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Nanometer manganese carbonate/graphene hydrogel complex and preparation method thereof

A graphene hydrogel, nano-carbonic acid technology, applied in nano-carbon, graphene, manganese compounds and other directions, can solve problems such as affecting the purity of manganese carbonate, instability of melamine, easy decomposition reaction, etc., and achieves a simple and reliable preparation method. Good electrochemical performance, effect of good electrochemical performance

Active Publication Date: 2012-10-31
NANJING UNIV OF SCI & TECH
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Problems solved by technology

The preparation methods of manganese carbonate particles reported in the literature mainly include methods such as ultrasound, precipitation, or hydrothermal / solvothermal methods: Lu Chunling et al published "submicron In the article "Manganese Carbonate Preparation and Shape Control", it is proposed that the shape of manganese carbonate can be controlled by controlling the ultrasonic frequency, concentration and temperature. Although this technical solution is simple to operate, there are still shortcomings: is not easy to form high-purity manganese carbonate crystals; The frequency has certain harm to the human body
Although this technical solution preliminarily explores the growth mechanism of manganese carbonate microcrystals, there are shortcomings: The reaction needs to be placed in a low-temperature constant-temperature water bath It is difficult to obtain manganese carbonate particles with good dispersion at high temperature; is easy to introduce impurities and affect the purity of manganese carbonate;The particle size of manganese carbonate formed is micron instead of nano, which limits the scope of application of manganese carbonate
However, there are still the following deficiencies: melamine is unstable under hydrothermal conditions and easily undergoes decomposition reactions; Manganese carbonate can be obtained by changing the acidity and alkalinity of the solution, but the decomposition mechanism is not yet clear; The manganese carbonate crystals formed did not reflect its application value
However, these methods have failed to take full advantage of the large specific surface area of ​​graphene, and the operation is complicated, and conductive substances need to be added during the test, which is not conducive to improving the electrochemical performance of the finished product.
At present, there is no research on manganese carbonate and graphene composite to prepare nano-manganese carbonate / graphene hydrogel composite

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  • Nanometer manganese carbonate/graphene hydrogel complex and preparation method thereof
  • Nanometer manganese carbonate/graphene hydrogel complex and preparation method thereof
  • Nanometer manganese carbonate/graphene hydrogel complex and preparation method thereof

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preparation example Construction

[0020] combine figure 1 , the preparation method of a kind of nano-manganese carbonate / graphene hydrogel compound that the present invention proposes, it is characterized in that comprising the following steps:

[0021] The first step of mixing: the MnCl 2 The aqueous solution was added to the graphene oxide aqueous solution, and under the conditions of stirring and ultrasonic oscillation, a uniform MnCl 2 / graphene oxide suspension;

[0022] The second step is to mix again: KMnO 4 Add the aqueous solution to the MnCl obtained in the first step 2 / Graphene oxide suspension forms a reaction liquid with it;

[0023] The third step reaction: the reaction solution obtained in the second step is placed in a closed reaction kettle for constant temperature reaction, and the chemical equation is:

[0024] , , , to obtain the crude product of nano-manganese carbonate / graphene hydrogel composite;

[0025] The fourth step of washing: adding deionized water to the crude nano...

Embodiment 1

[0030] Mixing step 1: Mix 40 μl MnCl 2 Aqueous solution (100 mg / ml) was added to 2 ml graphene oxide aqueous solution (5 mg / ml), under the conditions of stirring and ultrasonic oscillation for 45 min, a uniform MnCl 2 / graphene oxide suspension;

[0031] Second step remixing: 4 mg KMnO 4 Dissolve in 0.4 ml water to form KMnO 4 aqueous solution, 0.4 ml KMnO 4 Add the MnCl obtained in the first step to the aqueous solution 2 / Graphene oxide suspension forms a reaction liquid with it;

[0032] The third step reaction: the reaction solution obtained in the second step is placed in a closed reaction kettle for constant temperature reaction, the reaction temperature is 180 o C, the reaction time is 48 h, and the crude product of nano-manganese carbonate / graphene hydrogel composite is obtained;

[0033] The fourth step of washing: the crude nano-manganese carbonate / graphene hydrogel composite obtained in the third step is washed with 100 ml of deionized water to obtain the fi...

Embodiment 2

[0036] Mixing step 1: Mix 20 μl MnCl 2 Aqueous solution (100 mg / ml) was added to 2ml graphene oxide aqueous solution (5 mg / ml), under the conditions of stirring and ultrasonic oscillation for 45 min, a uniform MnCl 2 / graphene oxide suspension;

[0037] The second step is to mix again: mix 2mg KMnO 4 Dissolve in 0.4 ml water to form KMnO 4 aqueous solution, 0.4 ml KMnO 4 Add the MnCl obtained in the first step to the aqueous solution 2 / Graphene oxide suspension forms a reaction liquid with it;

[0038] The third step reaction: the reaction solution obtained in the second step is placed in a closed reaction kettle for constant temperature reaction, the reaction temperature is 180 o C, the reaction time is 48 h, and the crude product of nano-manganese carbonate / graphene hydrogel composite is obtained;

[0039] The fourth step of washing: wash the crude nano-manganese carbonate / graphene hydrogel composite obtained in the third step with 120 ml of deionized water to obtain...

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Abstract

The invention relates to a nanometer composite material, and in particular relates to a nanometer manganese carbonate / graphene hydrogel complex and preparation method thereof. The nanometer manganese carbonate / graphene hydrogel complex is prepared by the following steps: a first step of mixing: adding MnCl2 water solution into graphene oxide suspending liquid to obtain MnCl2 / graphene oxide suspending liquid under the conditions of stirring and sonic oscillation; a second step of mixing again: adding KMnO4 water solution into MnCl2 / graphene oxide suspending liquid to form reacting liquid; a third step of reacting: putting reacting liquid into an airtight reaction kettle to react at the constant temperature to obtain a nanometer manganese carbonate / graphene hydrogel complex crude product; and a fourth step of washing: washing the nanometer manganese carbonate / graphene hydrogel complex crude product with deionized water to obtain a nanometer manganese carbonate / graphene hydrogel complex finished product. The nanometer manganese carbonate / graphene hydrogel complex has good electrochemistry performance, and is widely suitable for fields of catalysis materials, electrode materials and the like. The preparation method is simple and reliable, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a nano composite material, in particular to a nano manganese carbonate / graphene hydrogel composite and a preparation method thereof. Background technique [0002] In recent years, the controlled synthesis of nanomaterials with unique microscopic morphologies has received extensive attention. Among them, manganese carbonate particles are favored because of their broad prospects in the preparation of manganese metal, manganese alloys, high-purity manganese tetraoxide, pigments, soft ferrite and other fields. The preparation methods of manganese carbonate particles reported in the literature mainly include methods such as ultrasound, precipitation, or hydrothermal / solvothermal methods: Lu Chunling and others published "submicron In the article "Manganese Carbonate Preparation and Shape Control", it is proposed that the shape of manganese carbonate can be controlled by controlling the ultrasonic frequency, concentration and temper...

Claims

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Application Information

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IPC IPC(8): C01G45/00C01B31/04B82Y30/00B82Y40/00C01B32/184
Inventor 朱俊武汪信袁菁菁陈胜刘孝恒韩巧凤杨绪杰陆路德梁士明陈丽
Owner NANJING UNIV OF SCI & TECH
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