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Layered mesoporous birnessite manganese dioxide cellular nano ball, preparing method and use of the same

A birnessite and honeycomb technology is applied in the field of layered mesoporous birnessite-type MnO2 honeycomb nanospheres and their preparation, and achieves the effects of high structural stability, simple preparation process and low cost

Inactive Publication Date: 2008-04-02
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, no Bir-type manganese oxides with controllable morphology have been prepared by redox at room temperature and neutral conditions.

Method used

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  • Layered mesoporous birnessite manganese dioxide cellular nano ball, preparing method and use of the same
  • Layered mesoporous birnessite manganese dioxide cellular nano ball, preparing method and use of the same
  • Layered mesoporous birnessite manganese dioxide cellular nano ball, preparing method and use of the same

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Take a certain amount of potassium permanganate with a purity of not less than 99.5% and dissolve it in 40-60 mL of distilled water, stir at room temperature for 15-30 minutes, and add 1 mL of oleic acid dropwise (the density of oleic acid is 0.891-0.899 g / mL, and the saponification value is not less than 3. The acid value is 190-200), the molar ratio of potassium permanganate / oleic acid is 1 / 10-3 / 10, and the stirring reaction is continued for not less than 5 hours. After reacting for a certain period of time until solid precipitates appear, separate at 4000 rpm for 10 to 15 minutes, then wash the sample with distilled water and ethanol, and repeat 3 to 5 times. The final sample was vacuum-dried at 50-70 degrees Celsius for more than 10 hours, and the obtained dark brown layered mesoporous birnessite-type MnO 2 The honeycomb nanospheres are shown in Figures 1a and 1b. Take a small amount of dried sample and redisperse it in ethanol, ultrasonically disperse it under 120...

Embodiment 2

[0035] Prepare layered mesoporous birnessite type MnO according to the method of Example 1 2 Honeycomb hollow nanosphere structure. Take a certain amount of potassium permanganate with a purity of not less than 99.5% and dissolve it in 40-60 mL of distilled water, stir at room temperature for 15-30 minutes, and add 1 mL of oleic acid dropwise (the density of oleic acid is 0.891-0.899 g / mL, and the saponification value is not less than 3. The acid value is 190-200), the molar ratio of potassium permanganate / oleic acid is 1-2, and the stirring reaction is continued for not less than 5 hours. After reacting for a certain period of time, separate at 4000 r / min for 10-15 minutes, then wash the sample with distilled water and ethanol, and repeat 3-5 times. The final prepared samples were dispersed and dried in vacuum at 50-70 degrees Celsius for more than 10 hours, and the obtained dark brown layered mesoporous birnessite-type MnO 2 The honeycomb hollow nanospheres are shown in Fi...

Embodiment 3

[0038] Get the layered mesoporous birnessite type MnO obtained in embodiment 1 and 2 2 Honeycomb nanospheres and honeycomb hollow nanospheres were degassed at 150 degrees Celsius, and their nitrogen adsorption at -196 degrees Celsius was measured on a nitrogen adsorption-desorption analyzer (Quantachrome NOVA 4200e, Quanta, USA) properties, the experimental results are shown in the curve in Figure 3, which shows that the obtained layered mesoporous birnessite-type MnO 2 Honeycomb nanospheres and honeycomb hollow nanospheres have good gas adsorption properties. Figure 3a shows layered mesoporous birnessite-type MnO 2 Nitrogen adsorption-desorption isotherms and pore size distribution curves of honeycomb nanospheres; Figure 3b shows the layered mesoporous birnessite-type MnO 2 Nitrogen adsorption-desorption isotherms and pore size distribution curves of honeycomb hollow nanospheres. The isotherm has a hysteresis loop, indicating that the as-prepared layered mesoporous birness...

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Abstract

The present invention belongs to the technology field of nanometer material preparing, in particular to a preparing method of layered meso porous water natrium manganese mine type MnO2 alveolate nanometer sphere and hollow nanometer sphere. The present invention takes cheap potassium permanganate and oleic acid as reactant. Acid or alkali processing is not needed. A redox takes place in a neutral aqueous solution. Through controlling a molar ratio of potassium permanganate and oleic acid, monodisperse layered meso porous water natrium manganese mine type MnO2 alveolate nanometer sphere and hollow nanometer sphere can be respectively obtained. The present invention does not need surfactant, is simple in process, low in cost and mild in reaction condition. The layered meso porous water natrium manganese mine type MnO2 alveolate nanometer sphere and hollow nanometer sphere of the present invention are rich in meso porous, big in specific surface area and hole capacity and good in structure stability, which can be used as vector of activator or sorbent. The present invention can also be used as separation material, magnetic material, battery electrode material, oxidative degradation material, desulfurization material or air purification material.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, in particular to a layered mesoporous birnessite-type MnO 2 Honeycomb nanosphere and its preparation method and use. Background technique [0002] Birnessite (hereinafter referred to as Bir) type manganese oxide (also known as birnessite, Na 4 mn 14 o 27 9H 2 O), which widely exists in soil and sediments in nature, is a kind of two-dimensional layered manganese oxide with a layer spacing of about 0.7nm (Y.Ma, J.Luo, S.L.Suib, Chem.Mater.1999, 11 , 1972; Q.Feng, H.Kanoh, K.Ooi, J.Mater.Chem.1999, 9, 319; Z.H.Liu, K.Ooi, H.Kanoh, W.P.Tang, T.Tomoda, Langmuir 2000, 16, 4154). Its sheets are composed of manganese oxide octahedral MnO 6 It is composed of common edges, and the interlayer is filled by water molecules and metal ions. Every 6 manganese oxide octahedral MnO on the layer structure 6 There is only one vacancy, which makes the entire octahedral layer negatively charg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02
Inventor 贺军辉陈洪敏
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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