Removal of lead(II) from water by di (2-ethylhexyl) phosphate containing ion exchange resin

Abstract

In the present study, commercially available chelating resin with the di (2-ethylhexyl) phosphate functional group (Lewatit VP OC 1026) has been evaluated for its suitability for the removal of Pb²⁺ from water. Studies for the removal of Pb²⁺ in different resin doses, pH of the solution, adsorption mechanism, and kinetic performance of resin were carried out. The obtained results showed that the removal performance of resin strongly depends on solution pH. More than 99% removal of Pb²⁺ was achieved at pH ⩾ 3. The experimental equilibrium data were tested for the Langmuir and Freundlich isotherms. Correlation coefficients indicate that the Langmuir isotherm fits better than the Freundlich isotherm. Pseudo-first- and -second-order kinetic models were used to describe kinetic data. It was determined that the removal of Pb²⁺ well-fitted by second-order reaction kinetics.

Keywords:

• Di (2-ethylhexyl) phosphate
• Ion exchange
• Kinetic models
• Lead
• Lewatit VP OC 1026

Acknowledgments

I thank Lanxess - Lewatit and their distributor in Turkey; Ökotek Environmental Technologies and Chemical Industries for sending me resin. I would like to acknowledge Raif Ilktac and Tulin Deniz Ciftci for AAS analyses.