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Синтез Fe-ZIF и особенности сорбции ионов цинка и меди на его поверхности
A method for the synthesis of a zeolite imidazolate framework based on Fe(III) at various metal/linker ratios is proposed, which is used as a sorbent for the extraction of zinc(II) and copper(II) ions. For the obtained materials, it was found that the particles have a hexagonal structure and represent a microheterogenic system with an average particle size of 0.05–0.1 microns. Nitrogen adsorption isotherms in Fe-ZIF pores have been obtained. As a result of their processing, the parameters of the porous structure of the synthesized samples were found. The adsorption of Cu2+ and Zn2+ ions from aqueous solutions at a temperature of 298.15 K was studied and their high degree of extraction was shown. The adsorption of copper and zinc ions is spontaneous in all cases. The maximum degree of filling of the active centers of the surface reaches 0.96 and 0.71 for copper and zinc, respectively. The course of adsorption in the volume of an energetically homogeneous porous adsorbent and the predominance of micropores in the structure of 2-ethylimidazolate of iron(III) have been established.