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Controlled synthesizing method for nano-manganese oxide with different shapes and sizes
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A nano-manganese dioxide and synthesis method technology, applied in the direction of manganese oxide/manganese hydroxide, nanotechnology, etc., can solve the problems of long reaction time, cumbersome preparation process, and easy decomposition of materials, and achieve cheap and safe materials and preparation conditions Simplicity and the effect of reducing production costs
Active Publication Date: 2018-04-20
GUANGDONG MEDICAL UNIV
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[0004] Nano-MnO prepared by the method reported so far 2 Large particle size (above 500nm), which limits the size of nano-MnO 2 In terms of batteries, especially in the application of lithium-ion batteries; some methods have expensive raw materials or toxic compounds, and do not use the actual operation of industrial production; some methods have strong acid solutions, which are highly corrosive and require high reaction equipment. , it is difficult to order equipment, and it is not easy to carry out production; some methods have a long reaction time and low production efficiency, and because they are in a state of high temperature and high pressure for a long time, the material is easy to decompose and the product shape is easy to change, so that the reaction yield is low and the product The quality is poor, and it is difficult to carry out industrial production; some methods are more complicated, and it is difficult to popularize and apply
All in all, since the preparation of nano-manganese dioxide has to overcome several difficulties such as cumbersome preparation process, uneasy control of product morphology and poor product performance, so far, there has not been found a combination of simple process, easy-to-control morphology and excellent product performance at home and abroad. Preparation method for industrialized production of nano manganese dioxide
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Embodiment 1
[0046] Embodiment 1 A kind of manganese dioxide nano flower
[0047] 1. Preparation method
[0048] A kind of nanometer manganese dioxide is prepared by the following steps:
[0049] (1) 7.9071g of KMnO 4 Dilute in 200mL deionized water, stir, and prepare KMnO with a concentration of 0.25mol / L 4 solution; add 3.5 mL of H 3 PO 4 solution (mass fraction is 85%, density is 1.69g / mL), the two are mixed evenly, and the final preparation volume is the reaction solution of 65mL; Wherein, KMnO 4 with H 3 PO 4 The molar ratio is 1:1;
[0050] (2) Transfer 65mL of the reaction solution to a 100mL polytetrafluoroethylene reactor, and react at 160°C for 90min;
[0051] (3) Cool naturally, open the reaction kettle, remove the supernatant, add deionized water to wash 2 to 3 times, and then wash 2 to 3 times with anhydrousethanol solution, dry in a blast drying oven at 60°C until there is no supernatant solution, and then transferred to 80°C for 8 hours in vacuum to obtain monodi...
Embodiment 2
[0054] Embodiment 2 A kind of manganese dioxide nano flower
[0055] 1. Preparation method
[0056] Other conditions are identical with embodiment 1, difference is:
[0057] control KMnO 4 with H 3 PO 4 The molar ratio is 1:0.5; the reaction solution is reacted at 160° C. for 60 minutes.
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Abstract
The invention discloses a controlled synthesizing method for nano-manganeseoxide with different shapes and sizes. By taking phosphoric acid as a shape and size regulator, the phosphoric acid is reacted with a permanganateaqueous solution to synthesize nano-manganeseoxide, wherein the molar ratio of permanganate and phosphoric acid is 1: (0.5-16). The method is of relatively high controllability, and can control shapes of nano-manganeseoxide directionally to obtain flower-like and rod-like nano-manganese oxide with uniform shapes, separately. Meanwhile, the raw materials are cheaper and safer, and are unlikely to corrode equipment; the diameter of the synthesized nano-manganese oxide flower is smaller than 400nm, and the minimum diameter reaches 50nm; the diameter of the synthesized nano-manganese oxide rod is 18.9-28.8nm, and the length is 283-425nm; and the prepared product is higher in specific surface area and higher in adsorption capacity. The synthesizing method has the advantages of being simple in process, cheap and easy for scaled production and the like.
Description
technical field [0001] The invention belongs to the technical field of inorganic chemical industry. More specifically, it relates to a controlled synthesis method of nano manganese dioxide with different shapes and sizes. Background technique [0002] Manganese dioxide (MnO 2 ) as an important functional inorganic material has aroused great interest among researchers due to its abundant source, low price and environmental friendliness. Due to its unique physical and chemical properties, it has been widely used in catalysts, adsorption and electrochemical supercapacitors. As a battery material, the performance of manganese dioxide is relatively poor compared with noble metal oxides. Manganese dioxide has attracted extensive attention as an electrode material for ion batteries and supercapacitors due to its good Faraday effect. [0003] At present, the methods for synthesizing manganese dioxide nanoparticles mainly include redox method and thermal decomposition method. Pat...
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