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A method for preparing two-dimensional cobalt-aluminum composite oxides with hydrotalcite and its application

A composite oxide, hydrotalcite technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, water pollutants, etc., can solve the problem of difficult to obtain large-area two-dimensional layered materials, organic The problems of low degradation rate of pollutants and poor catalytic performance can achieve the effects of simple preparation process, suppression of collapse, and mild preparation conditions.

Active Publication Date: 2022-06-07
WUHAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, due to the high positive charge density of the hydrotalcite sheet and the strong anion electrostatic interaction with the sheet, it is difficult to peel off, and it is difficult to obtain a large-area, flexible two-dimensional layered material, which limits the development of this method to a certain extent. The application of similar materials, especially when used as a catalyst to catalyze and activate persulfate to degrade organic pollutants in wastewater (such as aniline in aniline wastewater), the catalytic performance is not good so that the degradation rate of organic pollutants in wastewater is not high

Method used

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  • A method for preparing two-dimensional cobalt-aluminum composite oxides with hydrotalcite and its application
  • A method for preparing two-dimensional cobalt-aluminum composite oxides with hydrotalcite and its application
  • A method for preparing two-dimensional cobalt-aluminum composite oxides with hydrotalcite and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] (1) CoCl of 0.01mol / L2 Solution, 0.01mol / L of AlCl 3 Solution, 0.03mol / L of six-time methyltetraamine solution and 0.01mol / L melamine solution are mixed sequentially according to the volume ratio of 1:3:5:0.5 to form a mixture; Then the mixture is heated to 80 °C for hydrothermal reaction for 12h, after the reaction is completed, the solid products are separated, washed and dried, and the water talc is inserted;

[0058] (2) The prepared intercalation hydrotalgalc is heated to 330 °C at a heating rate of 5 °C / min in an air atmosphere, and then heated to room temperature after the end of insulation, and multi-layer hydrotalga is supernatural;

[0059] (3) The prepared multilayer hydrotalx is put into 50mL formamide, sonicated for 6h under the conditions of 40Hz and 25 °C, and then the solid substances are separated, washed and dried to obtain a single layer of hydrotalcite;

[0060] (4) The prepared single-layer water talc is heated to 600 ° C in the air atmosphere and kept ...

Embodiment 2

[0062] (1) The CoCl of 0.02mol / L will be placed 2 Solution, 0.03mol / L of AlCl 3 The solution, 0.01mol / L of the sixth methyltetraamine solution and the 0.01mol / L melamine solution are mixed sequentially according to the volume ratio of 1:1:2:1 to form a mixture; Then the mixture is heated to 120 °C for hydrothermal reaction for 6h, after the reaction is completed, the solid products are separated, washed and dried, and the water talc is inserted;

[0063] (2) The prepared intercalation hydrotalgalc is heated to 300 °C at a heating rate of 3 °C / min in an air atmosphere, and then heated to 0.5h after heat preservation, and naturally cooled to room temperature after the end of insulation, with multiple layers of hydrotalgalc;

[0064] (3) The prepared multilayer hydrotalgalc is put into 80mL of formamide, sonicated for 3h under the conditions of 50Hz and 30 °C, and then the solid substances are separated, washed and dried to obtain a single layer of hydrotalcite;

[0065] (4) The prep...

Embodiment 3

[0067] (1) CoCl of 0.05mol / L2 Solution, 0.05mol / L AlCl 3 The solution, 0.12 mol / L of the sixth methyltetraamine solution and the 0.02mol / L melamine solution are mixed sequentially according to the volume ratio of 1:1:2:0.5 to form a mixture; Then the mixture is heated to 110 °C for hydrothermal reaction for 8h, after the reaction is completed, the solid products are separated, washed and dried, and the water talc is inserted;

[0068] (2) The prepared intercalation hydrotalgalc is heated to 280 °C at a heating rate of 2 °C / min in an air atmosphere, and after the insulation is ended, it is naturally cooled to room temperature, and multiple layers of hydrotalite are heated;

[0069] (3) The prepared multilayer hydrotalcite is put into 60mL of formamide, sonicated at 60Hz, 20 °C for 8h, and then the solid substances are separated, washed and dried to obtain a single layer of hydrotalcite;

[0070] (4) The prepared single-layer water talc is heated to 650 °C in an air atmosphere and h...

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Abstract

The invention discloses a method for preparing a two-dimensional cobalt-aluminum composite oxide with hydrotalcite and its application. The method for preparing a two-dimensional cobalt-aluminum composite oxide with hydrotalcite comprises: mixing a cobalt salt solution, an aluminum salt solution, six times Methyltetramine solution and nitrogen-rich compound solution are mixed to form a mixed solution, heated to 60-120°C for hydrothermal reaction for 6-12 hours, and then the solid product is separated to obtain intercalated hydrotalcite; the intercalated hydrotalcite The talc is heated to 250-330° C. and roasted for 0.5-2 hours, and cooled to obtain multi-layer hydrotalcite; the multi-layer hydrotalcite is placed in an organic solvent for ultrasonic treatment, and then the solid matter is separated to obtain a single-layer hydrotalcite; The single-layer hydrotalcite is heated to 500-800° C. and calcined for 0.5-2 hours, and then cooled to obtain a two-dimensional cobalt-aluminum composite oxide. When the two-dimensional cobalt-aluminum composite oxide prepared by the hydrotalcite is used to catalyze and activate persulfate to degrade aniline wastewater, the degradation rate of aniline is improved.

Description

Technical field [0001] The present invention relates to a two-dimensional layered material preparation technology field, specifically relates to a method for preparing two-dimensional cobalt-aluminum composite oxides from hydrotalcite and its applications. Background [0002] Two-dimensional layered materials usually refer to crystalline materials composed of a single or multiple atomic layers, with a thickness between 1 and 10 nm. Two-dimensional layered materials have many excellent physical and chemical properties, and have great potential in many fields such as catalysis, electronics, energy storage and energy conversion, especially since the successful stripping of single-atom layer graphene, the research and development of two-dimensional layered materials has attracted the research interest of many researchers. [0003] As an ionic layered material, hydrotalite is mainly assembled from positively charged sheets and anions between sheets, and the metal cations in the sheet ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/75B01J35/10C02F1/72C02F101/38
CPCB01J23/75B01J23/002B01J35/1004C02F1/725C02F2101/38
Inventor 费会王纯黄雪临李子洋
Owner WUHAN POLYTECHNIC UNIVERSITY
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