Removal of Cetylpyridinium Bromide by Adsorption onto Maghnite: Application to Paper Deinking

Abstract

Abstract The removal of cetylpyridinium bromide (CPB) from aqueous solutions was investigated using a mineral adsorbent called Maghnite (a bentonite obtained from Maghnia, West Algeria). The adsorption kinetics of CPB on Maghnite is pseudo‐second order and the adsorption isotherm follows essentially the model of Redlich–Peterson. The results obtained show that CPB is adsorbed on Maghnite with an adsorption capacity of 0.438 mmol/g (168.4 mg/g). Physical data indicate that CPB is efficient for the deinking of newspaper solutions, only when the natural Maghnite is associated to CPB. These results are of practical interest, since CPB shows a double action—to protect and to optimize aquatic environment.