Synthesis, Characterization of Poly(1,4–cyclohexanedimethylene oxalate) and the Study of its Metal Uptake Behavior Towards Pb(II), Zn(II), and Cd(II) Ions

Poly(1,4–cyclohexanedimethylene oxalate) was synthesized from oxalyl chloride and cis/trans–1,4–cyclohexandimethanol. The polymer was characterized by viscosity, FT–IR, NMR, elemental analysis, DSC, TGA, and SEM. The metal uptake behavior of the polymer towards Pb(II), Zn(II) and Cd(II) ions was studied by batch technique as a function of pH, temperature, concentration, contact time and by column technique. Their uptake increases slightly with pH reaching maximum at 6.00. The order of adsorption capacity was: Pb(II) > Cd(II) > Zn(II). The uptake of the polymer shows fittings to both Langmuir’s and Freundlich equations. ΔG°, ΔH° and ΔS° were determined for Pb(II). The metal-unbound polymer was regenerated by treating the metal-sorbed polymer with 1.0 M HNO3 >1.0 M HCl >0.01 M EDTA.

Yousef A. Al-Dalahmeh, Fawwaz I. Khalili, Bassam A. Sweileh