Visible light photocatalyst of a kind of novel z type structure and its preparation method and application

Abstract

The invention relates to a new type of Z-shaped photocatalyst and its preparation method and application. In the present invention, the new Z-shaped structure photocatalyst is: Er 3+ :YAlO 3 @Ta 2 O 5 ‑V 5+ ||Fe 3+ ‑TiO 2 / Au. The preparation method includes the following steps: adding Er 3+ :YAlO 3 @Fe 3+ ‑TiO 2 / Au and Er 3+ :YAlO 3 @Ta 2 O 5 ‑V 5+ Add the nanopowder to absolute ethanol and disperse it ultrasonically for 30-40 minutes; heat the resulting suspension at a constant temperature of 60-65°C for 30-40 minutes; dry and grind the resulting product, calcine at 500-600°C for 2-3 hours, and cool. Obtain the target product. Experimental results show that its photocatalytic reaction activity is significantly improved and can be widely used in the field of solar photocatalytic water splitting for hydrogen production.

Description

technical field

[0001] The invention belongs to the field of photocatalytic hydrolysis hydrogen production, in particular to a novel Z-structure photocatalyst Er 3+ :YAlO 3 @Ta 2 o 5 -V 5+ ||Fe 3+ -TiO 2 / Au preparation method and its application in photocatalytic hydrolysis hydrogen production. Background technique

[0002] With the rapid development of global industry and economy, energy has become an important basis for human production activities and social and economic development. Nowadays, the severe energy shortage and the environmental pollution caused by excessive dependence on fossil fuels have seriously affected the normal life of human beings. Many scientists have actively promoted the research of green, sustainable and environment-friendly energy to alleviate the above global problems. Due to the extreme danger of nuclear energy, wind energy and hydropower require too much initial investment, and the benefits are not good, which greatly limits their app...

Examples

Embodiment 1

[0030] Example 1 Novel Z-structure visible light photocatalyst Er 3+ :YAlO 3 @Ta 2 o 5 -V 5+ ||Fe 3+ -TiO 2 / Au

[0031] (1) Preparation method

[0032] 1. Preparation of Er 3+ :YAlO 3 nano powder

[0033] 2.7281g Er 2 o 3 and 0.0464g Y 2 o 3 Dissolve in 50ml concentrated nitric acid, stir magnetically and heat until colorless and transparent to obtain rare earth ion solution; weigh 12.6208g Al(NO 3 ) 3 9H 2 O and 33.9351g citric acid (C 6 h 8 o 7 ·H 2 O), dissolved in distilled water, stirred with a glass rod at room temperature and slowly added to the rare earth ion solution, then stirred at 50°C for 1 to 2 hours, and heated at 80°C for 32 to 38 hours to obtain a sol; The sol was heated at 500°C for 50 minutes, then heated to 1100°C for 120 minutes to obtain Er 3+ :YAlO 3 Nano powder.

[0034] 2. Preparation of Er 3+ :YAlO 3 @Ta 2 o 5 -V 5+ nano powder

[0035] 4.7266g Ta(OEt) 5 Dissolve in 40ml ethanol solution and stir for 2h, during this peri...

Embodiment 2

[0053] Example 2 Catalyst Er 3+ :YAlO 3 @Ta 2 o 5 -V 5+ ||Fe 3+ -TiO 2 Application of / Au in Photocatalytic Hydrogen Production

[0054] (1) TiO 2 and Ta 2 o 5 Molar ratio to Er 3+ :YAlO 3 @Ta 2 o 5 -V 5+ ||Fe 3+ -TiO 2 Effect of Au on Visible-light Catalytic Water Splitting Hydrogen Production Activity

[0055] Experimental conditions: 200mg Er 3+ :YAlO 3 @Ta 2 o 5 -V 5+ ||Fe 3+ -TiO 2 / Au nanopowder and 500 mL of aqueous methanol (10%, pH=6.5). At a temperature of 25°C and a pressure of 101325Pa, a 300W xenon lamp is used to simulate sunlight for illumination, and the illumination intensity is 10.0mW·cm -2 , Lighting time 0.0-5.0h. Experimental results such as Figure 5 As shown, with the prolongation of the illumination time, the TiO 2 and Ta 2 o 5 When the molar ratio is (1.00:0.50, 1.00:0.25, 1.00:0.00), the photocatalytic decomposition of water produces H 2 The amount also increases, when TiO 2 : Ta 2 o 5 =1.00:0.50 will generate H 2 sig...

technical field

[0001] The invention belongs to the field of photocatalytic hydrolysis hydrogen production, in particular to a novel Z-structure photocatalyst Er 3+ :YAlO 3 @Ta 2 o 5 -V 5+ ||Fe 3+ -TiO 2 / Au preparation method and its application in photocatalytic hydrolysis hydrogen production. Background technique

[0002] With the rapid development of global industry and economy, energy has become an important basis for human production activities and social and economic development. Nowadays, the severe energy shortage and the environmental pollution caused by excessive dependence on fossil fuels have seriously affected the normal life of human beings. Many scientists have actively promoted the research of green, sustainable and environment-friendly energy to alleviate the above global problems. Due to the extreme danger of nuclear energy, wind energy and hydropower require too much initial investment, and the benefits are not good, which greatly limits their app...

Examples

Embodiment 1

[0030] Example 1 Novel Z-structure visible light photocatalyst Er 3+ :YAlO 3 @Ta 2 o 5 -V 5+ ||Fe 3+ -TiO 2 / Au

[0031] (1) Preparation method

[0032] 1. Preparation of Er 3+ :YAlO 3 nano powder

[0033] 2.7281g Er 2 o 3 and 0.0464g Y 2 o 3 Dissolve in 50ml concentrated nitric acid, stir magnetically and heat until colorless and transparent to obtain rare earth ion solution; weigh 12.6208g Al(NO 3 ) 3 9H 2 O and 33.9351g citric acid (C 6 h 8 o 7 ·H 2 O), dissolved in distilled water, stirred with a glass rod at room temperature and slowly added to the rare earth ion solution, then stirred at 50°C for 1 to 2 hours, and heated at 80°C for 32 to 38 hours to obtain a sol; The sol was heated at 500°C for 50 minutes, then heated to 1100°C for 120 minutes to obtain Er 3+ :YAlO 3 Nano powder.

[0034] 2. Preparation of Er 3+ :YAlO 3 @Ta 2 o 5 -V 5+ nano powder

[0035] 4.7266g Ta(OEt) 5 Dissolve in 40ml ethanol solution and stir for 2h, during this peri...

Embodiment 2

[0053] Example 2 Catalyst Er 3+ :YAlO 3 @Ta 2 o 5 -V 5+ ||Fe 3+ -TiO 2 Application of / Au in Photocatalytic Hydrogen Production

[0054] (1) TiO 2 and Ta 2 o 5 Molar ratio to Er 3+ :YAlO 3 @Ta 2 o 5 -V 5+ ||Fe 3+ -TiO 2 Effect of Au on Visible-light Catalytic Water Splitting Hydrogen Production Activity

[0055] Experimental conditions: 200mg Er 3+ :YAlO 3 @Ta 2 o 5 -V 5+ ||Fe 3+ -TiO 2 / Au nanopowder and 500 mL of aqueous methanol (10%, pH=6.5). At a temperature of 25°C and a pressure of 101325Pa, a 300W xenon lamp is used to simulate sunlight for illumination, and the illumination intensity is 10.0mW·cm -2 , Lighting time 0.0-5.0h. Experimental results such as Figure 5 As shown, with the prolongation of the illumination time, the TiO 2 and Ta 2 o 5 When the molar ratio is (1.00:0.50, 1.00:0.25, 1.00:0.00), the photocatalytic decomposition of water produces H 2 The amount also increases, when TiO 2 : Ta 2 o 5 =1.00:0.50 will generate H 2 sig...

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