Alpha-phase nickel hydroxide and preparation method and use thereof
Disclosed is an α-phase nickel hydroxide and a preparation method and use thereof. The method for preparing an α-phase nickel hydroxide comprises the following steps: subjecting a biomass calcium source to a calcination to obtain a porous calcium oxide; under a protective atmosphere, mixing the porous calcium oxide with a first methanol-ethanol solvent to obtain a calcium oxide heterogeneous solution; under a protective atmosphere, mixing the calcium oxide heterogeneous solution with a nickel source homogeneous solution to obtain a mixture, and subjecting the mixture to a coprecipitation to obtain a nickel calcium hydroxide precursor, wherein the nickel source homogeneous solution is prepared with a nickel source containing crystal water as a solute and a second methanol-ethanol solvent as a solvent; and subjecting the nickel calcium hydroxide precursor to a calcium hydroxide removal treatment to obtain the α-phase nickel hydroxide.
1. A method for preparing an α-phase nickel hydroxide, comprising the following steps:
subjecting a biomass calcium source to a calcination to obtain a porous calcium oxide;
under a first protective atmosphere, mixing the porous calcium oxide with a first methanol-ethanol solvent to obtain a calcium oxide heterogeneous solution;
under a second protective atmosphere, mixing the calcium oxide heterogeneous solution with a nickel source homogeneous solution to obtain a mixture, and subjecting the mixture to a coprecipitation to obtain a nickel calcium hydroxide precursor, wherein the nickel source homogeneous solution is prepared with a nickel source containing crystal water as a solute and a second methanol-ethanol solvent as a solvent; and
subjecting the nickel calcium hydroxide precursor to a calcium hydroxide removal treatment to obtain the α-phase nickel hydroxide; wherein the calcium hydroxide is formed by hydration of the porous calcium oxide with crystal water in the nickel source;
wherein the first methanol-ethanol solvent and the second methanol-ethanol solvent independently have a volume ratio of methanol to ethanol of 1:0.1 to 1:10;
wherein the calcium hydroxide removal treatment comprises removing calcium hydroxide by using a dilute hydrochloric acid; and
wherein a ratio of a mass of the nickel calcium hydroxide precursor to a number of moles of hydrochloric acid in the dilute hydrochloric acid is in a range of 1 g:(4-200) mmol.
2. The method of claim 1 , wherein the biomass calcium source comprises one or more selected from the group consisting of oyster shell, clam shell and egg shell.
3. The method of claim 2 , wherein the calcination is performed at a temperature of 900-1200° C. for 0.5-3 h.
4. The method of claim 1 , wherein the calcination is performed at a temperature of 900-1200° C. for 0.5-3 h.
5. The method of claim 1 , wherein a mass ratio of the porous calcium oxide to the nickel source containing crystal water is in a range of 1:0.1 to 1:250.
6. The method of claim 5 , wherein the coprecipitation is performed under stirring at a speed of 500-1000 rpm for 1-48 h.
7. The method of claim 1 , wherein the coprecipitation is performed under stirring at a speed of 500-1000 rpm for 1-48 h.
8. The method of claim 1 , wherein the dilute hydrochloric acid has a hydrochloric acid concentration of 0.1-1 mol/L.