Adsorption of Strontium (II) on new ion-imprinted solid-phase support: determination, isotherms, thermodynamic and kinetic studies

Abstract

An ion imprinted polymer (IIP) based on aniline-formaldehyde was synthesized and then modified with extra aniline as cross-linker in the presence and absence of Sr (II) as the template to produce ion imprinted poly(anilineformaldehyde) (IIPAF) and non imprinted poly(aniline-formaldehyde) (NIPAF). The sorbent was characterized by Fourier Transform Infrared Spectroscopy and was used for solid phase extraction. The kinetics of the sorption was analyzed using the pseudo-first order and pseudo-second order kinetic models. The equilibrium adsorption data of Sr (II) on synthetic polymer were analyzed by Langmuir, Freundlich, Temkin and Redlich-Peterson models. The thermodynamic parameters were determined using the equilibrium constant values obtained at different temperatures. The results showed the negative values of ∆Gº and positive ∆Hº which indicated that the Sr (II) adsorption process is spontaneous and endothermic. The method was applied for strontium ions determination from Tap water samples.

Keywords

• Kinetic
• Strontium (II)
• ion imprinted polymers aniline-formaldehyde
• Adsorption