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Preparation method of silicate double-layer hollow nanometer fiber with multistage structure

A hollow nano- and composite nano-fiber technology, applied in the chemical characteristics of fibers, chemical instruments and methods, silicon oxide, etc., can solve the problems of difficult separation, recovery and reuse, and limit practical applications, and achieve easy separation, recovery and reuse. The effect of strong controllability and wide application prospects

Inactive Publication Date: 2015-07-01
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When such single-layer silicate hollow spheres are used as adsorbents for treating pollutants or heavy metals in water, they are easily suspended in water and difficult to separate, recover and reuse, which greatly limits their practical applications.

Method used

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  • Preparation method of silicate double-layer hollow nanometer fiber with multistage structure
  • Preparation method of silicate double-layer hollow nanometer fiber with multistage structure
  • Preparation method of silicate double-layer hollow nanometer fiber with multistage structure

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Magnetically stir 1.6ml of tetraethyl orthosilicate and 10ml of absolute ethanol for 10 minutes; add 0.95g of polyvinylpyrrolidone (molecular weight: 90,000) to the above solution, stir magnetically at room temperature for 4 hours, and stand still for 2 hours to form Spinning solution; add the prepared spinning solution into the liquid storage tube of the spinning device for electrospinning, the nozzle diameter is 0.6 mm, adjust the inclination angle between the nozzle and the horizontal plane to 15 degrees, apply a DC voltage of 9.5 kV, and the curing distance 20 cm, to obtain composite nanofibers of tetraethyl orthosilicate / PVP; put the composite nanofibers into a temperature-programmed furnace for heat treatment, the heating rate is 0.5°C / min, keep the temperature at 550°C for 2 hours, and then With the natural cooling of the furnace body, the target product can be obtained. The product was identified as amorphous silica by X-ray powder diffraction and energy dispers...

Embodiment 2

[0029] At room temperature, dissolve 0.0002 moles of nickel acetate tetrahydrate into 10 ml of deionized water, and stir thoroughly for 5 minutes; add 0.2 ml of concentrated ammonia water and 0.002 moles of ammonium chloride to the mixed solution in turn, and continue stirring for 5 minutes; mix the above The solution was transferred to a polytetrafluoroethylene-lined stainless steel reactor; then 0.02 g of silica hollow nanofibers were added to the reactor, and the reactor was sealed and placed in an oven for hydrothermal reaction at 100° C. for 10 hours. After naturally cooling to room temperature, it was alternately washed several times with deionized water and absolute ethanol, and the mixture was centrifuged to obtain the target product. The product is identified as nickel silicate by X-ray powder diffraction and energy dispersive X-ray spectroscopy. It can be proved by scanning electron microscopy that nickel silicate nanofibers have a multi-level structure. The fiber wal...

Embodiment 3

[0031] At room temperature, 0.0002 moles of copper acetate monohydrate were dissolved in 10 milliliters of deionized water and stirred for 5 minutes; 0.2 milliliters of concentrated ammonia water and 0.002 moles of ammonium chloride were added to the mixed solution successively and continued to stir for 5 minutes; The above mixed solution was transferred to a polytetrafluoroethylene-lined stainless steel reaction kettle; then 0.02 grams of silica hollow nanofibers were added to the reaction kettle, and the reaction kettle was sealed and placed in an oven for hydrothermal reaction at 140°C for 10 Hour. After naturally cooling to room temperature, it was alternately washed several times with deionized water and absolute ethanol, and the mixture was centrifuged to obtain the target product. The product is identified as copper silicate by X-ray powder diffraction and energy dispersive X-ray spectroscopy. Scanning electron microscopy can prove that copper silicate nanofibers have a...

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Abstract

The invention relates to a preparation method of a silicate double-layer hollow nanometer fiber with a multistage structure. The preparation method belongs to an inorganic chemical synthesis method. The preparation method comprises that acetate as a raw material, ammonium hydroxide as a complexing agent, ammonium chloride as a mineralizer and silica hollow nanometer fibers as sacrifice templates undergo a hydro-thermal reaction at a certain temperature in an enclosed reactor to produce the silicate double-layer hollow nanometer fibers with multistage structures. The silicate double-layer hollow nanometer fiber has the diameter of 300-600 nanometers. The silicate double-layer hollow nanometer fiber has a large specific surface area, can be precipitated easily and is convenient for separation from a solution, recovery and recycle. The preparation method has simple and reliable processes, has high controllability, adopts cheap and easily available raw materials, has universality and lays the foundation of wide application of silicate.

Description

technical field [0001] The invention belongs to an inorganic chemical synthesis method, in particular to the preparation of a silicate double-layer hollow nanofiber with a multi-level structure. Background technique [0002] Silicate is widely used in adsorption, catalyst carrier, drug controlled release, lithium battery, etc. Applications. In recent years, various nanomaterials with special structures and special morphologies, especially multilayer hollow micro / nanomaterials, have attracted extensive attention. Materials with this type of structure have the characteristics of low density, high specific surface area, and excellent stability, and their hollow parts can accommodate a large number of guest molecules or large-sized guests, which can produce some peculiar properties based on the microscopic "wrapping" effect. The multilayer hollow micro / nano materials have important applications in many technical fields such as medicine, lithium battery, catalysis and pollutant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/10C01B33/12C01B33/20
Inventor 邢艳金仁喜杨阳
Owner NORTHEAST NORMAL UNIVERSITY
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