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A kind of preparation method and application of graphene-bismuth tungstate

A technology of bismuth tungstate and graphene, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of low price, limited visible light response range, and difficult to take into account Good catalytic effect and other problems, to achieve the effect of increasing active sites, improving catalytic performance, and improving catalytic performance

Active Publication Date: 2021-07-16
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, a single Bi 2 WO 6 There are deficiencies in photodegradation, its visible light response range is limited, and the recombination rate of photogenerated electrons and holes is relatively high
[0006] Therefore, a preparation method of graphene-bismuth tungstate and its application have been developed, which are used to solve the problems of catalysts used in the cathode hydrogen evolution reaction of electrolyzed water in the prior art. The technical defect obtained has become a problem to be solved urgently by those skilled in the art

Method used

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  • A kind of preparation method and application of graphene-bismuth tungstate
  • A kind of preparation method and application of graphene-bismuth tungstate

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Experimental program
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Embodiment 1

[0031] Step 1, weigh 1 mmol of sodium tungstate (NA 2 WO 4 · 2h 2 O), 2mmol nitrate (Bi (NO) 3 ) 3 · 5h 2 O) 0.05 GCTAB was mixed in 80 ml of deionized water, at room temperature, stirring at room temperature for 30 min to uniform, transferred to the hydrothermal reaction, wherein the temperature of the hydrothermal reaction was 120 ° C. The temperature of the hydrothermal reaction is 20 h. After the hydrothermal reaction, it was washed and dried, and the tungstate is obtained by washing and dried; wherein the washed method is water and ethanol, respectively, and the drying method is: 70 ° C drying for 10 h.

[0032] Step 2, take a step of 1 step, tungstate 400 mg, soluble in 200 ml deionized water, and ultrasonically peeled off after dissolving to obtain two-dimensional tungsten tungsten nanofilates; wherein the frequency of ultrasonic dispersion is 20 kHz, ultrasonic dispersion time For 2H.

[0033] Step, 10 mg of graphene dissolve in 10 ml of deionized water, and dissolve graph...

Embodiment 2

[0036] Step 1, weigh 1 mmol sodium tungstate (Na2WO 4 · 2h 2 O), 2mmol nitrate (Bi (NO) 3 ) 3 · 5h 2 O) Following 0.05 GCTAB and dissolved in 80 ml of deionized water, stirred at room temperature for 45 min to uniform, transferred to a hydrothermal reaction, wherein the temperature of the hydrothermal reaction is 140 ° C, water The thermal reaction time is 24h. After the hydrothermal reaction, it was washed and dried, and the tungstate tungstate was obtained; where the washed method was washed twice, the drying method was: 80 ° C drying 12h.

[0037] Step 2, take the stepped layer of tungstate 400 mg, dissolved in 200 ml of deionized water, and then dissolved, ultrasonic peeling, to obtain a two-dimensional tungsterate nano-niocne; wherein the frequency of ultrasonic dispersion is 25 kHz, ultrasonic dispersion time. For 1h.

[0038]Step three, 10 mg of graphene dissolve in 10 ml of deionized water, is sufficiently dissolved with graphene by ultrasonic dispersion of 50 kHz; after d...

Embodiment 3

[0041] Step 1, weigh 1 mmol sodium tungstate (Na2WO 4 · 2h 2 O), 2mmol nitrate (Bi (NO) 3 ) 3 · 5h 2 O) Following 0.05 GCTAB and dissolved in 80 ml of deionized water, stirring at room temperature for 50 min to uniform, transferred to a hydrothermal reaction, wherein the temperature of the hydrothermal reaction is 160 ° C, water The thermal reaction time is 18 h. After the hydrothermal reaction, the tungstonate was sequentially washed and dried, and the tungstate of tungstate was obtained; where the washed method was ethanol 3 times, the drying method was: 60 ° C drying 8 h.

[0042] Step 2, take a step of 1 step, tungstate 400 mg, dissolved in 200 ml of deionized water, soon peeling after dissolving, decentralized two-dimensional tungsterate nanococcal; wherein the frequency of ultrasonic dispersion is 22 kHz, ultrasonic dispersion time It is 3h.

[0043] Step, 10 mg of graphene dissolve in 10 ml of deionized water, is sufficiently dissolved in graphene by ultrasonic dispersion o...

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Abstract

The invention belongs to the technical field of research and development of electrolytic catalysts, and in particular relates to a preparation method of graphene-bismuth tungstate and its application. The invention provides a preparation method of graphene-bismuth tungstate, comprising: preparation of bismuth tungstate by hydrothermal reaction, ultrasonic stripping, preparation of graphene quantum dots and laser dissolution compounding. The present invention also provides the application of the above preparation method in the preparation of electrocatalytic materials. In the present invention, the raw materials used are convenient and easy to obtain; at the same time, by introducing graphene quantum dots, the active sites of bismuth tungstate are increased, which effectively improves the catalytic performance of bismuth tungstate; Compared with the bismuth bismuth catalyst, the graphene-bismuth tungstate prepared by the technical solution provided by the invention has a catalytic performance of 9-13%; it solves the problems in the prior art for photoelectric degradation or cathode hydrogen evolution reaction of electrolyzed water, There are technical defects that it is difficult to recycle and reuse, and take into account good catalytic effect, low price and easy availability of raw materials.

Description

Technical field [0001] The present invention belongs to the field of electrolysis catalyst R & D technology, and more particularly to a method for preparation of glycol - tungstate and its application thereof. Background technique [0002] Environmental and energy issues are a major problem facing human beings. In order to achieve sustainable development of human resources, we need to develop clean energy systems to reduce pollutants to protect the ecological environment. Renewable energy includes solar energy, wind energy, hydrogen energy, biomarity, and the like. [0003] Hydrogen can be a clean renewable dye, the combustion of hydrogen can be provided with three times the energy of general fossil fuel, and the product is non-polluting, with zero pollutant emissions, recyclable and other advantages. After the first report, the method was first reported, and the method was widely concerned and studied. Hydrogen can be supplied as an energy source as an energy source, and hydroge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/31C25B1/04C25B11/091
CPCB01J23/31B01J35/0033C25B1/04C25B11/091Y02E60/36
Inventor 刘璞魏子晔李振邦王建兴刘才超石磊杨国伟
Owner SUN YAT SEN UNIV
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