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Nano calcium hydroxide/magnesium aluminum carbonate type nano hydrotalcite nanocomposite material and preparation method

A nano-composite material, nano-hydrotalcite technology, applied in the directions of hydrotalcite, chemical instruments and methods, calcium/strontium/barium oxide/hydroxide, etc., can solve the problems of the protection of cultural relics, the decrease of work efficiency, etc. , to achieve the effect of good ion removal capacity, large output and simple preparation process

Active Publication Date: 2020-06-16
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nano-calcium hydroxide can only be converted into calcium carbonate to protect cultural relics. Generally speaking, it takes at least two weeks for calcium hydroxide to be completely converted into calcium carbonate. The efficiency of work has dropped significantly
It is also difficult to be accepted by cultural relic protection workers (Journal of colloid and interface science 2013, 392, 42)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh MgCl 2 ·6H 2 O and AlCl 3 ·6H 2 O was dissolved in deionized water to make a solution. The above solution was added dropwise to the sodium hydroxide solution. where MgCl 2 ·6H 2 O,AlCl 3 ·6H 2 The molar ratio of O to deionized water was 7.5:2:1. The concentration of the sodium hydroxide solution was 0.2 mol / liter. The volume ratio of sodium hydroxide solution to deionized water is 1:4. The obtained precipitate was centrifuged and dispersed in 100ml of 0.1 mol / L sodium carbonate solution and left to stand for 6h. The solution after standing still was centrifuged and washed, and transferred to a reaction kettle to react at 100 degrees for 5 hours. After the reaction is completed, filter and dry to obtain magnesium aluminum carbonate type nano hydrotalcite powder.

[0021] Weigh 0.5g of magnesium aluminum carbonate type nano hydrotalcite powder. Add 1.6g of calcium chloride to 50ml of N,N-dimethylformamide solution to prepare a solution. Add 0.8 g of so...

Embodiment 2

[0024] Weigh MgCl 2 ·6H 2 O and AlCl 3 ·6H 2 O was dissolved in deionized water to make a solution. The above solution was added dropwise to the sodium hydroxide solution. where MgCl 2 ·6H 2 O,AlCl 3 ·6H 2 The molar ratio of O to deionized water was 7.5:2:1. The concentration of the sodium hydroxide solution was 0.25 mol / liter. The volume ratio of sodium hydroxide solution to deionized water is 1:4. The obtained precipitate was centrifuged and dispersed in 120ml of 0.15 mol / L sodium carbonate solution and left to stand for 8h. The solution after standing still was centrifuged and washed, and transferred to a reaction kettle to react at 110 degrees for 6 hours. After the reaction is completed, filter and dry to obtain magnesium aluminum carbonate type nano hydrotalcite powder.

[0025] Weigh 0.7g of magnesium aluminum carbonate type nano hydrotalcite powder. Add 1.8g of calcium chloride to 60ml of N,N-dimethylformamide solution to prepare a solution. Add 1.0 g of ...

Embodiment 3

[0028] Weigh MgCl 2 ·6H 2 O and AlCl 3 ·6H 2 O was dissolved in deionized water to make a solution. The above solution was added dropwise to the sodium hydroxide solution. where MgCl 2 ·6H 2 O,AlCl 3 ·6H 2 The molar ratio of O to deionized water was 7.5:2:1. The concentration of the sodium hydroxide solution was 0.3 mol / liter. The volume ratio of sodium hydroxide solution to deionized water is 1:4. The obtained precipitate was centrifuged and dispersed in 140 ml of 0.2 mol / L sodium carbonate solution and left to stand for 10 h. The solution after standing still was centrifuged and washed, and transferred to a reaction kettle to react at 120 degrees for 8 hours. After the reaction is completed, filter and dry to obtain magnesium aluminum carbonate type nano hydrotalcite powder.

[0029] Weigh 0.8g of magnesium aluminum carbonate type nano hydrotalcite powder. Add 2.2g of calcium chloride to 80ml of N,N-dimethylformamide solution to prepare a solution. Add 1.2 g of...

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PUM

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Abstract

The invention relates to a nano calcium hydroxide / magnesium aluminum carbonate type nano hydrotalcite nanocomposite material and a preparation method. Firstly, the magnesium aluminum carbonate type nano hydrotalcite is synthesized by a hydrothermal synthesis method. Then, the synthesized magnesium aluminum carbonate-type nano-hydrotalcite is added to the precursor solution of calcium hydroxide, and the nano-calcium hydroxide / nano-hydrotalcite nanocomposite material is finally synthesized by a solution method. The process is simple and the output is large. The application results show that the nano-calcium hydroxide / nano-hydrotalcite nano-composite material only takes about 6 hours from application to reinforcement, which greatly improves the work efficiency of cultural relics protection. At the same time, the NO 3 ‑ , Cl ‑ , SO 4 2‑ The large drop in content shows excellent ion removal ability. The material can be further extended to many fields of cultural relics protection.

Description

technical field [0001] The invention belongs to the field of material preparation, and relates to a nano calcium hydroxide / magnesium aluminum carbonate type nano hydrotalcite nanocomposite material and a preparation method. Background technique [0002] Nano hydrotalcite materials belong to anionic layered compounds. Layered compounds refer to a class of compounds with a layered structure, interlayer ions, and exchangeability. The intercalation and interlayer ion exchangeability of the main body of layered compounds under the action of strong polar molecules , some functional guest substances are introduced into the interlayer gap and the distance between the layers is stretched to form layer pillar compounds. (Bing Li et al., Journal of Alloys and Compounds 2016, 673, 265). Typical hydrotalcites are magnesium aluminum carbonate hydrotalcites: Mg 6 al 2 (OH) 16 CO 3 4H 2 O. Its structure is composed of MgO 6 Octahedrons share edges to form a unit layer, and the Mg o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/02C01F7/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01F11/02C01P2004/80C01F7/785
Inventor 李炫华朱金萌魏秉庆
Owner NORTHWESTERN POLYTECHNICAL UNIV