Optical detection and efficient removal of transition metal ions from water using poly(hydroxamic acid) ligand

The green colour Cu-Ligand complex is shown in figure inset after adsorption of copper ion. The reflectance spectra were increased when increasing of Cu2+ ion concentration from 0 to 15 ppm. A broad peak at 673 nm was created when Cu2+ ion is adsorbed by ligand whereas blank polymeric ligand does not shows any peak at 673 nm.