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A kind of preparation method of iron-based hydrotalcite

A hydrotalcite, iron-based technology, used in chemical instruments and methods, nickel compounds, inorganic chemistry, etc., can solve the problems of harsh crystallization conditions, complex synthesis methods, and high salt costs, achieve uniform crystal phase and particle size, and prepare Simple process and reduced usage

Active Publication Date: 2022-02-22
李大鹏
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This class passes the Fe 3+ The synthesis method of salt as raw material has relatively harsh crystallization conditions for hydrotalcite, and Fe 3+ The cost of salt is higher and the synthesis method is more complicated

Method used

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  • A kind of preparation method of iron-based hydrotalcite
  • A kind of preparation method of iron-based hydrotalcite
  • A kind of preparation method of iron-based hydrotalcite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] According to the molar ratio Ni:Fe=4:1, 2.700g of nickel sulfate hexahydrate and 0.714g of ferrous sulfate heptahydrate were added to 75mL of deionized water, and then a flow rate of 1m was introduced into the resulting solution. 3 Oxygen per hour, while gradually adding 1mol / L ammonia solution to control the pH of the reaction solution to 6.8-7.3, stirred and reacted at 40°C for 2 hours, then suction filtered and dried in a constant temperature drying oven at 150°C to obtain NiFe hydrotalcite.

Embodiment 2

[0030] In this example, according to Ni:Fe=2:1, 1.350 g of nickel sulfate hexahydrate and 0.714 g of ferrous sulfate heptahydrate were added to 75 mL of deionized water, and other steps were the same as in Example 1 to obtain NiFe hydrotalcite.

Embodiment 3

[0032] In this example, according to Ni:Fe=1:1, 0.675g of nickel sulfate hexahydrate and 0.714g of ferrous sulfate heptahydrate were added to 75mL of deionized water, and other steps were the same as in Example 1 to obtain NiFe hydrotalcite.

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Abstract

The invention discloses a preparation method of iron-based hydrotalcite. The method directly uses ferrous salt as raw material, and mixes ferrous salt with Mg 2+ , Zn 2+ 、Cu 2+ 、Ni 2+ 、Co 2+ , Ca 2+ , Mn 2+ Iron-based hydrotalcite can be obtained by oxidizing the soluble salts of such as iron by air or oxygen under the condition of pH 5.5-10.5. The preparation process of the present invention is simple, the reaction conditions are mild, Fe 3+ The source of raw materials is wide and cheap, and the obtained iron-based hydrotalcite has a high degree of crystallization, uniform crystal phase and particle size, and in the hydrotalcite prepared by the present invention, except for metal Fe, the amount of other metals in the hydrotalcite laminate can be compared with that of the traditional method. Much lower, the Fe prepared by the traditional method 3+ Divalent metal raw materials (Ni, Co, Cu, Zn, etc.) and Fe in the base hydrotalcite 3+ Hydrotalcite can only be synthesized when the metal molar ratio of the raw materials is generally greater than 2, but the method of the present invention can reduce the raw material ratio to 0.1, and can be used to synthesize hydrotalcite doped with other positive divalent metal elements at a low molar ratio.

Description

technical field [0001] The invention relates to a preparation method of iron-based hydrotalcite. Background technique [0002] Hydrotalcites, layered double hydroxides (LDHs), are materials with a wide range of applications. Since hydrotalcite was first prepared by chemical methods in 1942, the development and utilization of hydrotalcite materials has attracted more and more attention from scientists in the world today. Its chemical composition is: [M 2+ 1-x m 3+ x (OH) 2 ] x+ (A n- ) x / n mH 2 O, where M is the cation on the laminate, and the common cations that can enter the laminate are divalent metals: Cu 2+ , Mg 2+ 、Ni 2+ 、Co 2+ , Fe 2+ , Zn 2+ , Ca 2+ , Mn 2+ 、Pt 2+ etc.; trivalent metal: Al 3+ , Fe 3+ 、Cr 3+ etc., each layer of the lamina is an orderly and uniform planar structure formed by an octahedron composed of various cations and oxygen atoms through sharing corners and sharing edges; A is an anion between the layers, and the common anions ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G53/00C01G1/00
CPCC01G53/006C01G1/00C01P2004/03C01P2002/72
Inventor 李大鹏黄传峰蒋中山
Owner 李大鹏