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Method for preparing manganese dioxide nano-material with high ammonia gas specific response

A nano-manganese dioxide, specific technology, applied in manganese oxide/manganese hydroxide, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of harsh reaction conditions and large impact, and achieve mild conditions , broad development prospects and application space, and the effect of product shape stability

Inactive Publication Date: 2015-07-29
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since this patent uses the W / O emulsion template method, the reaction conditions are relatively harsh and are greatly affected by the external environment.

Method used

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  • Method for preparing manganese dioxide nano-material with high ammonia gas specific response
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  • Method for preparing manganese dioxide nano-material with high ammonia gas specific response

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Experimental program
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Effect test

Embodiment

[0036] A method for preparing a nano-manganese dioxide material with a specific response to ammonia, the specific steps are as follows:

[0037] (1) Solution configuration: use deionized water as solvent, prepare 0.01mol / L potassium permanganate solution and 0.015mol / L sodium sulfite solution 8ml each, and mix them.

[0038] (2) Synthesis of rod-shaped manganese dioxide nanomaterials:

[0039] Put the potassium permanganate solution and the sodium sulfite solution into a 20ml reaction kettle, add 0.01g of polyvinylpyrrolidone (PVP) as a surfactant, and mix them uniformly by ultrasonication for 5 minutes. Put it into an oven and keep it warm at 180° C. for 4 hours to obtain a nano-manganese dioxide material with specific response to ammonia.

[0040] figure 1 Obtain the SEM photo of the product for the product at a multiple of 5um; figure 2 The SEM photo of the product was obtained at a multiple of 10um. From the above picture, we can see that the cross-sectional diameter o...

Embodiment 2

[0043] A method for preparing a nano-manganese dioxide material with specific response to ammonia, comprising the following steps:

[0044] (1) Configuration of the solution: use deionized water as a solvent, configure a potassium permanganate solution with a concentration of 0.01mol / L and a sodium sulfite solution with a concentration of 0.01mol / L, and mix them in the same volume;

[0045] (2) Synthesis of rod-shaped manganese dioxide nanomaterials: put potassium permanganate solution and sodium sulfite solution into the reactor, add polyvinylpyrrolidone (PVP) as surfactant, surfactant polyvinylpyrrolidone The mass ratio of ketone to potassium permanganate solution is 1:1. Ultrasound for 15 minutes to make it evenly mixed, put it in an oven, and keep it warm at 160°C for 5 hours. After the reaction is over, cool it to room temperature, centrifuge the sample, and wash it. , dry, and collect the product to obtain a nano manganese dioxide material with specific response to ammonia...

Embodiment 3

[0047] A method for preparing a nano-manganese dioxide material with specific response to ammonia, comprising the following steps:

[0048] (1) Configuration of the solution: with deionized water as a solvent, configure a potassium permanganate solution with a concentration of 0.02mol / L and a sodium sulfite solution with a concentration of 0.02mol / L, and mix them in the same volume;

[0049] (2) Synthesis of rod-shaped manganese dioxide nanomaterials: put potassium permanganate solution and sodium sulfite solution into the reactor, add polyvinylpyrrolidone (PVP) as surfactant, surfactant polyvinylpyrrolidone The mass ratio of ketone to potassium permanganate solution is 1:2, ultrasonically mix it for 30 minutes, put it in an oven, and keep it warm at 200°C for 3 hours, after the reaction is over, cool to room temperature, centrifuge and wash the sample , dry, and collect the product to obtain a nano manganese dioxide material with specific response to ammonia.

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Abstract

The invention relates to a method for preparing a manganese dioxide nano-material with high ammonia gas specific response. The method comprises the following steps: (1) preparation of solutions: preparing a potassium permanganate solution and a sodium sulfite solution; (2) synthesis of a rodlike manganese dioxide nano-composite material: putting the potassium permanganate solution and the sodium sulfite solution into a reaction kettle, adding polyvinylpyrrolidone into the reaction kettle to serve as a surfactant, carrying out mixing with ultrasonic sound till the obtained mixture is uniform, putting the reaction kettle into an oven, keeping the temperature at a specific value for a certain time, cooling to the room temperature after reaction is finished, centrifuging a sample, carrying out washing and drying, and collecting the product which is the manganese dioxide nano-material with high ammonia gas specific response. Compared with the prior art, the rodlike manganese dioxide nano-composite material is synthesized according to the hydrothermal method, so that the appearance of the product can be controlled. Moreover, the manganese dioxide nano-material has high NH3 specific response, thereby being capable of detecting gas existence under the condition that the gas concentration is very low.

Description

technical field [0001] The invention relates to a preparation method of a manganese dioxide material, in particular to a preparation method of a nano manganese dioxide material which has a specific response to ammonia. Background technique [0002] With the rapid development of human material civilization, people's living standards are also improving day by day. But at the same time, it has also brought very serious pollution to the earth. Air pollution and water pollution are the most harmful ones. In addition, many people die every year due to accidents such as coal mine explosions and gas poisoning. If the existence of these gases can be detected in time and an alarm is issued, the number of casualties will be greatly reduced. In the past, the detection methods for toxic and harmful gases and liquids included infrared absorption method, electrochemical analysis method, etc., but these methods have slow detection speed, complicated equipment and high cost. At this time, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02B82Y30/00B82Y40/00
Inventor 陈云吴庆生王浩
Owner TONGJI UNIV
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