. A similar equation for diffusion-limited adsorption on textile materials and other diffusion-limited systems has been used. The equation was applied for short reaction times and the parameters were determined graphically from log-log plots: the specific rate constant k from the intercept A and the parameter n (0 < n < 1) from the slope. The diffusion coefficient ...
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