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Method for preparing nano manganese dioxide of different crystal forms and appearances by adopting microwave hydrothermal method

A technology of nano-manganese dioxide and microwave hydrothermal method, which is applied in the direction of manganese oxide/manganese hydroxide, nanotechnology, nanotechnology, etc., can solve the problem that the crystal form and shape of the reaction product are difficult to control, and achieve controllable product quality , wide applicability, large specific surface area effect

Inactive Publication Date: 2010-04-28
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common problem of the above-mentioned methods is that the reaction adopts the traditional heat conduction heating method, which makes the hydrothermal reaction time as long as 10 to 20 hours, which makes it difficult to control the crystal form and morphology of the reaction product

Method used

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  • Method for preparing nano manganese dioxide of different crystal forms and appearances by adopting microwave hydrothermal method
  • Method for preparing nano manganese dioxide of different crystal forms and appearances by adopting microwave hydrothermal method
  • Method for preparing nano manganese dioxide of different crystal forms and appearances by adopting microwave hydrothermal method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] First weigh 2.53g of analytically pure potassium permanganate KMnO 4 Dissolve in 300ml of deionized water, then add 5-6ml of concentrated hydrochloric acid with a mass concentration of 36% to the solution, add water to make the total amount of the solution reach 400ml, stir until the solution is uniform, pour the prepared solution into The sealable reaction vessel is placed in a microwave field (microwave frequency is 2.45GHz) for microwave irradiation, the solution temperature is controlled at 110°C, and the holding time is 1 hour. After the reaction, the generated precursors are separated, washed and dried. Figure 1 ~ Figure 3 The picture obtained for characterizing the product obtained in Example 1, wherein, figure 1 It is the XRD pattern of the product, which is very consistent with the spectral line No.52-0556 of δ-phase manganese dioxide with rhombohedral structure in the JCPDS database, indicating that the product is δ-phase manganese dioxide; the electron micro...

Embodiment 2

[0027] First weigh 2.53g of analytically pure potassium permanganate KMnO 4 Dissolve in 300ml of deionized water, then add 5-6ml of concentrated hydrochloric acid with a mass concentration of 36% into the solution, add water to make the total solution to 400ml, stir until the solution is uniform, pour the prepared solution into The sealable reaction vessel was placed in a microwave field (microwave frequency 2.45 GHz) for microwave irradiation, the solution temperature was controlled at 140° C., and the holding time was 1 hour. After the reaction, the generated precursor was separated, washed and dried. Figure 4 ~ Figure 6 The picture obtained for characterizing the product obtained in Example 1, wherein, Figure 4 It is the XRD spectrum of the product, and this spectral line is very consistent with the spectral line No.72-1982 of α-phase manganese dioxide with tetragonal structure in the JCPDS database, indicating that the product is α-phase manganese dioxide; the electron m...

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Abstract

The invention discloses a method for preparing nano manganese dioxide of different crystal forms and appearances by adopting microwave hydrothermal method. The steps are as flows: (1) dissolving potassium hypermanganate in water, adding hydrochloric acid, and stirring to prepare a reaction solution; (2) pouring the reaction solution into a sealable reactor, placing the reactor in a microwave field for microwave radiation with microwave frequency being 2.45GHz, temperature being 105-115 DEG C, and heat preservation time being 0.5-2h, separating, washing and drying the generated precursor to obtain petal-shaped nano delta-phase manganese dioxide. In step (2), the temperature of the reaction solution is 135-145 DEG C, and the product of the reaction is alpha-phase manganese dioxide nanotube. The invention features simple technique, low cost, controllable product quality, extensive applicability and the like, the prepared nano manganese dioxide is applicable to fundamental theoretical research in such fields as battery, molecular sieve, catalyst and magnetic materials, and the research and development of related function materials.

Description

Technical field: [0001] The invention relates to a method for preparing nano manganese dioxide, in particular to a method for preparing nano manganese dioxide with different crystal forms and shapes by using a microwave hydrothermal method, which belongs to the field of inorganic non-metallic materials. Background technique: [0002] The basic structural unit of manganese dioxide is a hexagonal close-packed structure and a cubic close-packed structure coordinated by one manganese atom and six oxygen atoms. In a close-packed structure, the individual atomic layers form tetrahedral and octahedral cavities. The most common structure is [MnO 6 ] octahedron and adjacent octahedrons share edges and corner vertices, forming a complex network that can accommodate various cations and coordination substances, which may cause nano-manganese dioxide to form different crystals. There are five different crystal forms, such as α, β, δ, γ and ε, which are more common, and through the cont...

Claims

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Application Information

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IPC IPC(8): C01G45/02B82B3/00
Inventor 王介强王孙昊
Owner UNIV OF JINAN
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