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Preparation method of Bi2O2SiO3/Bi2O3/BiOBr heterogeneous composite optical material

A composite optical and heterogeneous technology, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of insufficient response wavelength range and narrow bandgap width, and achieve improved photocatalysis Performance, mild reaction conditions, and short preparation cycle

Active Publication Date: 2019-09-20
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the single bismuth-based oxide semiconductors have too wide or too narrow bandgap, which makes their response wavelength range insufficient

Method used

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  • Preparation method of Bi2O2SiO3/Bi2O3/BiOBr heterogeneous composite optical material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A Bi 2 o 2 SiO 3 / Bi 2 o 3 The preparation method of / BiOBr heterogeneous composite material, comprises the steps:

[0027] (1) Mix absolute ethanol and deionized water into a beaker at a certain volume ratio, stir on a magnetic stirrer at a slow speed for 5-10 minutes, weigh citric acid into the beaker and stir until completely dissolved; The volume ratio is 1:1, and the concentration of citric acid is 0.5mol / L;

[0028] (2) Weigh a certain amount of bismuth nitrate and add it to the beaker, increase the speed, and stir the powder deposited on the bottom of the beaker with a glass rod every about 10 minutes, seal it with plastic wrap and stir until it is completely dissolved; the concentration of bismuth nitrate 0.2mol / L

[0029] (3) Add a certain amount of ethyl orthosilicate, polyethylene glycol, and sodium lauryl sulfate in turn as a dispersant, and stir until completely dissolved to obtain a precursor solution; the concentration of ethyl orthosilicate is 0.1mo...

Embodiment 2

[0035] A Bi 2 o 2 SiO 3 / Bi 2 o 3 / BiOBr heterogeneous composite optical material preparation method, comprises the steps:

[0036](1) Mix absolute ethanol and deionized water into a beaker at a certain volume ratio, stir on a magnetic stirrer at a slow speed for 5-10 minutes, weigh citric acid into the beaker and stir until completely dissolved; The volume ratio is 1:1.1, and the concentration of citric acid is 0.4mol / L;

[0037] (2) Weigh a certain amount of bismuth nitrate and add it to the beaker, increase the speed, and stir the powder deposited on the bottom of the beaker with a glass rod every about 10 minutes, seal it with plastic wrap and stir until it is completely dissolved; the concentration of bismuth nitrate 0.6mol / L

[0038] (3) Add a certain amount of ethyl orthosilicate, polyethylene glycol, and sodium orthophosphate successively as a dispersant, and stir until completely dissolved to obtain a precursor solution; the concentration of ethyl orthosilicate ...

Embodiment 3

[0045] A Bi 2 o 2 SiO 3 / Bi 2 o 3 / BiOBr heterogeneous composite optical material preparation method, comprises the steps:

[0046] (1) Mix absolute ethanol and deionized water into a beaker at a certain volume ratio, stir on a magnetic stirrer at a slow speed for 5-10 minutes, weigh citric acid into the beaker and stir until completely dissolved; The volume ratio is 1:1.2, and the concentration of citric acid is 0.3mol / L;

[0047] (2) Weigh a certain amount of bismuth nitrate and add it to the beaker, increase the speed, and stir the powder deposited on the bottom of the beaker with a glass rod every about 10 minutes, seal it with plastic wrap and stir until it is completely dissolved; the concentration of bismuth nitrate 0.8mol / L;

[0048] (3) Add a certain amount of ethyl orthosilicate and sodium lauryl sulfate successively as dispersants, and stir until completely dissolved to obtain a precursor solution; the concentration of ethyl orthosilicate is 0.4mol / L, and the ...

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Abstract

The invention discloses a preparation method of a Bi2O2SiO3 / Bi2O3 / BiOBr heterogeneous composite material. According to the method, bismuth nitrate is used as a bismuth source, tetraethoxysilane is used as a silicon source, sodium orthophosphate, lauryl sodium sulfate, polyethylene glycol and the like are added to promote formation of a required crystal phase, and a precursor is prepared to prepare the Bi2O2SiO3 / Bi2O3 / BiOBr heterogeneous composite material. The method is simple in process equipment, short in period and low in cost, and the obtained composite material powder has high photocatalytic performance.

Description

technical field [0001] The invention belongs to the technical field of photocatalysts, in particular to a Bi 2 o 2 SiO 3 / Bi 2 o 3 / BiOBr heterogeneous composite optical material preparation method. Background technique [0002] Bismuth silicate (BSO), as an important functional material, has special acousto-optic, photoelectric, piezoelectric, electrical conductivity and ferroelectric properties. Bi 2 o 2 SiO 3 Is a kind of Oliviers phase compound with layered structure, by [Bi 2 o 2 ] 2+ layer with SiO 3 2- Layers grow alternately along the c-axis direction to form a layered structure, and its anion oxyacid SiO 3 2- It shows good structural stability and crystallization properties, so Bi 2 o 2 SiO 3 It has good chemical stability, and it has good photoresponse to visible light. Most single bismuth-based oxide semiconductors have too wide or too narrow a bandgap, which makes their response wavelength range insufficient. If two or more semiconductors with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04B01J37/03B01J37/10B01J37/34C02F1/30C02F101/30C02F101/34C02F101/38
CPCB01J27/04B01J37/343B01J37/036B01J37/10C02F2101/34C02F2101/38C02F2305/10C02F2101/308B01J35/39
Inventor 伍媛婷韩琳曾柏林张新孟李旭
Owner SHAANXI UNIV OF SCI & TECH
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