Iron oxide nanostructures are obtained using chemical co-precipitation and low-temperature underwater plasma. It is shown that the chemical technique yields a mixture of Fe3O4 + alpha-Fe2O3 with a specific surface area of 33.66 m(2)/g. Plasma-solution samples are porous powders consisting of a mixture of Fe, FeO, alpha-Fe2O3, and Fe3O4. The adsorption of copper and zinc ions from solutions with mixtures of them is studied and quantitative characteristics are determined. Hammett indicators reveal the distribution of acid-base centers, depending on the means of synthesis. It is shown that the way of obtaining nanostructures affects the selectivity of adsorption with respect to Cu2+ or Zn2+.
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