Synthesis and characterization of whisker surface imprinted polymer and selective solid-phase extraction of trace Sr(II) from environment aqueous solution

Abstract

A novel surface ion-imprinted polymer (S-IIP) has been synthesized by surface ion-imprinting concept in the presence of sodium trititanate whisker, Sr(II), chitosan and γ-glycidoxypropyl trimethoxysilane (KH-560) for selective solid-phase extraction of trace Sr(II) from environment aqueous solution. Characterizations of S-IIP were achieved by infrared spectra and surface area measurement. S-IIP was used in the sorption–desorption process; the effect of solution pH, sorbent amount, and flow rate on the extraction of Sr(II) ions from aqueous solutions was investigated. The adsorption kinetics and isotherm were also obtained in detail. The dynamical study showed it was well followed the pseudo-second-order kinetic equation in the adsorption process. Meanwhile, the equilibrium adsorption studies showed that it very good fit the Langmuir isotherm equation for the monolayer adsorption process, and the maximum adsorption capacity was 32.60 mg/g. Selectivity experiments showed that S-IIP had a higher selectivity than non-imprinted polymer. The thermodynamic parameters (positive values ΔG°, ΔH°, and ΔS°) confirmed the non-spontaneous, endothermic, and entropy gained nature within the temperature range evaluated. The precision relative standard deviation and detection limit of this method were 0.93% and 0.30 μg/L, respectively, and it was successfully applied to the determination of trace Sr(II) in different wastewater samples with satisfactory results using inductively coupled plasma atomic emission spectrometry.