Trimetal layered double hydroxide and preparation method and application thereof

A double hydroxide and hydroxide technology, applied in chemical instruments and methods, water pollutants, other chemical processes, etc., can solve the problems of easy collapse of the structure, inability to adsorb at the same time, LDH can not be passivated at the same time, etc., to achieve stability Good performance, simple preparation method and low environmental pollution

Inactive Publication Date: 2020-05-01
SOUTHWEST UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the defects in the prior art that LDH cannot simultaneously passivate arsenic and cadmium in soil, cannot simultaneously adsorb arsenic and cadmium in water, and the structure is easy to collapse after LDH absorbs heavy metal ions, the present invention provides a three-metal layer Hydroxide and its preparation method and application

Method used

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  • Trimetal layered double hydroxide and preparation method and application thereof
  • Trimetal layered double hydroxide and preparation method and application thereof
  • Trimetal layered double hydroxide and preparation method and application thereof

Examples

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Embodiment 1

[0037] A kind of trimetal layered double hydroxide, has the nano-layered structure of double hydroxide, and general molecular formula is FeMnM-LDH, and wherein M is metal Ca or metal Ni, and wherein, the molar ratio of Fe, Mn and M is 1:1:2.

[0038] Preparation:

[0039] FeCl 3 ·6H 2 O, MnCl 2 4H 2 O and NiCl 2 ·6H 2 O according to Fe 3+ :Mn 2+ : Ni 2+ =1:1:2 was dissolved in 50mL of anaerobic water to prepare a metal ion salt mixed solution, wherein the total concentration of metal ions was 2mol / L; The pH was adjusted to 10 with NaOH. The entire apparatus was placed in a 60°C water bath. Under mechanical stirring and a nitrogen atmosphere, the metal ion salt mixed solution was added dropwise to the three-necked flask at a rate of 0.5 mL / min, and mechanical stirring was used to keep the pH of the solution at 10-13 throughout the process. After the dropwise addition was completed, continue to feed nitrogen into the forward three-necked flask, and continue stirring ...

Embodiment 2

[0050] Add 0.05g of FeMnNi-LDH and FeMnCa-LDH prepared in Example 1 into 50mL of 50mg / L Cd(II) solution respectively, the solution pH=5.5, shake at room temperature for 4h to reach adsorption equilibrium. The concentration of the solution was measured by ICP-OES, and the results showed that the concentration of Cd(II) decreased to 5.46mg / L after being adsorbed by FeMnNi-LDH, and the adsorption rate reached 89.08%; after being adsorbed by FeMnCa-LDH, the concentration of Cd(II) decreased to 0.78mg / L, the adsorption rate reaches 98.44%.

Embodiment 3

[0052] Add 0.05g of FeMnNi-LDH and FeMnCa-LDH prepared in Example 1 into 50mL of 50mg / L As(Ⅲ) solution respectively, the solution pH=5.5, shake at room temperature for 4h to reach adsorption equilibrium. The concentration of the solution was measured by ICP-OES, and the results showed that the concentration of As(Ⅲ) was reduced to 1.85 mg / L after being adsorbed by FeMnNi-LDH, and the adsorption rate was 96.3%; the concentration of As(Ⅲ) was reduced to 0.89mg / L, the adsorption rate reached 98.22%.

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Abstract

The invention belongs to the technical field of functional material preparation and heavy metal treatment, and particularly relates to trimetal layered hydroxide and a preparation method and application thereof. The trimetal layered double hydroxide has the same nanometer layered structure as double hydroxide; and the molecular general formula of the trimetal layered double hydroxide is FeMnM-LDH,wherein M is metal Ca or metal Ni, and a molar ratio of Fe to Mn to M is 1: 1: 2. A coprecipitation method is adopted to prepare the trimetal layered double hydroxide. The prepared trimetal layered double hydroxide FeMnM-LDH (wherein M is Ni or Ca) can passivate arsenic and cadmium in soil at the same time, and after the trimetal layered double hydroxide FeMnM-LDH adsorbs heavy metal ions, the layered structure of the trimetal layered double hydroxide FeMnM-LDH is still kept complete, free of collapse and good in stability.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional materials and treatment of heavy metals, and in particular relates to a trimetal layered hydroxide and its preparation method and application. Background technique [0002] In recent years, due to the development of the mining industry across the country, arsenic (As) and cadmium (Cd) have exceeded the standard in some rice field soils. Arsenic exists in the form of anions in soil, and its activity increases when the pH rises to alkaline soil; while the activity of Cd in soil increases with the decrease of pH. Therefore, since arsenic and cadmium exhibit opposite activities in soil, it is difficult to simultaneously passivate arsenic and cadmium. Tao Mengming (Adsorption of Humic Acid Loaded on Iron-Magnesium Oxide on Arsenic and Cadmium and Its Effect in Rice [D]. Zhejiang University, 2019.) Adding Humic Acid-loaded Iron-Magnesium Oxide Material to Arsenic and Cadmium Composite...

Claims

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Application Information

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IPC IPC(8): B01J20/08B01J20/30C02F1/28B09C1/00C02F101/20
CPCB01J20/0222B01J20/0225B01J20/041B01J20/08B09C1/00C02F1/281C02F2101/20
Inventor 魏世强廖玉梅蒋珍茂汤涵钰
Owner SOUTHWEST UNIVERSITY
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