Thermodynamic Study of Sensitivity of Polyaniline based Nanocomposite Membrane towards Hazardous Dithiocarbamate

Abstract

Adsorption behavior of Thiram, a dithiocarbamate pesticide, was studied on the surface of nanocomposite polyaniline zirconium titanium phosphate (PANI-ZTP) cation-exchanger. Adsorption experiments were carried out as a function of time, initial pesticide concentration and temperature. Thermodynamic parameters (∆H°, ∆G°, ∆S°) were determined and the adsorption process was found to be exothermic. Spectrophotometric method was applied to determine dithiocarbamate compound at λ_max 420 nm. A pesticide-sensitive membrane electrode was fabricated using PANI-ZTP nanocomposite as an electroactive material. Its sensitivity towards this hazardous dithiocarbamate was monitored using potentiometry. The proposed method was applied to determine pesticide in synthetic mixture with good recovery.