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Preparation method of highly dispersed regular hexagonal layered manganese oxide nanosheets

A hexagonal, highly dispersed technology for materials applications

Inactive Publication Date: 2015-08-19
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The morphology of layered manganese oxide includes nanowires, nanobelts, nanosheets, nanowalls, nanoflower balls, and hexagonal prisms, while for layered manganese oxide nanosheets with regular morphology and highly dispersed The development and preparation of MnO have not been reported so far, and there is an urgent need for a method for preparing regular and highly dispersed layered manganese oxide nanosheets with low cost, simple operation, and strong shape controllability.

Method used

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  • Preparation method of highly dispersed regular hexagonal layered manganese oxide nanosheets
  • Preparation method of highly dispersed regular hexagonal layered manganese oxide nanosheets
  • Preparation method of highly dispersed regular hexagonal layered manganese oxide nanosheets

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Embodiment 1

[0030] 1. Preparation of Mn(OH) 2

[0031] 0.3160g KMnO 4 Dissolve in 40mL deionized water, then slowly add 5mL hydrazine hydrate aqueous solution with a mass fraction of 50%, stir for 10 minutes, KMnO 4 The molar ratio to hydrazine hydrate was 1:40, and the resulting mixture was transferred to a 60mL polytetrafluoroethylene-lined stainless steel reactor, treated with hydrothermal treatment at 180°C for 12 hours, and the reactor was naturally cooled to room temperature, filtered to obtain a white product, and deionized After washing with water until neutral, place it in a vacuum drying oven at 60°C for 10 minutes in vacuum to obtain the hexagonal Mn(OH) 2 .

[0032] 2. Preparation of highly dispersed regular hexagonal layered manganese oxide nanosheets

[0033] Get 0.1700g (1.91mmol) of new hexagonal Mn(OH) 2 Dispersed in 120mL280mmol / L NaClO aqueous solution, Mn(OH) 2 The molar ratio to NaClO was 1:17.6. After ultrasonic dispersion for 5 minutes, the resulting suspensio...

Embodiment 2

[0035] This embodiment prepares Mn(OH) 2 Step 1 is the same as in Example 1. In step 2 of embodiment 1, get 0.1700g (1.91mmol) newly made hexagonal Mn(OH) 2 Dispersed in 120mL280mmol / L NaClO aqueous solution, Mn(OH) 2 The molar ratio to NaClO was 1:17.6. After ultrasonic dispersion for 5 minutes, the resulting suspension was stirred at room temperature for 3 hours. The resulting precipitate was filtered and washed with deionized water until neutral, and placed in a vacuum oven at 60°C for 2 hours in vacuum. , to obtain highly dispersed regular hexagonal layered manganese oxide nanosheets.

Embodiment 3

[0037] This embodiment prepares Mn(OH) 2 Step 1 is the same as in Example 1. In step 2 of embodiment 1, get 0.1700g (1.91mmol) newly made hexagonal Mn(OH) 2 Dispersed in 120mL280mmol / L NaClO aqueous solution, Mn(OH) 2 The molar ratio to NaClO was 1:17.6. After ultrasonic dispersion for 5 minutes, the resulting suspension was stirred at room temperature for 48 hours. The resulting precipitate was filtered and washed with deionized water until neutral, and placed in a vacuum drying oven at 60°C for 2 hours under vacuum. , to obtain highly dispersed regular hexagonal layered manganese oxide nanosheets.

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Abstract

The invention discloses a preparation method of a high-dispersion regular hexagonal layered manganese oxide nanosheet. The preparation method comprises the steps: topologically oxidizing a regular hexagonal Mn(OH)2 precursor in a NaClO aqueous solution to maintain the layered structure and hexagonal appearance of the precursor Mn(OH)2, and thus preparing the high-dispersion regular hexagonal layered manganese oxide nanosheet. The method is simple in operation, and the representation by utilizing an X-ray diffraction instrument, a field emission scanning electronic microscope, a transmission electronic microscope, an X-ray photo-electron spectrometer and a thermogravimetric difference analyzer shows that the appearance of the prepared hexagonal layered manganese oxide nanosheet is regular, the crystallization is high, the particles are uniformly distributed, the dispersion property is good, the particle size is about 200nm, and the thickness of the nano-sheet layer is about 120nm.

Description

technical field [0001] The invention belongs to the technical field of materials, and specifically relates to a new technology for preparing hexagonal layered manganese oxide nanosheets with regular morphology, high crystallinity and good dispersibility by using a topological oxidation method. Background technique [0002] As an important inorganic functional material, manganese oxide has a wide range of applications in the fields of catalysis, ion exchange, selective adsorption, biosensors, lithium-ion secondary batteries and supercapacitors due to its special physical and chemical properties. prospect. Birnessite-type layered manganese oxide is composed of the basic structural unit MnO 6 The octahedron is connected by sharing edges, and there are water molecules and exchangeable cations such as Na + and K+, forming a layered manganese oxide with a layer spacing of about 0.69-0.71nm. Because part of the manganese (III) replaces the position of the manganese (IV) atom, or...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/02B82Y30/00B82Y40/00
Inventor 刘宗怀王建芳
Owner SHAANXI NORMAL UNIV