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A kind of preparation method of high-purity cubic sodium niobate nanopowder

A technology of phase sodium niobate and nanopowder, which is applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., and can solve the problems of complex preparation process of cubic phase sodium niobate nanostructure, unfavorable large-scale production, unfavorable application, etc. , to achieve the effects of economical toxicity, sensitive response to visible light, and low toxicity

Inactive Publication Date: 2015-12-02
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[See: Peng Li, Shuxin Ouyang, Guangcheng Xietal., The Effects of Crystal Structure and Electronic Structure on Photocatalytic H 2 Evolution and CO 2 Reduction over Two Phases of Perovskite-Structured NaNbO 3 , J.Phys.Chem.C2012,116(14):7621~7628.] The preparation process of the above-mentioned cubic phase sodium niobate nanostructure is complex and costly, which is not conducive to large-scale production, nor is it conducive to its application in photocatalysts, Applications in dye-sensitized solar cells and gas sensors

Method used

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  • A kind of preparation method of high-purity cubic sodium niobate nanopowder
  • A kind of preparation method of high-purity cubic sodium niobate nanopowder
  • A kind of preparation method of high-purity cubic sodium niobate nanopowder

Examples

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Effect test

Embodiment 1

[0021] A method for preparing high-purity cubic phase sodium niobate nano powder, the steps are:

[0022] (1) Dissolve niobium oxalate and sodium chloride in 3 or 4 or 6 or 7 ml of deionized water according to the molar ratio of 0.06 or 0.11 or 0.13 or 0.15 or 0.18 or 0.20 or 0.24 or 0.25;

[0023] (2) Grind in an agate mortar for 30 or 35 or 40 or 45 or 50 minutes, and add 5 or 6 or 7 or 8 or 10 ml of absolute ethanol during the grinding process;

[0024] (3) Put the precursor obtained in step (2) in a vacuum drying oven at a vacuum degree of -50 or -60 or -70 or -80 or -90 or -100 kPa and a temperature of 60 or 65 or 70 or Drying at 76 or 80 or 85 or 90 degrees Celsius;

[0025] (4) Heat the dried precursor powder to 350 or 380 or 400 or 420 or 430 or 450 or 480 or 500 degrees Celsius in an energy-saving box-type electric furnace, keep it for 2 or 3 or 4 or 5 hours, and then cool naturally To 20 or 22 or 24 or 25 degrees Celsius;

[0026] (5) Centrifugally wash the powder obtained i...

Embodiment 2

[0033] A method for preparing high-purity cubic phase sodium niobate nano powder, the steps are:

[0034] (1) Dissolve niobium oxalate and sodium chloride in 2 or 3 or 4 milliliters of deionized water at a molar ratio of 0.08;

[0035] (2) Grind in an agate mortar for 38 minutes, and add 3 or 5 or 9 ml of absolute ethanol during the grinding process;

[0036] (3) Put the precursor obtained in step (2) in a vacuum drying oven at a vacuum degree of -50 or -55 or -62 or -68 or -74 or -78 or -86 or -92 or -100 kPa , Drying at a temperature of 60 or 66 or 72 or 78 or 84 or 90 degrees Celsius;

[0037] (4) Heat the dried precursor powder to 410 degrees Celsius in an energy-saving box-type electric furnace, keep it for 2 hours, and then naturally cool to 20-25 degrees Celsius;

[0038] (5) Centrifugally wash the powder obtained in step (4) with a mixed solution of deionized water and absolute ethanol for 3 times, the volume ratio of deionized water and absolute ethanol is 1:2, and the centrif...

Embodiment 3

[0044] A method for preparing high-purity cubic phase sodium niobate nano powder, the steps are:

[0045] (1) Dissolve niobium oxalate and sodium chloride in 3 or 4 or 5 milliliters of deionized water at a molar ratio of 0.07;

[0046] (2) Grind in an agate mortar for 36 minutes, and add 4 or 5 or 7 ml of absolute ethanol during the grinding process;

[0047] (3) Put the precursor obtained in step (2) in a vacuum drying oven at a vacuum degree of -50 or -61 or -71 or -81 or -90 or -100 kPa and a temperature of 60 or 68 or 76 or Drying at 85 or 90 degrees Celsius;

[0048] (4) Heat the dried precursor powder to a temperature of 440 degrees Celsius in an energy-saving box-type electric furnace, keep it for 2 hours, and then naturally cool it to 20-25 degrees Celsius;

[0049] (5) Centrifugally wash the powder obtained in step (4) with a mixed solution of deionized water and absolute ethanol for 3 times, the volume ratio of deionized water and absolute ethanol is 1:3, and the centrifugal ...

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Abstract

The invention discloses a preparation method of high-purity cubic phase sodium niobate nano powder, which comprises the following steps: proportioning niobium oxalate or niobium ammonium oxalate and sodium chloride according to the mole ratio, and dissolving in deionized water; (2) grinding in an agate mortar while dropwisely adding anhydrous ethanol; (3) drying the obtained precursor in a vacuum drying oven; (4) heating the dried precursor powder in an energy-saving box furnace, keeping the temperature, and naturally cooling to room temperature; (5) carrying out centrifuge washing on the obtained powder with a deionized water-anhydrous ethanol mixed solution; and (6) drying the obtained powder in a vacuum drying oven to obtain the cubic phase sodium niobate nano powder. The method solves the problem of difficulty in preparing cubic phase sodium niobate; the preparation technique has the advantages of short time consumption and low energy consumption, and is suitable for large-scale production; and the prepared cubic phase sodium niobate nano powder has the advantages of high adsorption capacity, high response sensitivity to visible light, high photocatalytic efficiency and the like.

Description

Technical field [0001] The invention belongs to the technical field of inorganic nano-functional materials (preparation of nano-powders in materials science), and relates to sodium niobate nano-powders that can be used in the fields of non-linear optical devices, photocatalysis, and solar cells. A method for preparing pure cubic phase sodium niobate nano powder with well-developed crystal form. Background technique [0002] Sodium niobate is a perovskite structure material with low toxicity and high stability. Due to its good nonlinear optical response, piezoelectric properties and photorefractive properties, it is used in the fields of nonlinear optics, optoelectronics and photocatalysis. Prospects for a wide range of applications. Sodium niobate crystal has many crystal phases, mainly orthorhombic phase, tetragonal phase, cubic phase and rhombohedral phase, and these crystal phases can undergo phase change at a certain temperature, and the orthorhombic phase is the most stable...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G33/00B82Y30/00
CPCY02P20/10
Inventor 李岳彬王林张溢田轶群顾豪爽
Owner HUBEI UNIV
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