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Preparation method of brain-coral-shaped birnessite type manganese dioxide

A technology of birnessite and manganese dioxide, which is applied in the field of nano-material preparation, can solve the problems of high requirements for experimental equipment, high production costs, and difficulties in sample post-processing, and achieve the effects of low cost, convenient processing, and easy mass production

Inactive Publication Date: 2012-10-24
HEBEI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the synthetic processes require organic solvents, surfactants, templates or under high temperature and high pressure, which makes post-processing of samples difficult, resulting in high production costs, high requirements for experimental equipment, and a certain degree of impact on the environment.

Method used

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  • Preparation method of brain-coral-shaped birnessite type manganese dioxide
  • Preparation method of brain-coral-shaped birnessite type manganese dioxide
  • Preparation method of brain-coral-shaped birnessite type manganese dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Prepare 0.05mol / L KMnO 4 solution and an equal volume of 0.075mol / L MnSO 4 solution, and with H 2 SO 4 Adjust the pH value of both to 1, and then in KMnO 4 The solution is added to the KOH solution, and the amount of the substance added to the KOH is KMnO 4 2 times the amount of the substance (this amount of KOH can just be combined with the H generated during the reaction + completely neutralized), and then at room temperature, under the conditions of magnetic stirring, the KMnO obtained above 4 The solution was slowly added dropwise to the MnSO 4 In the solution, keep the pH value of the reaction system at 1 during the dropping process, KMnO 4 After the solution was added dropwise, it was stirred for another 15 min to obtain a dark brown solid precipitate, which was then centrifuged and washed with distilled water several times to remove possible remaining impurities in the target product. Finally, the obtained product was obtained at 110 ℃ drying overnight, th...

Embodiment 2

[0030] Prepare 0.05mol / L KMnO 4 solution and an equal volume of 0.075mol / L MnSO 4 solution, then to MnSO 4 solution and KMnO 4 A certain amount of H was added to the solution 2 SO 4 , so that the pH of the solution is 0, then in KMnO4 NaOH solution is added to the solution, and the amount of substance added with NaOH is KMnO 4 2 times the amount of the substance (this amount of NaOH can just completely neutralize the H+ generated in the reaction process), and then at room temperature and under the condition of magnetic stirring, the KMnO obtained above 4 The solution was slowly added dropwise to the MnSO 4 In the solution, keep the pH value of the reaction system at 0 during the dropping process, KMnO 4 After the solution was added dropwise, it was stirred for another 15 min to obtain a dark brown solid precipitate, which was then centrifuged and washed with distilled water several times to remove possible remaining impurities in the target product. Finally, the obtained...

Embodiment 3

[0032] Prepare 0.005mol / L KMnO 4 solution and an equal volume of 0.0075mol / L MnSO 4 solution, and with H 2 SO 4 Adjust the pH value of both to 2, and then in KMnO 4 A certain volume of KOH solution is added to the solution, and the amount of KOH added is KMnO 4 2 times the amount of the substance (this amount of KOH can just be combined with the H generated during the reaction + completely neutralized), and then at room temperature, under the conditions of magnetic stirring, the KMnO obtained above 4 The solution was slowly added dropwise to the MnSO 4 In the solution, keep the pH value of the reaction system at 2 during the dropping process, KMnO 4 After the solution was added dropwise, it was stirred for another 15 min to obtain a dark brown solid precipitate, which was then centrifuged and washed with distilled water several times to remove possible remaining impurities in the target product. Finally, the obtained product was obtained at 110 ℃ drying overnight, the b...

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Abstract

The invention discloses a preparation method of brain-coral-shaped birnessite type manganese dioxide, comprising the steps of: subjecting potassium permanganate and manganese sulfate, which are cheap and serve as reactants, to redox reaction in a water solution at room temperature, and obtaining the brain-coral-shaped birnessite type manganese dioxide by controlling the pH values of a manganese sulfate solution and a potassium permanganate solution to be 0-2 before mixture and controlling the pH of a reaction system in the mixing process of the two reactant solutions to be changeless. The preparation method provided by the invention is free from organic solvents, surfactants and templates as well as hydrothermal treatment, and has the advantages of simple preparation process, low cost, mild reaction conditions and environmental friendliness. The brain-coral-shaped birnessite type manganese dioxide prepared in the invention has the specific surface area reaching 140-220m<2> / g, the porevolume of 0.1-1cm<3> / g, the pore diameter of 15-50nm, and favorable structural stability.

Description

technical field [0001] The invention relates to a method for preparing brain coral-like birnessite-type manganese dioxide, which belongs to the technical field of nanomaterial preparation. Background technique [0002] Among manganese compounds, manganese dioxide is an oxide with important industrial uses. It has ion exchange and molecular adsorption properties, and can be used as ion sieve, molecular sieve and catalyst. At the same time, it has excellent electrochemical and magnetic properties. , can be used as positive electrode material and new magnetic material of lithium ion battery. Manganese dioxide is composed of the basic structural unit [MnO 6 ] The tunnel-like or layered manganese dioxide crystalline compound formed by octahedron sharing edges or sharing corners, due to the different composition methods, manganese dioxide has a variety of crystal forms. Birnessite-type manganese dioxide crystal is a kind of layered manganese dioxide crystal family, which is comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/02B82Y40/00
Inventor 马子川韩日日邢胜涛王茜
Owner HEBEI NORMAL UNIV
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