Pristine, Chromogenic Polyaniline - A Novel Sorbent for Ion Exchange of Sodium Salts in Aqueous Solution

Abstract

The sorption characteristics and ion exchange behaviour of polyaniline picrate (PANIPI) with various sodium salts (NaF, NaCl, NaBr, NaNO2, NaNO3, NaClO4, Na2SO4, NaH2PO4, NaOH, Na2CO3 and NaHCO3) have been studied. Langmuir, Freundlich, Temkin and Redlich-Peterson isotherm models are tested to describe the equilibrium established between PANIPI resin and solutions of sodium salt. The correlation coefficients show that Langmuir, Freundlich and Temkin models fit well for this sorption process. The sorption constants and negative ∆G° values indicate that the sorption of sodium salts on PANIPI is a favourable process. The ion exchange capacity (IEC) of the pristine PANIPI with these salts lie in the range of 1.96-3.49 meq/g and the separation factor (α) vary between 0.71-3.88 for the sodium salts used in the present study. These parameters indicate the suitability of PANIPI as a good ion exchanger. The UV-visible and FT-IR spectral changes before and after sorption are analysed to explain the sorption mechanism. The sorption capacities determined from the batch experiments are in the range 80-100 % for the sodium salts. The regenerative ability of PANIPI resin is ascertained from the column experiments conducted in three cycles. PANIPI is also found to possess antibacterial and antifungal activities. Hence, this novel chromogenic PANIPI resin has potential applications in desalination and ion detection processes.

Electrical Conductivity and Ion Exchange Properties of Polyaniline Antimony Tin Tung state Nano composite

“…They possessed high ion exchange capacity and found good applications in separating and removing metal ions from aqueous medium 7,8 . Ion-exchange character and electrical conductivity of polyaniline synthesized by various methods were also reported [9][10][11] . But a composite of these has not been reported so far and hence in this study, we synthesized antimony tin tungstate as the inorganic part and polyaniline is incorporated into the matrices to get a nanocomposite of improved properties.…”