Using of polyaniline and its derivatives for preparation of ion exchange membranes

In this work, ammonium peroxydisulfate ((NH4)2S2O8) was used as an oxidant and 1, 3, (6 or 7)- napthalenetrisulfonic acid (NTSA) was used as a dopant for the synthesis of polyaniline (PANI)and its derivatives as poly(N-ethylaniline), poly(N-methyllaniline) and poly(o-anisidine). The characterization of synthesized conducting polymers were determined by UV-Vis., IR, conductivity measurement and elemental analysis methods. Polyvinylidene fluoride (PVDF) membrane was modified by dissolving of the obtained polymers in methanol. Atomic Force Microscope (AFM) and Scanning Electron Microscope (SEM) were used for surface analysis of modified and unmodified PVDF membranes. The modified membranes were kept in hydrochloric acid solution to transform into the cation exchange form. The recoveries of Mg2+ and Ca2+ ions were carried out with these prepared membranes in both standart and real water samples by using Donnan dialysis method.