Combined sorption of cobalt(II) and nonionic surfactant by polyacrylic acid-functionalized cation exchanger

Abstract

The kinetics of combined sorption of cobalt(II) and nonionic surfactant ALM-10 by hydrogen form of Purolite C 106 polyacrylic acid-functionalized cation exchanger were investigated: kinetic curves were obtained determining the concentration of nonionic surfactant spectrophotometrically, and that of cobalt(II) complexometrically. Reducing the initial solution acidity from pH 5 to 8, the coefficients of intraparticle diffusion (D) for cobalt(II) increase, although they decrease as the cation exchanger saturation increases. The sorption of the surfactant proceeds slower than that of cobalt(II).

Regeneration of the cation exchanger was performed using 0.7 M HCl for the removal of cobalt(II), 0.5 M NaOH for the removal of the surfactant, and 0.7 M HCl for the conversion to hydrogen form. Hydrogen form of Purolite C 106 can be applicable for the simultaneous removal of nonionic surfactant and cobalt(II) from plating rinse sewage to recover water for recycling.

Keywords:

• Heavy metal
• Nonionic surfactant
• Sorption
• Cation exchanger

Acknowledgments