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Visible-light response plasma light catalyst and preparation method thereof

A photocatalyst and plasma technology, applied in the field of photocatalysis, can solve the problems of low photocatalytic activity and gap of tantalum pentanitride, achieve high efficiency of photolysis of water to produce hydrogen, broad application prospects, and increase the effect of visible light utilization

Inactive Publication Date: 2015-08-05
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tantalum pentanitride (Ta 3 N 5 ) has been reported to be used for hydrogen and oxygen production in the presence of appropriate sacrificial agents and under visible light irradiation, but the photocatalytic activity of tantalum pentanitride is still very low, and there is still a big gap from practical application
At present, there has been no nano-gold embedded in tantalum pentoxide (Nano Au / Ta 2 o 5 ), nano-gold embedded in tantalum pentanitride (Nano Au / Ta 3 N 5 ) report on plasmonic photocatalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Preparation of nano-gold embedding tantalum pentoxide Au by sol-gel method 0.01 (Ta 2 o 5 ) 0.99 sample

[0023] 1) Prepare nano gold solution:

[0024] At room temperature, add 4 milliliters (ml) of chloroauric acid solution (chloroauric acid / water=1 g / 50 ml) into 200 ml of water, and heat to boiling. Under stirring, add 4ml of citric acid mixture (sodium citrate / citric acid / water=25g / 2.5g / 250ml) into the boiling chloroauric acid solution, and after the solution continues to boil for 2 minutes, let it cool to room temperature to obtain gold nanoparticles Solution (c=1.9×10 -4 g / ml).

[0025] 2) Preparation of Au 0.01 (Ta 2 o 5 ) 0.99 sample:

[0026] At room temperature, 7.1 milliliters (ml) of TaCl 5 Ethanol solution (25gTaCl 5 Add 250ml of absolute ethanol, c=0.1g / ml), add 24ml of a mixed solution of ethanol and water with a volume ratio of 7:1, add 0.8322g of citric acid and 6.22g of polyethylene glycol under stirring conditions, and stir for...

Embodiment 2

[0029] Example 2: Preparation of nano-gold embedding tantalum pentoxide Au by sol-gel method 0.03 (Ta 2 o 5 ) 0.97 sample

[0030] 1) Prepare nano gold solution:

[0031] The method for preparing the nano-gold solution is the same as in Example 1.

[0032] 2) Preparation of Au 0.03 (Ta 2 o 5 ) 0.97 sample:

[0033] At room temperature, 7.0 milliliters (ml) of TaCl 5 solution (25g of TaCl 5 Add 250ml of absolute ethanol, c=0.1g / ml), add 24ml of a mixed solution of ethanol and water with a volume ratio of 7:1, add 0.8153g of citric acid and 6.2g of polyethylene glycol under stirring conditions, and stir for 2 hours A uniform and transparent precursor sol can be obtained, and then 30.9ml of nano-gold solution is added into the obtained precursor sol under stirring, and after stirring for 3 hours, a dark red precursor sol can be obtained. The precursor sol was heated in a water bath at 80° C. for 12 hours to obtain a gel; the obtained gel was dried in an oven at 110° C...

Embodiment 3

[0036] Example 3: Preparation of nano-gold embedding tantalum pentoxide Au by sol-gel method 0.05 (Ta 2 o 5 ) 0.95 sample

[0037] 1) Prepare nano gold solution:

[0038] The method for preparing the nano-gold solution is the same as in Example 1.

[0039] 2) Preparation of Au 0.05 (Ta 2 o 5 ) 0.95 sample:

[0040] At room temperature, 6.8 milliliters (ml) of TaCl 5 solution (25g of TaCl 5 Add 250ml of absolute ethanol, c=0.1g / ml), add 24ml of a mixed solution of ethanol and water with a volume ratio of 7:1, add 0.7985g of citric acid and 6.16g of polyethylene glycol under stirring conditions, and stir for 2 hours A uniform and transparent precursor sol can be obtained, and then 51.4ml of nano-gold solution is added into the obtained precursor sol under stirring, and after stirring for 3 hours, a dark red precursor sol can be obtained. The precursor sol was heated in a water bath at 80° C. for 12 hours to obtain a gel; the obtained gel was dried in an oven at 110° ...

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Abstract

The invention discloses a visible-light response plasma light catalyst and a preparation method thereof. The method includes the specific steps: preparing a nano gold solution, adding a chloroauric acid solution into water prior to adding a citric acid mixed solution with stirring, cooling to room temperature to obtain the nano gold solution, adding proper tantalum chloride solution into a mixed solution of citric acid containing water and ethanol, and then adding polyethylene glycol to obtain a nano gold embedded tantalum pentoxide plasma light catalyst; preparing a nano gold embedded tantalum pentanitride sample, putting the prepared nano gold embedded tantalum pentoxide plasma light catalyst into a tubular atmosphere furnace, performing nitrogenization with ammonia to obtain a nano gold embedded tantalum pentanitride plasma light catalyst. The nano gold embedded tantalum pentoxide plasma light catalyst and the nano gold embedded tantalum pentanitride plasma light catalyst prepared have high efficiency of photocatalytically splitting of water into hydrogen under the condition of visible light excitation, utilization rate of visible light in sunlight is increased, and the application prospect is broad.

Description

technical field [0001] The invention belongs to photocatalytic technology, in particular to two kinds of visible light responsive nano-gold embedding tantalum pentoxide (Nano Au / Ta 2 o 5 ), nano-gold embedded in tantalum pentanitride (Nano Au / Ta 3 N 5 ) plasmonic photocatalyst and its preparation method. Background technique [0002] Energy issues have become the key to the survival and sustainable development of human society. Hydrogen, known as green fuel, is derived from water and returns to water after combustion. It is recognized as the best substitute for existing chemical fuels such as petroleum and coal. At present, the easiest way for humans to obtain hydrogen is electrolysis, which uses electricity to split water into hydrogen and oxygen. This not only requires high costs, but the decomposition process itself consumes a lot of energy. Solar energy and water are two important renewable resources on the earth. Using solar energy to split water to produce hydroge...

Claims

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Application Information

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IPC IPC(8): B01J23/68B01J27/24C01B3/04
CPCY02E60/36
Inventor 刘小明罗裕京朱红允孙益群
Owner NANCHANG HANGKONG UNIVERSITY
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