Ru monatomic and g-C3N4 composite photocatalyst and preparation method and application thereof

Abstract

The invention provides a Ru monatomic and g-C3N4 composite photocatalyst and a preparation method and application thereof, and belongs to the technical field of nano material synthesis. According to the device, Ru monatomic is loaded on the surface of g-C3N4 by utilizing a simple and rapid one-step calcination method, so that the Ru monatomic and g-C3N4 composite photocatalyst is formed; the photocatalyst can efficiently and stably produce hydrogen through water photolysis under visible light.

Description

technical field

[0001] The invention belongs to the technical field of synthesis of nanomaterials, in particular to a Ru single atom and g-C 3 N 4 Composite photocatalyst and its preparation method and application. Background technique

[0002] Photocatalytic technology is a green method for effectively photo-splitting water to produce hydrogen. Photocatalytic hydrogen production has the advantages of high efficiency, safety, and environmental protection. However, the photocatalytic materials currently developed and applied still have poor stability and cannot fully utilize solar energy and photogenerated load Defects such as high flow rate recombination.

[0003] Graphite carbon nitride (g-C 3 N 4 ) is an n-type semiconducting polymer, which has a narrow band gap (2.7 eV), can make full use of visible light, is non-toxic and harmless, and has the advantages of acid, alkali, and photocorrosion resistance, but pure g-C 3 N 4 However, there are still disadvantages such a...

Examples

Embodiment 1

[0032] Example 1: Preparation of RuCN-0.05% photocatalyst and its photolysis of water to produce hydrogen

[0033] Weigh 20g of urea, dissolve it in deionized water to form solution A; weigh a certain amount of ruthenium acetylacetonate, metal Ru and g-C 3 N 4The mass ratio is 0.05:100, dissolved in ethanol to form solution B; pour B into A, stir magnetically for 10 minutes, stir and dry the mixed solution in an oil bath at 90°C, and after it is completely dry, put the dried sample into a glass Grind it into powder in a mortar, pour it into a 50ml crucible, wrap tin foil on the outside of the crucible, and heat it in a muffle furnace from room temperature to 500°C at a rate of 5°C / min for 3 hours. After cooling down to room temperature naturally, the RuCN-0.05% photocatalyst was obtained.

[0034] The photocatalytic reaction was carried out in a closed glass reaction system, and 50mg RuCN-0.05% composite catalyst was uniformly dispersed in 100ml, 10vol% triethanolamine (TEOA...

Embodiment 2

[0035] Example 2: Preparation of RuCN-0.1% photocatalyst and its photolysis of water to produce hydrogen

[0036] Weigh 20g of urea, dissolve it in deionized water to form solution A; weigh a certain amount of ruthenium acetylacetonate, metal Ru and g-C 3 N 4 The mass ratio is 0.1:100, dissolved in ethanol to form solution B; pour B into A, stir magnetically for 10 minutes, stir and dry the mixed solution in an oil bath at 90°C, and after it is completely dry, put the dried sample into a glass Grind it into powder in a mortar, pour it into a 50ml crucible, wrap tin foil on the outside of the crucible, and heat it in a muffle furnace from room temperature to 525°C at a rate of 5°C / min for 4 hours. After naturally cooling down to room temperature, the RuCN-0.1% photocatalyst was obtained.

[0037] The photocatalytic reaction was carried out in a closed glass reaction system, and 50mg RuCN-0.1% composite catalyst was uniformly dispersed in 100ml, 10vol% triethanolamine (TEOA) a...

Embodiment 3

[0038] Example 3: Preparation of RuCN-0.5% photocatalyst and its photolysis of water to produce hydrogen

[0039] Weigh 20g of urea, dissolve it in deionized water to form solution A; weigh a certain amount of ruthenium acetylacetonate, metal Ru and g-C 3 N 4 The mass ratio is 0.5:100, dissolved in ethanol to form solution B; pour B into A, stir magnetically for 10 minutes, stir and dry the mixed solution in an oil bath at 90°C, and after it is completely dry, put the dried sample into a glass Grind it into powder in a mortar, pour it into a 50ml crucible, wrap tin foil on the outside of the crucible, and heat it in a muffle furnace from room temperature to 500°C at a rate of 5°C / min for 3 hours. After cooling down to room temperature naturally, the RuCN-0.5% photocatalyst was obtained.

[0040] The photocatalytic reaction was carried out in a closed glass reaction system, and 50mg RuCN-0.5% composite catalyst was uniformly dispersed in 100ml, 10vol% triethanolamine (TEOA) a...

technical field

[0001] The invention belongs to the technical field of synthesis of nanomaterials, in particular to a Ru single atom and g-C 3 N 4 Composite photocatalyst and its preparation method and application. Background technique

[0002] Photocatalytic technology is a green method for effectively photo-splitting water to produce hydrogen. Photocatalytic hydrogen production has the advantages of high efficiency, safety, and environmental protection. However, the photocatalytic materials currently developed and applied still have poor stability and cannot fully utilize solar energy and photogenerated load Defects such as high flow rate recombination.

[0003] Graphite carbon nitride (g-C 3 N 4 ) is an n-type semiconducting polymer, which has a narrow band gap (2.7 eV), can make full use of visible light, is non-toxic and harmless, and has the advantages of acid, alkali, and photocorrosion resistance, but pure g-C 3 N 4 However, there are still disadvantages such a...

Examples

Embodiment 1

[0032] Example 1: Preparation of RuCN-0.05% photocatalyst and its photolysis of water to produce hydrogen

[0033] Weigh 20g of urea, dissolve it in deionized water to form solution A; weigh a certain amount of ruthenium acetylacetonate, metal Ru and g-C 3 N 4The mass ratio is 0.05:100, dissolved in ethanol to form solution B; pour B into A, stir magnetically for 10 minutes, stir and dry the mixed solution in an oil bath at 90°C, and after it is completely dry, put the dried sample into a glass Grind it into powder in a mortar, pour it into a 50ml crucible, wrap tin foil on the outside of the crucible, and heat it in a muffle furnace from room temperature to 500°C at a rate of 5°C / min for 3 hours. After cooling down to room temperature naturally, the RuCN-0.05% photocatalyst was obtained.

[0034] The photocatalytic reaction was carried out in a closed glass reaction system, and 50mg RuCN-0.05% composite catalyst was uniformly dispersed in 100ml, 10vol% triethanolamine (TEOA...

Embodiment 2

[0035] Example 2: Preparation of RuCN-0.1% photocatalyst and its photolysis of water to produce hydrogen

[0036] Weigh 20g of urea, dissolve it in deionized water to form solution A; weigh a certain amount of ruthenium acetylacetonate, metal Ru and g-C 3 N 4 The mass ratio is 0.1:100, dissolved in ethanol to form solution B; pour B into A, stir magnetically for 10 minutes, stir and dry the mixed solution in an oil bath at 90°C, and after it is completely dry, put the dried sample into a glass Grind it into powder in a mortar, pour it into a 50ml crucible, wrap tin foil on the outside of the crucible, and heat it in a muffle furnace from room temperature to 525°C at a rate of 5°C / min for 4 hours. After naturally cooling down to room temperature, the RuCN-0.1% photocatalyst was obtained.

[0037] The photocatalytic reaction was carried out in a closed glass reaction system, and 50mg RuCN-0.1% composite catalyst was uniformly dispersed in 100ml, 10vol% triethanolamine (TEOA) a...

Embodiment 3

[0038] Example 3: Preparation of RuCN-0.5% photocatalyst and its photolysis of water to produce hydrogen

[0039] Weigh 20g of urea, dissolve it in deionized water to form solution A; weigh a certain amount of ruthenium acetylacetonate, metal Ru and g-C 3 N 4 The mass ratio is 0.5:100, dissolved in ethanol to form solution B; pour B into A, stir magnetically for 10 minutes, stir and dry the mixed solution in an oil bath at 90°C, and after it is completely dry, put the dried sample into a glass Grind it into powder in a mortar, pour it into a 50ml crucible, wrap tin foil on the outside of the crucible, and heat it in a muffle furnace from room temperature to 500°C at a rate of 5°C / min for 3 hours. After cooling down to room temperature naturally, the RuCN-0.5% photocatalyst was obtained.

[0040] The photocatalytic reaction was carried out in a closed glass reaction system, and 50mg RuCN-0.5% composite catalyst was uniformly dispersed in 100ml, 10vol% triethanolamine (TEOA) a...

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