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Graphene-based bismuth tungstate composite photocatalyst and its preparation method and application

A technology of alkenyl bismuth tungstate and photocatalyst, which is applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., and can solve the problem of narrow ultraviolet spectrum and limited application of titanium dioxide, etc. problem, to achieve the effect of simple operation, simple and easy-to-operate preparation method, low-cost and high-yield

Inactive Publication Date: 2018-01-05
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its narrow ultraviolet spectrum greatly limits the further application of titanium dioxide.

Method used

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  • Graphene-based bismuth tungstate composite photocatalyst and its preparation method and application
  • Graphene-based bismuth tungstate composite photocatalyst and its preparation method and application
  • Graphene-based bismuth tungstate composite photocatalyst and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0043] Dissolve 0.97g of bismuth nitrate pentahydrate in 10mL of glacial acetic acid, and record it as solution A; dissolve 0.33g of sodium tungstate dihydrate in 50mL of deionized water, and record it as solution B; add solution B to solution A and mix until uniform After mixing, transfer it to a stainless steel autoclave lined with polytetrafluoroethylene and react at 180°C for 3 hours. After naturally cooling to room temperature, filter and wash the solid on the filter paper in an oven at 60°C for 4 hours to obtain the following: figure 1 The white flower-like bismuth tungstate photocatalyst shown in the figure shows that the photocatalyst prepared by this method is assembled from nanosheets, with a uniform shape and a particle size of about 1.5 μm. .

[0044] Get 0.25g photocatalyst, take the ciprofloxacin hydrochloride of 250mL 10mg / L as target pollutant, adopt Figure 7 The shown device was subjected to photocatalytic degradation experiments under visible light. The exp...

Embodiment 2

[0046] Dissolve 0.97g of bismuth nitrate pentahydrate in 10mL of glacial acetic acid, and record it as solution A; dissolve 0.33g of sodium tungstate dihydrate in 50mL of deionized water, and record it as solution B; add solution B to solution A and mix until uniform After mixing, transfer it to a stainless steel autoclave lined with polytetrafluoroethylene and react at 180°C for 3 hours. After cooling to room temperature naturally, filter and wash, and dry the solid on the filter paper in an oven at 60°C for 4 hours to obtain a white flower. Bismuth tungstate photocatalyst, denoted as C; 10mg of graphene oxide was added to 100mL of deionized water, the pH was adjusted to 7.5 with ammonia water and ultrasonically stripped for 120min, and the supernatant was centrifuged on a low-speed centrifuge and denoted as solution D. Then add 1g of flower-shaped bismuth tungstate to solution D, stir for 4 hours, and record it as solution E; add 0.2mL of hydrazine hydrate to solution E, and ...

Embodiment 3

[0048] Dissolve 0.97g of bismuth nitrate pentahydrate in 10mL of glacial acetic acid, and record it as solution A; dissolve 0.33g of sodium tungstate dihydrate in 50mL of deionized water, and record it as solution B; add solution B to solution A and mix until uniform After mixing, transfer it to a stainless steel autoclave lined with polytetrafluoroethylene and react at 180°C for 3 hours. After cooling to room temperature naturally, filter and wash, and dry the solid on the filter paper in an oven at 60°C for 4 hours to obtain a white flower. Bismuth tungstate photocatalyst, denoted as C; 20mg of graphene oxide was added to 100mL of deionized water, the pH was adjusted to 7.5 with ammonia water and ultrasonically stripped for 120min, and the supernatant was centrifuged on a low-speed centrifuge and denoted as solution D. Then add 1g of flower-like bismuth tungstate to solution D, stir for 4 hours, and record it as solution E; add 0.4mL of hydrazine hydrate to solution E, and st...

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Abstract

The invention discloses a graphene-based bismuth tungstate composite photocatalyst and its preparation method and application. The invention uses bismuth nitrate pentahydrate, sodium tungstate dihydrate, glacial acetic acid and graphene oxide as raw materials, through low-temperature hydrothermal and hydrazine hydrate The flower-like bismuth tungstate nano-photocatalyst and graphene-based bismuth tungstate composite photocatalyst with three-dimensional structure were prepared by steps such as reduction. The preparation method of the invention is simple and easy to operate, low in cost, high in yield at low temperature, excellent in visible light activity, capable of large-scale production, and has strong applicability and broad market prospects.

Description

technical field [0001] The invention belongs to the technical field of visible light catalytic materials, and in particular relates to a graphene-based bismuth tungstate composite photocatalyst and a preparation method and application thereof. Background technique [0002] my country's pharmaceutical industry produces a large amount of organic wastewater every year, which contains a large amount of antibiotics. Antibiotics exist in wastewater, because they have a strong inhibitory effect on microorganisms, resulting in poor biochemical treatment performance, which brings great challenges to sewage treatment, and is one of the typical refractory wastewater. [0003] As an advanced oxidation technology, photocatalytic technology has received extensive attention in the treatment of organic pollutants in recent years. Nano-photocatalysis is a nano-semiconductor material that generates extremely active hydroxyl radicals (OH) under the irradiation of light, and effectively decomp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/31C02F1/30C02F101/38
Inventor 陈琳李玉坤朱亮汪跃殷绪华
Owner HOHAI UNIV
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