Static sorption of heavy metal ions on ion exchanger in the presence of sodium dodecylbenzenesulfonate

The effect of sodium dodecylbenzenesulfonate (anionic surfactant) on removal of selected heavy metal ions such as copper(II), cobalt(II), zinc(II) and nickel(II) using Lewatit MonoPlus TP 220 were studied. The critical micellization of concentration in the system containing both heavy metal ions and the anionic surfactant was obtained (surface properties). The percentage removal of heavy metal ions in the system without the anionic surfactant was compared with that of heavy metal ions in the presence of the anionic surfactant of the concentration below (↓CMC) and above (↑CMC) (HCl—heavy metal ions—anionic surfactant systems). Moreover, Lewatit MonoPlus TP 220 was applied for the heavy metal ions removal from real wastewaters (used a pickling bath) originating from leaching of the heat-resistant nickel and cobalt alloys. The critical micellization of concentration values depends on the composition of solution, presence of hydrochloric acid and heavy metal ions. The presence of the surfactant improves slightly the removal efficiency of cobalt(II) and nickel(II) ions and deteriorates the zinc(II) removal efficiency. Lewatit MonoPlus TP 220 shows high affinity for copper(II) in the model and real wastewater solutions in the case of the systems without and with the anionic surfactant.