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Anion intercalation double-metal hydroxide adsorbent, preparation method and application thereof

An anion intercalation, hydroxide technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, water pollutants, etc., can solve the problem of unstable crystal size of adsorbents, and achieve easy industrial production and popularization. , The effect of large grain size and easy operation

Pending Publication Date: 2021-06-01
GUANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN 106881067 B "A Modified Hydrotalcite-like Adsorbent and Its Application" introduces the research on the adsorption of phytate-intercalated hydrotalcite to lead, but the one-step method is used in the synthesis process, which is easy to cause the crystal form of the synthesized adsorbent The size is unstable, and there is no report on the adsorption of cadmium ions

Method used

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  • Anion intercalation double-metal hydroxide adsorbent, preparation method and application thereof
  • Anion intercalation double-metal hydroxide adsorbent, preparation method and application thereof
  • Anion intercalation double-metal hydroxide adsorbent, preparation method and application thereof

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Embodiment 1

[0036] The preparation method of the double metal hydroxide adsorbent of anion intercalation comprises the following steps:

[0037] (1) Weigh 2.5642g soluble divalent metal magnesium salt magnesium nitrate and 1.6224g soluble trivalent metal aluminum salt aluminum nitrate, dissolve in 50mL deionized water to obtain mixed solution A;

[0038] (2) Add urea to the mixed solution A in step (1), the molar ratio of urea to the trivalent metal aluminum salt added in step (1) is 1:1, stir evenly, transfer to polytetrafluoroethylene reaction In the kettle, the hydrothermal temperature is 100 ℃, and the hydrothermal time is 48 hours. The reaction is carried out under hydrothermal conditions, centrifuged, washed with deionized water, and dried in an oven. The sample obtained is the precursor MgAl-CO 3 -LDH;

[0039] (3) Weigh 0.1g of the precursor MgAl-CO in step (2) 3-LDH was dissolved in 50mL decarbonated deionized water, nitric acid and sodium nitrate were added, and the molar conc...

Embodiment 2

[0044] The preparation method of the double metal hydroxide adsorbent of anion intercalation comprises the following steps:

[0045] (1) Weigh 2.5642g soluble divalent metal magnesium salt magnesium nitrate and 1.8756g soluble trivalent metal aluminum salt aluminum nitrate, dissolve in 50mL deionized water to obtain mixed solution A;

[0046] (2) Add urea to the mixed solution A in step (1), the molar ratio of urea to the trivalent metal aluminum salt added in step (1) is 1:3, stir evenly, transfer to polytetrafluoroethylene reaction In the kettle, the hydrothermal temperature is 120 ℃, and the hydrothermal time is 36 hours for reaction under hydrothermal conditions, centrifuged, washed with deionized water, and dried in an oven. The sample obtained is the precursor MgAl-CO 3 -LDH;

[0047] (3) Weigh 0.1g of the precursor MgAl-CO in step (2) 3 -LDH was dissolved in 80mL decarbonated deionized water, nitric acid and sodium nitrate were added, and the molar concentration of so...

Embodiment 3

[0052] The preparation method of the double metal hydroxide adsorbent of anion intercalation comprises the following steps:

[0053] (1) Weigh 2.5642g soluble divalent metal magnesium salt magnesium nitrate and 1.6224g soluble trivalent metal aluminum salt aluminum nitrate, dissolve in 50mL deionized water to obtain mixed solution A;

[0054] (2) Add urea to the mixed solution A in step (1), the molar ratio of urea to the trivalent metal aluminum salt added in step (1) is 1:5, stir evenly, transfer to polytetrafluoroethylene reaction In the kettle, the hydrothermal temperature is 140 ° C, the hydrothermal time is 24 hours under hydrothermal conditions, centrifuged, washed with deionized water, and the sample obtained after drying in an oven is the precursor MgAl-CO 3 -LDH;

[0055] (3) Weigh 0.1g of the precursor MgAl-CO in step (2) 3 -LDH was dissolved in 100ml decarbonated deionized water, nitric acid and sodium nitrate were added, and the molar concentration of sodium nit...

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Abstract

The invention provides an anion intercalation double-metal hydroxide adsorbent, a preparation method and application thereof, and belongs to the technical field of heavy metal adsorption materials. The preparation method disclosed by the invention comprises the following steps: carrying out hydrothermal reaction on a divalent metal magnesium salt, a trivalent metal aluminum salt and urea to obtain a precursor MgAl-CO3-LDH; adding nitric acid and sodium nitrate into the precursor to obtain a sample MgAl-NO3-LDH; and carrying out hydrothermal reaction on the MgAl-NO3-LDH and a sodium phytate salt hydrate to obtain the anion intercalation double-metal hydroxide adsorbent. Compared with other chelating agents, the MgAl-PA-LDH prepared by the method disclosed by the invention has a stronger chelating effect with metal ions and more adsorption sites, and has a very excellent treatment effect on sewage containing cadmium ions. The anion intercalation double-metal hydroxide adsorbent is prepared through an ion exchange method and a hydrothermal reaction, and the obtained product has better stability when being used in acidic sewage.

Description

technical field [0001] The invention relates to the technical field of heavy metal adsorption materials, in particular to an anion-intercalated double metal hydroxide adsorbent, a preparation method and application thereof. Background technique [0002] Cadmium is a highly toxic heavy metal. In recent years, the demand for cadmium raw materials in plastics, battery manufacturing, mining, papermaking, electroplating and other industries has grown rapidly, and it has also caused a large amount of cadmium-containing industrial wastewater to be discharged. A large amount of cadmium-containing wastewater will not only cause harm to the ecological environment, but also can be enriched in organisms. In particular, lower aquatic organisms such as algae have a strong ability to accumulate cadmium, which poses a serious threat to human health through the accumulation of food chains. In the human body, it damages the internal organs through chronic poisoning, resulting in damage to th...

Claims

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Application Information

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IPC IPC(8): B01J20/08B01J20/30C02F1/28C02F101/20
CPCB01J20/041B01J20/08C02F1/288C02F2101/20
Inventor 阮长平钟超然沈星灿
Owner GUANGXI NORMAL UNIV
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