ИСТИНА

Oxidized DND were obtained by various approaches using acids (nitric and sulfuric acids, their mixtures, and mixtures with hydrogen peroxide), as well as by thermal oxidation in air. The obtained samples were used in sorption experiments under batch conditions with nitrates of Cu, Ni, Pb, Cd, and Zn. Ion concentrations before and after the sorption were determined by inductively coupled plasma atomic emission spectroscopy. The surface after the oxidation and sorption was investigated by IR spectroscopy. Samples were regenerated by treatment with concentrated nitric acid with boiling and heating in PTFE autoclaves at 250°C.