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Layered double hydroxide composite material and preparation method and application thereof

A layered bimetal and hydroxide technology, applied in the field of environmental governance, can solve the problems of small distance between layers, few effective functional groups, low adsorption efficiency, etc., and achieve the effect of ensuring stability

Inactive Publication Date: 2020-12-11
中科院过程工程研究所南京绿色制造产业创新研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, single LDH has disadvantages such as low adsorption efficiency, less effective functional groups, unstable chemical properties, and small interlayer distance.

Method used

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  • Layered double hydroxide composite material and preparation method and application thereof
  • Layered double hydroxide composite material and preparation method and application thereof
  • Layered double hydroxide composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] This embodiment provides a method for preparing a layered double metal hydroxide composite material, the preparation method comprising the following steps:

[0064] 0.5g Mg-Al-CO 3 2- -LDH and 0.5g tetrasodium iminodisuccinate were dispersed in degassed deionized water to form a suspension, stirred at 20°C for 1440min; after the intercalation reaction, solid-liquid separation was performed, followed by washing with degassed deionized water and acetone, The layered double metal hydroxide composite material was obtained after vacuum drying.

[0065] The SEM image of the resulting layered double metal hydroxide composite figure 1 shown.

[0066] Mg-Al-CO described in this example 3 2- -LDH is the Mg-Al layered double metal hydroxide prepared by the hydrothermal method, and the hydrothermal method specifically includes the following steps:

[0067] Mix magnesium nitrate, aluminum nitrate and urea according to the molar ratio of 2:1:10 to obtain a mixed solution. The c...

Embodiment 2

[0069] This embodiment provides a method for preparing a layered double metal hydroxide composite material, the preparation method comprising the following steps:

[0070] 0.5g Mg-Al-CO 3 2- -LDH and 1g of tetrasodium iminodisuccinate were dispersed in degassed deionized water to form a suspension, and stirred at 10°C for 2880 min; after the intercalation reaction, solid-liquid separation was performed, followed by washing with degassed deionized water and acetone, vacuum After drying, the layered double metal hydroxide composite material is obtained.

[0071] Mg-Al-CO described in this example 3 2- -LDH is the Mg-Al layered double metal hydroxide prepared by the hydrothermal method, and the hydrothermal method specifically includes the following steps:

[0072] Mix magnesium nitrate, aluminum nitrate and urea according to the molar ratio of 1.8:1:8 to obtain a mixed solution. The concentration of magnesium nitrate in the mixed solution is 0.09mol / L; hydrothermal reaction is...

Embodiment 3

[0074] This embodiment provides a method for preparing a layered double metal hydroxide composite material, the preparation method comprising the following steps:

[0075] 0.5g Mg-Al-CO 3 2- -LDH and 1.5g of tetrasodium iminodisuccinate were dispersed in degassed deionized water to form a suspension, stirred at 80°C for 2100 min; after the intercalation reaction, solid-liquid separation was performed, followed by washing with degassed deionized water and acetone, The layered double metal hydroxide composite material was obtained after vacuum drying.

[0076] Mg-Al-CO described in this example 3 2- -LDH is the Mg-Al layered double metal hydroxide prepared by the hydrothermal method, and the hydrothermal method specifically includes the following steps:

[0077] Mix magnesium nitrate, aluminum nitrate and urea according to the molar ratio of 2.2:1:12 to obtain a mixed solution. The concentration of magnesium nitrate in the mixed solution is 0.11mol / L; hydrothermal reaction i...

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Abstract

The invention relates to a layered double hydroxide composite material and a preparation method and application thereof. The layered double hydroxide composite material is obtained by introducing biodegradable iminodisuccinic acid anions with excellent chelating performance into layered double hydroxide nanocrystals and performing functionalizing. The obtained layered double hydroxide composite material has the advantages of high specific surface area, porosity and the like, also has strong chelating ability to metal cations, especially heavy metal cations, is safe, environment-friendly, efficient and good in cycle performance, and can be applied to adsorption and treatment of heavy metal pollution of water bodies and soil.

Description

technical field [0001] The invention belongs to the technical field of environmental treatment and relates to an adsorption material and its preparation method and application, in particular to a layered double metal hydroxide composite material and its preparation method and application. Background technique [0002] The development of metallurgy, mining, nuclear energy, and chemical manufacturing has released a large amount of toxic heavy metal ions into the natural environment, posing a serious threat to the surface and underground environments. Due to the continuous accumulation of heavy metal ions, high toxicity, non-degradability, and strong permeability, they are easy to accumulate in organisms and can cause lethal toxicity even at low concentrations. Therefore, they pose a serious threat to human health and the entire ecosystem; heavy metals pollute wastewater The treatment and soil remediation has become a research hotspot in the field of separation science and envi...

Claims

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Application Information

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IPC IPC(8): C09K17/08
CPCC09K17/08
Inventor 刘开琪孙广超闫明伟熊瑞张佳钰陈运法
Owner 中科院过程工程研究所南京绿色制造产业创新研究院
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