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Preparation method and applications of nano-manganese oxide

A nano-manganese dioxide and oxidant technology, applied in the direction of manganese oxide/manganese hydroxide, nanotechnology, nanotechnology, etc., can solve the problems of increasing the contact surface of chemical reactions, deteriorating surface smoothness, and incomplete coordination of surface atoms. Achieve the effect of saving the crushing and grinding process, reducing agglomeration and shortening the production cycle

Active Publication Date: 2015-07-15
HUNAN RES INST FOR NONFERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to make better use of manganese dioxide, nano-manganese dioxide with special properties can be used. Nanoparticles have many unique properties, such as small size, large surface area, different bonding and electronic states on the surface from those inside the particle, and atomic coordination on the surface. The position is incomplete, leading to the increase of surface active sites. With the decrease of particle size, the smoothness of the surface becomes worse, forming uneven atomic steps, which increases the contact surface of chemical reactions. At present, the main production methods of nano manganese dioxide are: Mechanical crushing method, electrochemical precipitation method, sol-gel method, microemulsion method, template method, co-precipitation method, redox deposition method, chemical reduction deposition method, hydrothermal method, mechanochemical method, self-assembly method, physical steam Deposition method, high-temperature solid-state reaction method, these methods have high requirements on equipment, and the process is complicated, so it is urgent to find a method for preparing nano-manganese dioxide with low equipment requirements and simple and feasible process.

Method used

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  • Preparation method and applications of nano-manganese oxide

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Embodiment 1

[0027] A kind of preparation method of nano-manganese dioxide of the present invention, comprises the following steps: take chemically pure manganese sulfate and potassium permanganate respectively by the proportioning ratio of the amount of substance of 1:10, and dissolve respectively in high-purity water, add to sulfuric acid Add polyethylene glycol-200 accounting for 0.01% of the mass of manganese sulfate into the manganese solution as an active agent; drop potassium permanganate solution into the manganese sulfate solution at a rate of 0.5 drops / min, ultrasonically disperse, and react at 25°C for 48 hours , nano-manganese dioxide is suspended in the solution, the solution is filtered, and the filtered precipitate is rinsed several times. During the washing process, polysorbate accounting for 0.01% of the product mass is added as a dispersant, filtered, and heated at 30 ± 5 and drying at ℃, so as to obtain nano-manganese dioxide with uniform nanowire network structure.

[0...

Embodiment 2

[0031] A kind of preparation method of nano-manganese dioxide of the present invention, comprises the following steps: take chemically pure manganese carbonate and potassium permanganate respectively by the proportioning ratio of the amount of substance of 1:10, and dissolve respectively in high-purity water, add to sulfuric acid Add polyethylene glycol-400 accounting for 0.01% of the mass of manganese carbonate to the manganese solution as an active agent; drop potassium permanganate solution into the manganese carbonate solution at a rate of 60 drops / min, stir mechanically to disperse, and react at 30°C For 48 hours, nano-manganese dioxide was suspended in the solution, the solution was filtered, and the filtered precipitate was washed several times. During the washing process, 0.01% ethanol was added to the product mass as a dispersant, filtered, and dried at 30 ± 5 and drying at ℃, so as to obtain nano-manganese dioxide with uniform nanowire network structure.

[0032] An ...

Embodiment 3

[0034] A kind of preparation method of nano manganese dioxide of the present invention, comprises the following steps: take chemically pure manganese sulfate and potassium permanganate respectively by the proportioning ratio of the amount of substance of 10:1, and dissolve respectively in high-purity water, add to sulfuric acid Add oleic acid accounting for 10% of the mass of manganese sulfate as an active agent in the manganese solution; drop potassium permanganate solution into the manganese sulfate solution at a rate of 60 drops / minute, stir mechanically to disperse, and react at 30°C for 48 hours. High-grade manganese dioxide is suspended in the solution, the solution is filtered, and the filtered precipitate is washed several times. During the washing process, polysorbate accounting for 10% of the product mass is added as a dispersant, filtered, and heated at 30±5°C and drying to obtain nano-manganese dioxide with uniform nanowire network structure.

[0035] An applicatio...

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Abstract

The invention provides a preparation method of nano-manganese oxide which is of a nanowire net structure. The preparation method comprises the following steps: dropwise adding an oxidant containing aqueous solution or feeding oxidizing gas into an active agent containing manganese salt aqueous solution, and uniformly dispersing; carrying out a liquid-phase co-precipitation reaction, so that nano-sized manganese dioxide is suspended in the solution; filtering the solution; and washing and drying the obtained precipitate subjected to filtering, so that the nano-manganese oxide is obtained. The nano-manganese oxide prepared by using the preparation method disclosed by the invention can be applied to the field of super capacitors and wastewater treatment. According to the invention, through elaborate design, the industrial process is maximally simplified, the quality of products is improved, and the production cycle is shortened, therefore, the method disclosed by the invention is a nano-manganese oxide preparation method which is simple in technological process, small in energy consumption, short in reaction period, good and stable in product quality and low in cost.

Description

technical field [0001] The invention relates to the preparation of nanometer materials, in particular to a method for preparing nanometer manganese dioxide by a low-temperature liquid-phase co-precipitation method and its application. Background technique [0002] Manganese dioxide is an amphoteric transition metal oxide and is the main component of pyrolusite. It is a black or brown powdery solid that is very stable at room temperature. As an important transition metal oxide, manganese dioxide has been widely used in many fields such as battery materials (such as supercapacitors) due to its good redox characteristics. [0003] In addition, with the increasingly serious environmental pollution, experts and scholars from various countries are working hard to develop green new materials and find new methods of pollution control. Due to the unique chemical composition and physical and chemical properties of manganese dioxide, it has begun to be used as a pollution control tool...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02B82Y30/00B82Y40/00
Inventor 蒋光辉陈海青刘俊牛莎莎
Owner HUNAN RES INST FOR NONFERROUS METALS
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