Journal of Colloid and Interface Science, Vol.183, No.1, 118-123, 1996
Adsorption and Recovery of Nonionic Surfactants by Beta-Cyclodextrin Polymer
Adsorption and recovery of nonionic surfactants (alkylphenol ethoxylate; APE) from aqueous solution was studied using beta-cyclodextrin polymer (beta CD-P). A 150-ml aqueous solution containing 200 ppm of APE and 1 g of beta CD-P was shaken for 2 h in a batchwise test using a beaker. The results indicated that about 85% of APE was adsorbed on beta CD-P from aqueous solution and also the adsorbed APE was released from beta CD-P by shaking with a mixture of water and various kinds of alcohols, such as methanol, ethanol, propanol, 2-propanol, and t-butanol. Regenerated beta CD-P was reusable as an adsorbent. The APE recovery efficiency was dependent on the ratio of the mixture of water and each alcohol, Furthermore, the continuous recovery of APE was studied using a column charged with beta CD-P at 25, 50, and 70 degrees C, and also the adsorption isotherms were obtained by observing the equilibrium concentration and the amount of adsorbed APE at the same temperatures.