LAYERED HYDROXIDE WITH HYDROTALCITE STRUCTURE CONTAINING NICKEL WITH OXIDATION RATE +3, AND METHOD FOR PREPARING IT

摘要

FIELD: chemistry.;SUBSTANCE: layered double hydroxide is described by general formula Mg_(1-x)Al³⁺ _(x-y)Ni³⁺ _y(OH)₂(An^n-)_x/n·mH₂O, wherein triply charged metal cations are simultaneously used as aluminium and nickel cations; y possesses the value of 0.0025 to 0.0625, and x=0.25. A method for preparing the above layered double hydroxide with a hydrotalcite-compound structure consists in the fact that a solution containing magnesium, aluminium and nickel nitrates with the total metal ion concentration is 1M; a precipitator solution containing sodium hydroxide and sodium hypochlorite is added at ~3 ml/min at constant stirring. The precipitate is subject to age hardening under a mother solution for 48 hours at room temperature and for 72 hours at 80°C. The mother solution is cooled to room temperature and rinsed. The precipitate is first subject to anionic exchange, washed in distilled water and dried at room temperature.;EFFECT: preparing the new magnesium-aluminium-nickel synthetic hydrotalcite-like materials containing nickel cations as a part of brucite-like layers with oxidation rate +3 and characterised by a single-phase nature, high crystallinity and stability of nickel with unstable oxidation rate +3.;3 cl, 4 dwg, 3 ex