Evaluation of Sorption Behavior of Polymeric Resin [poly 4, 4'-(naphthyl bis(oxy))bisbenzaldehyde cthylenediamine] for Cu (II) and Ni (II) ions

摘要

The synthesis of a new polymeric resin [poly 4,4'-(naphthyl bis(oxy))bisbenzaldehyde ethylenediimine] (PNBOBen) by polymerization from dialdehyde 4,4'-naphthylbis(oxy) bisbenzaldehyde with ethylenediamine in m-cresol is described The synthesized Schiff base polymer (PNBOBen) was characterized by elemental microanalysis, FT-IR and ~1H-NMR spectroscopy. The thermal degradation pattern of PNBOBen resin was also measured at higher temperature. The dialdehyde (NBOB) and Schiff base polymer (PNBOBen) were soluble in various common organic solvents including tetrahydrofuran (THF), dimethylformamide (DMF), dimethylacetamide (DMAc) and dimethylsulphoxide (DMSO). The metal uptake behavior of PNBOBen was investigated for Cu (II) and Ni (II) ions and optimized with respect to the sorptive medium (pH), shaking rate and equilibration time. The resin exhibited lower swelling ratios in an acidic medium because of the protonation in the imine group of polymer. The sorption of Cu (II) and Ni (II) by PNBOBen, followed Langmuir, Freundlich, and Dubinin-Radushkevich (D-R) isotherms. Thus in both metal ions, Cu (II) was sorbed slightly better than Ni (II) ions onto the polymeric resin (PNBOBen).