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Abstract: Surface ion-imprinting technique combined with a sacrificial support process was applied to synthesize Sr2+ ion-imprinted polymers (Sr-IIPs) in which yeast cells were used as sacrificial supports. The synthesized polymers were characterized by Fourier transmission infrared spectrometry, scanning electron microscope, transmission electron microscope and nitrogen adsorption-desorption analysis. The results indicated that Sr-IIPs possessed a relatively good dispersion and large surface area. Batch mode adsorption experiments were carried out to investigate the specific adsorption equilibrium, kinetics and selective recognition properties of Sr-IIPs. Sr-IIPs exhibited a fast kinetics adsorption capacity and high selectivity for adsorption of Sr2+. Under optimal experimental conditions, the adsorption of Sr2+ onto Sr-IIPs followed the pseudo-second-order kinetics model and was well-described by the Langmuir isotherm model. The monolayer adsorption capacity at 318 K was 60.61 mg g-1 for Sr-IIPs, which is over three-times that of NIPs. Thermodynamic parameters confirmed that the adsorption of Sr2+ onto Sr-IIPs was a spontaneous and endothermic process within the studied temperature range (298-318 K)
Template and target information: strontium ion, Sr(II)
Author keywords: Sr2+ ion-imprinted polymers, Sacrificial supports, adsorption, selective recognition