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Preparation method and application of crystalline-state beta-MnOOH nanowire

A nanowire and crystalline technology, which is applied in the field of preparation of β-MnOOH nanowires, can solve the problems of not being very environmentally friendly, and the specific surface area of ​​nanostructures is small, and achieve the effects of low cost, good crystallization performance, and simple process

Inactive Publication Date: 2011-05-04
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods are energy-consuming or not very environmentally friendly.
Moreover, the specific surface area of ​​the obtained nanostructures is usually relatively small.

Method used

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  • Preparation method and application of crystalline-state beta-MnOOH nanowire

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Preparation and characterization of β-MnOOH nanowires: 10 ml of 0.8 mM ethanolamine (NH 2 CH 2 CH 2 OH) solution was quickly added to 0.4 mM manganous nitrate (Mn(NO) 3 ) aqueous solution, after 1 minute, slow down the stirring speed, and seal the reaction vessel. After one day, brown flocculent precipitate can be obtained, and XRD proves that this precipitate has β-MnOOH crystal structure (see figure 1 ). SEM morphology analysis shows that these precipitates are nanowires with an average diameter of 25 nm and a length of about 1 micron. High-magnification SEM shows that these nanowires are bundled structures formed by parallel arrangement of thinner 3-5 nm nanowires (see figure 1 ). BET tests show that these nanowires have a specific surface area as high as 104 m 2 / g.

Embodiment 2

[0030] Preparation and characterization of β-MnOOH nanowires: Add 10 ml of 0.8 mM NaOH aqueous solution to 0.4 mM manganous nitrate (Mn(NO) 3 ) aqueous solution, after 1 minute, slow down the stirring speed, and seal the reaction vessel. After one day, a brown flocculent precipitate can be obtained, and XRD proves that the precipitate has a β-MnOOH crystal structure. SEM morphology analysis shows that these precipitates are nanowires with an average diameter of 25 nanometers and a length of about 1 micron. High-magnification SEM shows that these nanowires are bundled structures formed by parallel arrangement of thinner nanowires of 3-5 nanometers.

Embodiment 3

[0032] Preparation and characterization of β-MnOOH nanowires: Add 10 ml of 1.0 mM NaOH aqueous solution to 0.6 mM manganous chloride (Mn(NO) 3 ) aqueous solution, after 1 minute, slow down the stirring speed, and seal the reaction vessel. After two days, a brown flocculent precipitate can be obtained, and XRD proves that the precipitate has a β-MnOOH crystal structure. SEM morphology analysis shows that these precipitates are nanowires with an average diameter of 25 nanometers and a length of about 1 micron. High-magnification SEM shows that these nanowires are bundled structures formed by parallel arrangement of thinner nanowires of 3-5 nanometers.

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Abstract

The invention discloses a preparation method and application of a crystalline-state beta-MnOOH nanowire. The preparation method of the crystalline-state beta-MnOOH nanowire comprises the following steps of: mixing 0.4-0.6 mM of manganous saline solution with 0.8-1.0 mM of aqueous alkali, which have same volumes, under magnetic stirring at normal temperature; and standing for 1-2 days to generate crystalline-state beta-MnOOH nanowire precipitates, wherein the crystalline-state beta-MnOOH nanowire is used for preparing a mesoporous separation membrane with the thickness of 120-600 nanometers and has a very good beta-MnOOH crystalline structure and a mean diameter of 25 nanometers; easily carrying out ultrasonic dispersion for 5-10 minutes, filtering 2-10 ml of dispersion liquid on a porous substrate to form a mesoporous membrane with the thickness of 120-600 nanometers, wherein the mesoporous membrane can effectively separate granules of 10 nanometers from a water solution, and the flow velocity reaches up to 15,120 L / m<2>hbar; annealing the crystalline-state beta-MnOOH nanowire in the air at 350-450 DEG C for 1 hour, and then converting into a trimanganese tetroxide nanowire with high specific surface area of 70 m<2> / g, which is used for catalyzing and degrading dye molecules.

Description

technical field [0001] The invention relates to a preparation method and application of crystalline β-MnOOH nanowires. Background technique [0002] Manganese oxides and their nanostructures have been widely used in catalysis, batteries and other fields. They are usually prepared by several methods: hydrothermal redox method, sol-gel method in organic solvent, salt melting method, etc. These methods are energy-consuming or not very environmentally friendly. Moreover, the specific surface area of ​​the obtained nanostructures is usually relatively small. The invention mainly introduces an environment-friendly method for preparing β-MnOOH nanowires with high specific surface area. This simple synthesis method in aqueous solution at normal temperature can meet the requirements of industrialized large-scale production, and is energy-saving, economical and environmentally friendly. And further expand the application of this nanowire to the separation membrane and catalytic ox...

Claims

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Application Information

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IPC IPC(8): C30B29/16C30B29/62C30B7/14C01G45/02B01D71/02B01J23/34B01J35/06B01J37/03C02F1/72
Inventor 彭新生于卿黄宏文叶志镇
Owner ZHEJIANG UNIV
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