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Bismuth/bismuth vanadate composite photocatalyst and preparation method and application thereof to photocatalytic degradation of organics

A technology of bismuth vanadate and compound light, which is applied in the field of photocatalysis, can solve the problem of low quantum yield and achieve high photocatalytic activity, high utilization rate of visible light, and uniform distribution

Inactive Publication Date: 2017-05-31
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the technical defects such as electron-hole pairs being easy to recombine in bismuth vanadate photocatalytic materials in the prior art, resulting in low quantum yield, the purpose of the present invention is to provide a light absorption range, high utilization rate of visible light, and photocatalytic activity. High bismuth / bismuth vanadate composite photocatalyst

Method used

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  • Bismuth/bismuth vanadate composite photocatalyst and preparation method and application thereof to photocatalytic degradation of organics
  • Bismuth/bismuth vanadate composite photocatalyst and preparation method and application thereof to photocatalytic degradation of organics
  • Bismuth/bismuth vanadate composite photocatalyst and preparation method and application thereof to photocatalytic degradation of organics

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Preparation of bismuth vanadate precursor: take 1mmol (0.4851g) Bi(NO 3 ) 3 ·5H 2 Dissolve O crystals in 45mL of ethylene glycol solution, stir to make it completely dissolve, and form a transparent solution, which is recorded as A solution; take 1.5mmol (0.1829g) NaVO 3 Dissolve the powder in 27mL of distilled water, stir to dissolve it completely, form a transparent solution, and record it as B solution; add B solution dropwise into A solution to obtain an orange-yellow solution, when B solution is completely added into A solution, record it as B solution. It is solution C; after stirring solution C for ten minutes, transfer it to a 100mL autoclave, place the autoclave in an oven at 180°C, and react for 10h. The synthesized yellow bismuth vanadate sample was washed alternately with ethanol and water, and dried in a vacuum oven at 50°C for 6 hours.

Embodiment 2

[0048] Preparation of bismuth vanadate precursor: take 1mmol (0.4851g) Bi(NO 3 ) 3 ·5H 2 Dissolve O crystals in 45mL of ethylene glycol solution, stir to make it completely dissolve, and form a transparent solution, which is recorded as A solution; take 1.8mmol (0.2195g) NaVO 3 Dissolve the powder in 27mL of distilled water, stir to dissolve it completely, form a transparent solution, and record it as B solution; add B solution dropwise into A solution to obtain an orange-yellow solution, when B solution is completely added into A solution, record it as B solution. It is solution C; after stirring solution C for ten minutes, transfer it to a 100mL autoclave, place the autoclave in an oven at 160°C, and react for 8h. The synthesized yellow bismuth vanadate sample was washed alternately with ethanol and water, and dried in a vacuum oven at 50°C for 6 hours.

Embodiment 3

[0050] Preparation of bismuth vanadate precursor: take 1mmol (0.4851g) Bi(NO 3 ) 3 ·5H 2 O crystals were dissolved in 45mL of ethylene glycol solution, stirred to make it completely dissolved, forming a transparent solution, which was recorded as A solution; take 2.5mmol (0.3035g) NaVO 3 Dissolve the powder in 27mL of distilled water, stir to dissolve it completely, form a transparent solution, and record it as B solution; add B solution dropwise into A solution to obtain an orange-yellow solution, when B solution is completely added into A solution, record it as B solution. It is solution C; after stirring solution C for ten minutes, transfer it to a 100mL autoclave, place the autoclave in an oven at 140°C, and react for 12h. The synthesized yellow bismuth vanadate sample was washed alternately with ethanol and water, and dried in a vacuum oven at 50°C for 6 hours.

[0051] Some studies on the crystal structure of the bismuth vanadate precursor prepared in Example 1 were c...

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Abstract

The invention discloses a bismuth / bismuth vanadate composite photocatalyst and a preparation method and application thereof to photocatalytic degradation of organics. The bismuth / bismuth vanadate composite photocatalyst is formed by in-situ growth of nano bismuth particles on surfaces of bismuth vanadate particles. The preparation method includes: mixing vanadium source containing aqueous solution and bismuth source containing ethylene glycol solution, and performing solvothermal reaction to obtain bismuth vanadate; dispersing the bismuth vanadate into water to obtain bismuth vanadate dispersion liquid; mixing the bismuth vanadate dispersion liquid with reductant solution, and performing hydrothermal reaction to obtain the bismuth / bismuth vanadate composite photocatalyst wide in light absorption range, high in visible light utilization rate and high in photocatalytic activity. Compared with bismuth vanadate catalysts, the bismuth / bismuth vanadate composite photocatalyst has the advantage of high catalytic activity in photocatalytic degradation of the organics. In addition, a synthesis method of the bismuth / bismuth vanadate composite photocatalyst is simple, raw materials are cheap and easy to acquire, and production cost is low.

Description

technical field [0001] The invention relates to a bismuth vanadate photocatalyst, in particular to a bismuth-modified bismuth vanadate composite photocatalyst, a method for hydrothermally synthesizing a bismuth / bismuth vanadate composite photocatalyst, and a bismuth / bismuth vanadate composite photocatalyst in photocatalyst The application in catalytic degradation of organic matter belongs to the technical field of photocatalysis. Background technique [0002] Photocatalytic technology refers to the catalyst that converts light energy into the energy required for chemical reactions under light conditions, and then produces catalytic action. It is a new type of high-efficiency energy-saving and environmental protection technology. Among them, photocatalytic degradation uses light radiation to generate active free radicals in the reaction system, and decomposes organic pollutants into non-toxic or low-toxic inorganic substances through processes such as addition, substitution, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/22B01J35/10C02F1/30C02F101/30C02F101/34C02F101/36C02F101/38
CPCC02F1/30B01J23/22C02F2305/08C02F2305/10C02F2101/308C02F2101/38C02F2101/36C02F2101/34B01J35/61B01J35/39
Inventor 陈立妙吴敏景奇锋丰欣妍
Owner CENT SOUTH UNIV
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