Ternary hydrotalcite adsorbent and preparation method and application thereof

An adsorbent, hydrotalcite technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, water pollutants, etc., can solve the problems of difficult regeneration, easy to produce pollution, etc., to achieve easy exchange, short adsorption equilibrium time, The effect of good adsorption performance

Pending Publication Date: 2019-09-06
EAST CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the technical problems of easy pollution and difficult regeneration of existing hydrotalcite adsorbents, and provides a ternary hydrotalcite adsorbent and its preparation method and application

Method used

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  • Ternary hydrotalcite adsorbent and preparation method and application thereof
  • Ternary hydrotalcite adsorbent and preparation method and application thereof
  • Ternary hydrotalcite adsorbent and preparation method and application thereof

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specific Embodiment approach 1

[0038] Specific embodiment one: the ternary hydrotalcite adsorbent of the present embodiment, its chemical formula is Mg 6 MZr(OH) 16 CO 3 ﹒ 4H 2 O. Wherein M is a divalent or trivalent metal element. Represented by MgMZr-LDH.

specific Embodiment approach 2

[0039] Embodiment 2: This embodiment is different from Embodiment 1 in that M is Mn or Al; the others are the same as Embodiment 1.

specific Embodiment approach 3

[0040] Specific embodiment three: the preparation method of the ternary hydrotalcite adsorbent described in specific embodiment one, carries out according to the following steps:

[0041] 1. Press Mg(NO 3 ) 2 ·6H 2 The molar ratio of O, divalent or trivalent metal nitrate and zirconium salt is 6: (1~2): (1~2), Mg(NO 3 ) 2 ·6H 2 O, divalent or trivalent metal nitrate and zirconium salt are added to dissolve in water to obtain mixed salt solution A;

[0042] 2. According to the molar ratio of sodium hydroxide and sodium carbonate (2-3): 1, add sodium hydroxide and sodium carbonate into water and dissolve to obtain mixed solution B;

[0043] 3. Add dropwise mixed solution B to the mixed salt solution A obtained in step 1 under stirring conditions, and control the pH value of the entire solution to be between 8 and 10 during the dropping process to obtain mixed solution C;

[0044] 4. Stir the mixed solution C under the condition of 15°C-80°C for 8-24 hours, then centrifuge, w...

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Abstract

The invention discloses a ternary hydrotalcite adsorbent and a preparation method and application thereof, relates to hydrotalcite and preparation and application thereof, and aims to solve the technical problems of easy pollution and difficult regeneration of the existing hydrotalcite adsorbent. The ternary hydrotalcite adsorbent is Mg6MZr(OH)16CO3.4H2O or Mg6MZr(OH)18, wherein M is a divalent ortrivalent metal element. The process is as follows: dropwise adding a sodium hydroxide and sodium carbonate mixed solution into a magnesium salt, divalent or trivalent metal salt and zirconium salt mixed salt solution, stirring for reacting, separating, drying and grinding to obtain Mg6MZr(OH)16CO3.4H2O; and calcining the Mg6MZr(OH)16CO3.4H2O to obtain Mg6MZr(OH)18. The Mg6MZr(OH)18can be used asadsorbents, catalysts or electrode materials. When used as an adsorbent, the adsorption equilibrium time is 100 min, the Mg6MZr(OH)18 can be recycled several times.

Description

technical field [0001] The present invention relates to hydrotalcite and its preparation and application. Background technique [0002] The economic development of human coastal areas and the increasing sea activities have led to a year-by-year decline in the quality of the near-shore environment, especially the eutrophication of seawater caused by the increasing concentration of nutrients such as phosphorus, which poses a threat to the marine environment and human health. In order to deal with the above problems, finding a material with fast and effective adsorption capacity for phosphate in water is the key to removing phosphate in aqueous solution and seawater by adsorption. [0003] Hydrotalcite-like materials have good physical and chemical properties, adjustable layer elements, interlayer anion exchange, and high stability, making them widely used in electrocatalysis, capacitor electrode materials, and heavy metal adsorption. However, there are relatively few studies ...

Claims

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Application Information

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IPC IPC(8): B01J20/04B01J20/08B01J20/30C02F1/28C02F101/10C02F103/08
CPCB01J20/041B01J20/043B01J20/0211C02F1/281B01J20/0222B01J20/08C02F2101/105C02F2103/08
Inventor 张爽柳玉辉
Owner EAST CHINA UNIV OF TECH
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