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Preparation method of environment-friendly hydrotalcite-like nanosheets

An environmentally friendly, hydrotalcite technology, applied in the fields of hydrotalcite, chemical instruments and methods, oxide/hydroxide preparation, etc., can solve the problems of complex process and difficult recovery of organic solvents, and achieve simple process, environmental friendliness, prevent The effect of re-aggregation

Active Publication Date: 2019-04-12
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the existing problems in the process of preparing nanosheets using hydrotalcite-like precursors, such as complicated process and difficult recovery of organic solvents, and provides an environmentally friendly preparation method of hydrotalcite-like nanosheets

Method used

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  • Preparation method of environment-friendly hydrotalcite-like nanosheets
  • Preparation method of environment-friendly hydrotalcite-like nanosheets

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Will [Mg 2+ 0.8 Al 3+ 0.2 (OH) 2 ][CO 3 2- 0.1 ] Hydrotalcite-like 1g, sodium lauryl sulfate 0.01mol, dispersed in 100mL of absolute ethanol; the above mixed solution was added to a supercritical reactor, and the temperature was adjusted to 240°C to keep the mixed solution in the supercritical state of ethanol Under 4 hours; return to normal temperature and normal pressure, take the supernatant in the mixed solution and centrifuge, dry to obtain hydrotalcite-like nanosheets; recycle the ethanol obtained after centrifugation into the remaining mixed solution, and add it to the supercritical reactor. Adjust the temperature to 240°C, keep the mixed solution in the supercritical state of ethanol for 4 hours; return to normal temperature and normal pressure, take the supernatant in the mixed solution, centrifuge, dry, and obtain hydrotalcite-like nanosheets again. The yield of hydrotalcite-like nanosheets collected twice was 32%.

[0020] From figure 1 It can be see...

Embodiment 2

[0023] Will [Co 2+ 0.66 Al 3+ 0.34 (OH) 2 ][CO 3 2- 0.17 ] Hydrotalcite-like 0.1g, sodium oleate 0.001mol, dispersed in 100mL of absolute ethanol; the above mixed solution was added to a supercritical reactor, and the temperature was adjusted to 270°C to keep the mixed solution in the supercritical state of ethanol for 2 Hours; return to normal temperature and normal pressure, take the supernatant in the mixed solution and centrifuge and dry to obtain hydrotalcite-like nanosheets; recycle the ethanol obtained after centrifugation into the remaining mixed solution, and add it to a supercritical reactor to adjust the temperature To 270°C, keep the mixed solution in the supercritical state of ethanol for 2 hours; return to normal temperature and normal pressure, take the supernatant in the mixed solution, centrifuge, dry, and obtain hydrotalcite-like nanosheets again. The yield of hydrotalcite-like nanosheets collected twice was 41%.

Embodiment 3

[0025] Will [Cu 2+ 0.13 Zn 2+ 0.51 Fe 3+ 0.36 (OH) 2 ][CO 3 2- 0.18 ] Hydrotalcite-like 0.1g, sodium oleate 0.001mol, dispersed in 100mL of absolute ethanol; the above mixed solution was added to a supercritical reaction kettle, the temperature was adjusted to 280°C, and the mixed solution was kept in the supercritical state of ethanol for 1 Hours; return to normal temperature and normal pressure, take the supernatant in the mixed solution and centrifuge and dry to obtain hydrotalcite-like nanosheets; recycle the ethanol obtained after centrifugation into the remaining mixed solution, and add it to a supercritical reactor to adjust the temperature To 280°C, keep the mixed solution in the supercritical state of ethanol for 1 hour; return to normal temperature and normal pressure, take the supernatant in the mixed solution, centrifuge, dry, and obtain hydrotalcite-like nanosheets again. The yield of hydrotalcite-like nanosheets collected twice was 33%.

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Abstract

The invention relates to a preparation method of environment-friendly hydrotalcite-like nanosheets, and belongs to the technical field of preparation of two-dimensional nano materials. Through the preparation method, complexity of the process, difficult recovery of organic solvents and other problems are solved in an existing process of nanosheet preparation by using a hydrotalcite-like compound as a precursor. The preparation method comprises the steps: dispersing the hydrotalcite-like compound and a stabilizer in anhydrous ethanol, adjusting the temperature and pressure so as to keep ethanolat a supercritical state for a period of time, and returning to the state of normal temperature and normal pressure so as to obtain the hydrotalcite-like nanosheets. Through conversion of ethanol between a supercritical state and a conventional state, the hydrotalcite-like compound is stripped effectively, and recycling use of ethanol is achieved. The disadvantages that multiple times of ion exchange are needed in the conventional method, and use of formamide and other organic solvents is needed are avoided, and the preparation method has the characteristics of environmental friendliness, a simple process and low cost.

Description

technical field [0001] The invention belongs to the technical field of preparation of two-dimensional nanometer materials, and in particular relates to a method for preparing a hydrotalcite-like nanosheet as a precursor. Background technique [0002] Due to their special planar structure, two-dimensional nanomaterials have received extensive attention and applications in catalysis, batteries, sensors, etc. Therefore, the development of simple, rapid, and environmentally friendly preparation methods for two-dimensional nanomaterials has become a current research hotspot. [0003] The hydrotalcite-like structure has a layered structure, and the layers show cationic charge properties, and CO 3 2- Counterion. The strong electrostatic interaction between the laminates makes it very difficult to prepare nanosheets by exfoliation of the laminates. In the usual preparation process, multiple ion exchange methods are first used to gradually replace CO with larger organic anions. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B13/14C01F7/00C01G9/00C01G49/00C01G51/00
CPCC01B13/14C01G9/006C01G49/009C01G51/006C01P2002/72C01P2004/04C01F7/785Y02P20/54
Inventor 张越温亮白雪丽黄鑫赵永祥
Owner SHANXI UNIV
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