Mutual action of copper (II) and a nonionic surfactant (oxyethylated alcohols) on their simultaneous removal by a neutral hyper-cross-linked polystyrene adsorbent

Abstract

The mutual action of Cu(II) and nonionic surfactant Lutensol AO-10 on their sorption onto neutral hyper-cross-linked polystyrene Macronet MN-200 from mixtures has been investigated by the analysis of sorption equilibrium and kinetic data. The experimental equilibrium data were analyzed using the Langmuir and Freundlich models. The sorption mechanism of Cu(II) from one-component solutions or Cu(II) and AO-10 from their mixture corresponded to the Langmuir model rather than to the Freundlich one, whereas the sorption mechanism of AO-10 from one-component solutions proceeded according to the Freundlich rather than to the Langmuir model. The pseudo-second-order-reaction and intraparticle diffusion models (Weber–Morris plot) were used to describe the sorption kinetics, and to determine the sorption rate (k 2), intraparticle (k i) and external diffusion (k s) constants. The k 2 values obtained for Cu(II) sorption from solutions free from AO-10 was higher than those obtained for sorption from solutions free from...