Preparation method and application of space charge separation type composite photocatalyst

A space charge, photocatalytic reactor technology, applied in the field of photocatalysis, can solve the problems of photogenerated carrier separation efficiency limitation, low photocatalytic hydrogen production efficiency, load, etc., achieving good photocatalytic stability, simple synthesis process, effect on sustainable development

Active Publication Date: 2017-09-19
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

However, in the above reports, the researchers only loaded a single co-catalyst (such as reduced Pt, AuPt alloy, or oxidized NiO) on the surface of the nano-step photocatalyst.
In this case, the separation efficiency of photogenerated carriers is still limited, and the efficiency of photocatalytic hydrogen production is low.

Method used

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  • Preparation method and application of space charge separation type composite photocatalyst
  • Preparation method and application of space charge separation type composite photocatalyst
  • Preparation method and application of space charge separation type composite photocatalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Weigh 1 g of CaIn 2 S 4 powder, added to a photocatalytic reactor containing 100 ml of deionized water, and then added 3.15 g of sodium sulfite Na 2 SO3 and 6 grams of sodium sulfide Na 2 S·9H 2 O, stir to make CaIn 2 S 4 The powder is fully suspended in the sulfide aqueous solution;

[0031] Add 310 µl of chloroauric acid HAuCl to the above suspension 4 aqueous solution (at a concentration of 40 g / L) and 160 µl of silver nitrate AgNO 3 Aqueous solution (concentration of 40 g / L), fully stirred for 10 minutes, and then sealed the photocatalytic reactor;

[0032] Nitrogen gas (flow rate: 50 ml / min) was introduced into the above-mentioned photocatalytic reactor for 45 minutes to exhaust the remaining air in the reactor, and then the light reaction under visible light was started for 2 hours. After the reaction, filter, wash and dry to obtain Au 0.6 Ag 0.4 / CaIn 2 S 4 Composite materials (where 0.6 refers to the loading of Au relative to CaIn 2 S 4 is 0.6 wt%,...

Embodiment 2

[0037] Weigh out 2 g of CaIn 2 S 4 powder, added to a photocatalytic reactor containing 150 ml of deionized water, and then 1.7 g of silver nitrate AgNO 3 , stirred for 20 minutes to obtain a uniform suspension;

[0038] Add 210 microliters of manganese nitrate Mn(NO 3 ) 2 Aqueous solution (concentration: 40 g / L), fully stirred for 20 minutes, then sealed the photocatalytic reactor again and started light reaction for 4 hours. After the reaction is finished, filter, wash, and dry to obtain MnO x / CaIn 2 S 4 (the loading of MnOx is 0.1 wt%);

[0039] Weigh the MnO obtained above x / CaIn 2 S 4 150 mg, add 20 ml methanol, stir to make CaIn 2 S 4 The powder is fully suspended in methanol aqueous solution;

[0040] Add 32 µl of chloroauric acid HAuCl to the above suspension 4 aqueous solution (concentration of 40 g / L) and 14 μl copper nitrate Cu(NO 3 ) 2 Aqueous solution (concentration of 40 g / L), fully stirred for 15 minutes, and then sealed the photocatalytic rea...

Embodiment 3

[0048] Weigh out 0.5 g of CaIn 2 S 4 Powder, add in the photocatalytic reactor containing 80 milliliters of deionized water, then add 1.66 grams of potassium iodide KI, stir, make CaIn 2 S 4 The powder is fully suspended in KI aqueous solution;

[0049] Add 26 µl of chloroauric acid HAuCl to the above suspension 4 aqueous solution (concentration of 40 g / L) and 108 microliters of palladium nitrate Pd(NO 3 ) 2 Aqueous solution (concentration of 40 g / L), fully stirred for 30 minutes, and then sealed the photocatalytic reactor;

[0050] Introduce argon gas (flow rate 100 ml / min) into the photocatalytic reactor for 20 minutes to exhaust the remaining air in the reactor, and then start to react under visible light for 4 hours. After the reaction, filter, wash and dry to obtain Au 0.4 PD 1.6 / CaIn 2 S 4 Composite materials (where 0.4 refers to the loading of Au relative to CaIn 2 S 4 is 0.4 wt%, 1.6 refers to the loading of Pd relative to CaIn 2 S 4 is 1.6 wt%);

[005...

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Abstract

The invention provides a space charge separation type composite photocatalyst, which has a chemical formula of Au alloy / MOx / CaIn2S4. By an illumination reducing method, the reduced cocatalyst nanometer Au alloy is deposed onto convex positions of nanometer steps of the surface of the CaIn2S4 in an in-situ / site-selection manner; the oxidized cocatalyst MOx is deposed onto concave positions of nanometer steps of the surface of the CaIn2S4 in an in-situ / site-selection manner, so that the thorough separation of the photocatalytic reduction reaction site and the oxidization reaction site in the space can be realized; the compounding probability of photon-generated carriers can be effectively inhibited; the photocatalysis hydrogen preparation efficiency is greatly improved. The prepared space charge separation type composite photocatalyst Au alloy / MOx / CaIn2S4 can sufficiently absorb visible light; in addition, the water can be effectively decomposed for hydrogen preparation under the visible light conditions; the highest hydrogen generation speed reaches 829.5 mumol / h; the sustainable development in the energy source and environment fields can be facilitated.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and relates to a preparation method of a space charge separation type composite photocatalyst and its application in photocatalytic decomposition of water to produce hydrogen. Background technique [0002] With the development of the economy, the global energy consumption has increased dramatically, most of which are obtained by burning fossil fuels. The huge use of fossil fuels has not only caused the depletion of non-renewable resources such as oil, coal, and natural gas, but also caused a large amount of CO 2 Emissions have also caused increasingly serious environmental problems, and the development of new and clean energy has attracted more and more attention from governments and scientists in various countries. Solar energy is inexhaustible and clean and pollution-free. If solar energy can be fully utilized, energy and environmental problems will be greatly alleviated. However, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/043B01J27/045C01B3/04
CPCB01J27/043B01J27/045B01J35/004C01B3/042Y02E60/36
Inventor 丁建军陈林田兴友
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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