Pure cobalt hydrotalcite compound and preparation method thereof

A hydrotalcite compound, hydrothermal aging technology, applied in cobalt compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of cobalt ion residues and underutilization

Active Publication Date: 2020-10-20
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because ammonia easily forms complexes with cobalt ions, some cobalt ions remain in the solution and cannot be fully utilized.

Method used

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  • Pure cobalt hydrotalcite compound and preparation method thereof
  • Pure cobalt hydrotalcite compound and preparation method thereof
  • Pure cobalt hydrotalcite compound and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A preparation method of pure cobalt-like hydrotalcite compound, comprising the steps of: weighing 11.1895 g Co(NO 3 ) 2 ·6H 2 O was dissolved in 256mL methanol-water mixed solvent, and the volume ratio of methanol and water was 1:1 to obtain cobalt nitrate solution. Weigh 0.5096g anhydrous Na 2 CO 3 Dissolve in 464mL methanol-water mixed solvent to get Na 2 CO 3 solution. Weigh 6.4000g NaOH and dissolve in 80mL methanol-water mixed solvent to obtain NaOH solution. Under room temperature and vigorous stirring, the cobalt nitrate solution was slowly dropped into Na 2 CO 3 solution, while adjusting the reaction system pH=10 with NaOH solution. After the cobalt nitrate solution was added dropwise, the obtained precipitate was filtered and washed with a methanol-water mixed solution, and the obtained solid was dried in an oven at 60 °C for 12 hours to obtain a pure cobalt-like hydrotalcite compound.

[0041] The crystal phase structure of the above samples was char...

Embodiment 2

[0043] A preparation method of pure cobalt-like hydrotalcite compound, comprising the steps of: weighing 11.1895g Co(NO 3 ) 2 ·6H 2 O was dissolved in 256mL methanol-water mixed solvent, the volume ratio of methanol and water was 4:1 to obtain cobalt nitrate solution. Weigh 0.5096 g anhydrous Na 2 CO 3 Dissolved in 464 mL of methanol-water mixed solvent to obtain Na 2 CO 3 solution. Weigh 6.4000 g NaOH and dissolve it in 80 mL methanol-water mixed solvent to obtain NaOH solution. Under room temperature and vigorous stirring, the cobalt nitrate solution was slowly dropped into Na 2 CO 3 solution, while adjusting the reaction system pH=10 with NaOH solution. After the cobalt nitrate solution was added dropwise, the obtained precipitate was filtered and washed with a methanol-water mixed solution, and the obtained solid was dried in an oven at 60 °C for 12 hours to obtain a pure cobalt-like hydrotalcite compound.

[0044] The crystal phase structure of the above samples...

Embodiment 3

[0046] A preparation method of pure cobalt-like hydrotalcite compound, comprising the steps of: weighing 11.1895g Co(NO 3 ) 2 ·6H 2 O was dissolved in 256mL methanol-water mixed solvent, the volume ratio of methanol and water was 8:1 to obtain cobalt nitrate solution. Weigh 0.5096 g anhydrous Na 2 CO 3 Dissolved in 464 mL of methanol-water mixed solvent to obtain Na 2 CO 3 solution. Weigh 6.4000 g NaOH and dissolve it in 80 mL methanol-water mixed solvent to obtain NaOH solution. Under room temperature and vigorous stirring, the cobalt nitrate solution was slowly dropped into Na 2 CO 3 solution, while adjusting the reaction system pH=10 with NaOH solution. After the cobalt nitrate solution was added dropwise, the obtained precipitate was filtered and washed with a methanol-water mixed solution, and the obtained solid was dried in an oven at 60 °C for 12 hours to obtain a pure cobalt-like hydrotalcite compound.

[0047] The crystal phase structure of the above samples...

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Abstract

The invention relates to the technical field of preparation of hydrotalcite-like compounds, and discloses a pure cobalt hydrotalcite-like compound and a preparation method thereof. A constant pH precipitation method is adopted, cobalt nitrate serves as a cobalt source, a mixed solution of methyl alcohol and water (the volume ratio is 1: 1-8: 1) serves as a solvent, the cobalt nitrate solution is slowly dropwise added into a sodium carbonate solution at the room temperature, the pH of the solution is adjusted to be 8-12, and the pure cobalt hydrotalcite is obtained through the steps of hydrothermal aging, suction filtration, washing, drying and the like. The hydrotalcite-like compound is single in crystalline phase, regular in structure and good in layered structure and flaky morphology, the average thickness of nanosheets ranges from 5.9 nm to 12.8 nm, and the high crystallinity degree is achieved. The preparation process is simple and easy to operate, the raw materials are cheap and easy to obtain, the preparation conditions are mild, the period is short, the purity and the yield of the hydrotalcite-like compound are high, and quantitative synthesis can be realized.

Description

technical field [0001] The invention belongs to the technical field of hydrotalcite-like preparation, and in particular relates to a pure cobalt-like hydrotalcite compound and a preparation method thereof. Background technique [0002] Hydrotalcite-like compounds are a class of layered compounds formed by electrostatic interactions between positively charged brucite-like laminates and interlayer anions, and their structural formula can be expressed as [M2+1− x M3+ x (OH) 2 ][A n− ] x / n · z h 2 O, where M 2+ for Mg 2 + 、Ni 2+ 、Co 2+ 、Cu 2+ , Zn 2+ Wait, M 3+ for Al 3+ , Fe 3+ , Mn 3+ , Ga 3+ Wait, A n− for CO 3 2– , NO 3 – , Cl – and organic anions. Hydrotalcite-like compounds exhibit unique physical and chemical properties due to the particularity of their structure, such as the tunability of layered cations and interlayer anions, the exchangeability of interlayer anions, and the "memory effect", etc., and are widely used in anion exchange. materials...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G51/00C01P2002/72C01P2004/03C01P2004/64
Inventor 李达林宛春生江莉龙
Owner FUZHOU UNIV
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