The development of new anion-exchange stationary phases with improved selectivity and performance is one of topical problems in modern ion chromatography. Various classes of organic compounds are used as surface modifiers of the stationary phase matrix. In recent years, there is an increased interest in the use of ionic liquids allowing one to vary the nature of cation moiety in a wide range, which provides a way to control properties of materials on their basis. Earlier, our team has prepared and characterized silica gel with covalently immobilized imidazolium salt (with a particle size of 40-60 µm) and studied its ion-exchange characteristics in the solid-phase extraction of Pd(II) in chloride media. It seemed interesting to obtain similar material with a particle size of 8-12 µm and to determine whether it can be used as a stationary phase in ionexchange chromatography.The research object was a covalently modified silica gel:
The ion-exchange behavior of an organomineral material with an imidazolium (1-methyl-3-(prop-2-yn-1-yl)-1H-imidazol-3-ium bromide)-modified silica gel was studied for the extraction of Ag(I) from nitric acid media. The extraction from multicomponent systems containing Fe(III), Co(II), Ni(II), Cu(II), Pb(II), and Mn(II) in 100- and 1000-fold molar excesses with respect to Ag(I) was shown to occur with high selectivity. Based on the data of X-ray diffraction and X-ray fluorescence spectroscopy for samples of modified silica gel, a mixed ion exchange–adsorption mechanism for the extraction of Ag(I) was proposed. The effect of the phase contact time and the concentration of nitric acid on the distribution coefficient of Ag(I) was studied. The selectivity factors of the extraction of Ag(I) from multicomponent systems containing foreign cations in 100- and 1000-fold molar excesses under steady-state and dynamic concentration conditions were calculated.
This manuscript describes the preparation of a simple effective ion-exchange material based on silica gel, on the surface of which methylimidazolium bromide is fixed using a click reaction. The resulting material was used as a stationary phase for the separation and determination of Cl–, NO2–, NO3–, I–, and SO42– using ion exchange chromatography. The separation efficiency and retention factors for the selected anions were studied in the pH range 3.5–6.5. The proposed material was used for the determination of Cl–, SO42– in water and can be suggested for successful use in real water samples.
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