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Visible-light catalyst and preparation method and application thereof

A catalyst and visible light technology, applied in the field of photocatalysis, can solve the problems of poor semiconductor stability, inability to release hydrogen and oxygen at the same time, failure, etc., and achieve the effect of improving quantum efficiency

Active Publication Date: 2014-09-24
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, semiconductors with narrow band gaps are less stable and are prone to failure due to photocorrosion, while some catalysts with suitable band gaps cannot release hydrogen and oxygen at the same time, so only a very small number of semiconductors can split water in one step.

Method used

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  • Visible-light catalyst and preparation method and application thereof
  • Visible-light catalyst and preparation method and application thereof
  • Visible-light catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: WO 3 / Graphene Visible Light Catalytic Degradation of Oxidative Wastewater

[0019] Preparation of WO with 0.2% graphene 3 catalyst:

[0020] 1) Weigh 0.0093g graphene oxide (GO) powder prepared by Hummer method, and disperse in

[0021] 50mL of deionized water, ultrasonic for 1h to fully peel off, after standing still, take the supernatant for later use;

[0022] 2) Weigh 6.4g (NH 4 ) 2 WO 4 2H 2 O, heated in a water bath at 60°C and dissolved in 50mL of deionized water, added 6mL of absolute ethanol, 2mL of n-propanol, and 1mL of acetone to fully mix to form a microemulsion, and added concentrated HCl drop by drop under vigorous stirring. Until no more precipitation occurs, slowly add the solution obtained in 1) to the mixed solution, add dilute HCl dropwise to adjust the pH value to 1.0, continue stirring for 30min, and transfer to 150mL

[0023] In a high-temperature hydrothermal reaction kettle, keep warm at 120°C for 24 hours, and cool down to ...

Embodiment 2

[0027] Example 2 WO 3 / Graphene Visible Light Catalytic Degradation of Industrial Wastewater

[0028] Preparation of WO with 0.3% graphene 3 catalyst:

[0029] 1) Weigh 0.0139g of graphene oxide (GO) powder prepared by the improved Hummer method, disperse it in 20mL of deionized water, ultrasonically peel it off for 1h, and take the supernatant after standing for use;

[0030] 2) Weigh 4.8g (NH 4 ) 2 WO 4 2H 2 O, dissolve in 30mL of deionized water by heating in a water bath at 60°C, add 4mL of absolute ethanol, 1.5mL of n-propanol, and 0.5mL of acetone to fully mix to form a microemulsion, add concentrated HCl drop by drop under vigorous stirring, first precipitate, stir and precipitate Dissolve until no more precipitation occurs, slowly add the solution obtained in 1) into the mixed solution, add a certain amount of dilute HCl dropwise to adjust the pH value to 0.5, continue stirring for 20min, transfer to a 100mL high-temperature hydrothermal reaction kettle, keep it...

Embodiment 3

[0034] Example 3: WO 3 / Graphene Visible Light Catalytic Decomposition of Water to Produce Oxygen

[0035] Preparation of WO containing 0.4% graphene 3 catalyst:

[0036] 1) Weigh 0.0186g of graphene oxide (GO) powder prepared by the improved Hummer method, disperse it in 50mL of deionized water, ultrasonically peel it off for 1h, and take the supernatant after standing for use;

[0037] 2) Weigh 6.4g (NH 4 ) 2 WO 4 2H 2 O, heated in a water bath at 60°C and dissolved in 50mL of deionized water, added 6mL of absolute ethanol, 2mL of n-propanol, and 1mL of acetone to form a microemulsion, and added concentrated HCl drop by drop under vigorous stirring. Until no more precipitation occurs, slowly add the solution obtained in 1) into the mixed solution, add dilute HCl dropwise to adjust the pH value to 1.5, continue stirring for 30 minutes, transfer to a 150mL high-temperature hydrothermal reaction kettle, keep it at 160°C for 72 hours, and naturally cool to room temperatur...

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Abstract

The invention discloses a grapheme-doped WO3 visible-light response photocatalyst and a preparation method thereof, and belongs to the technical field of photocatalysis, wherein graphene is mainly used as a template carrier of nanometer WO3 to improve the photocatalysis activity of the nanometer WO3. The photocatalyst is prepared through multiple methods such as a liquid phase method and a solvothermal method by taking hydrated ammonium tungstate as a tungsten source and graphene as a carrier. A result shows that WO3 doped with a small amount of graphene has very good response in a visible-light area, can effectively realize the wastewater degradation and also can realize the high-efficiency oxygen production when used as the traditional oxygen production catalyst of an Z-shaped photocatalysis model; more importantly, the photocatalyst realizes the high-efficiency oxygen production through the change of an energy band structure. The successful development of the photocatalyst has certain theoretical and practical significance for degrading wastewater through visible-light catalysis and solving the problem of energy crisis through water photolysis.

Description

technical field [0001] The invention relates to the field of photocatalysis, more specifically, to a graphene-doped WO 3 The preparation method and application of the photocatalyst, the catalyst can be used for research and application in the field of photocatalysis such as photodegradation of organic matter and photocatalytic water splitting. Background technique [0002] Since 1972, researchers discovered that TiO 2 Since water can be split into hydrogen and oxygen, the research on semiconductor-catalyzed water splitting has attracted the attention of many researchers. It is much more convenient to store energy in the form of hydrogen than electricity or thermal energy. In addition, hydrogen has a high calorific value (≈143kJ / g), clean and environmentally friendly, non-toxic and many other advantages. [0003] Under light conditions, the electrons in the outer layer of the semiconductor are first excited and transition from the valence band to the conduction band. To rea...

Claims

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Application Information

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IPC IPC(8): B01J23/30C02F1/30C01B13/02C02F103/30
CPCY02W10/37
Inventor 吴东方郭威威高宇
Owner SOUTHEAST UNIV
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