Preparation method of pure water cracking semiconductor catalyst for realizing visible light response by bimetal ion co-doped strontium titanate

Abstract

The invention discloses a preparation method of a pure water cracking semiconductor catalyst for realizing visible light response by bimetallic ion co-doped strontium titanate, which comprises the following steps: conventionally mixing a (III) IA source compound and a (III) IB source compound with a common chemical containing Sr and Ti elements in proportion, and carrying out chemical complexation through simple heating treatment to obtain the pure water cracking semiconductor catalyst. And the double metal ion co-doped SrTiO3 body is directly synthesized. The preparation method comprises the following steps: uniformly mixing SrTiO3 with SrCl2, carrying out a certain thermal insulation heat treatment, removing excess SrCl2 by using a large amount of water to obtain a target product, and synthesizing the bimetallic ion co-doped SrTiO3 with specific morphology of (III) and (III) , the molar ratio of (III) ions is 0.1-0.5%, the molar ratio of (III) ions is 0.1-0.5%, and RhCrOx and CoOOH are loaded as cocatalysts. The reaction conditions are mild and safe, and the used reagents are low in price.

Description

technical field

[0001] The invention belongs to the technical field of synthesis of photocatalytic nanomaterials, and particularly relates to two types of (III) valence bimetallic ion co-doped strontium titanate semiconductor catalysts and a preparation method thereof. Background technique

[0002] Semiconductor photocatalysis can favorably facilitate many difficult chemical reactions under mild conditions, such as photocatalytic degradation of organic compounds, photocatalytic CO 2 Reduction, synthesis of ammonia, methanol and other high value-added chemical raw materials, photocatalytic water splitting, etc., are sustainable strategies for the production of fuels and chemicals, and photocatalysis is considered as a key technology for converting photon energy into chemical energy. Due to its high combustion calorific value and environmental friendliness, hydrogen is considered to be a clean alternative energy source. 2mol of water can be split into 2mol of hydrogen and 1mol...

Examples

Embodiment 1

[0032] an Al 3+ , Cr 3+ The preparation method of the ion co-doped strontium titanate semiconductor catalyst comprises the following steps:

[0033] Weigh 0.08mol of strontium nitrate, 20ml of ethylene glycol and 6ml of isopropyl titanate respectively, mix them in a beaker, heat and stir at 80°C for 100min, continue to add 0.0008mol of aluminum nitrate and 0.0008mol of chromium nitrate, and transfer the mixture They were placed in an oil bath and heated at 120 °C for 600 min to obtain a transparent resin gel, and then heat-treated in air at 450 °C for 6 hours to obtain double metal ion co-doped SrTiO 3 The precursor, the precursor is generally black. Double metal ion co-doped SrTiO obtained after the precursor heat treatment at 900℃ 3 , again with excess SrCl 2 After uniform grinding, it was kept in a muffle furnace at 1000°C for 10 hours. After taking it out, it was filtered and washed with a large amount of deionized water, and then the material was dried in a drying bo...

Embodiment 2

[0039] a Ga 3+ , Rh 3+ The preparation method of the ion co-doped strontium titanate semiconductor catalyst comprises the following steps:

[0040] Weigh 0.15 mol of strontium nitrate, 25 ml of ethylene glycol and 10 ml of isopropyl titanate, respectively, mix them in a beaker, heat and stir at 90°C for 100 min, continue to add 0.0015 mol of gallium nitrate and 0.0015 mol of rhodium nitrate, and transfer the mixture. Placed in an oil bath and heated at 150 °C for 700 min to obtain a transparent resin gel, and then heat-treated at 550 °C in air for 6 hours to obtain double metal ion co-doped SrTiO 3 The precursor, the precursor is generally black. Double metal ion co-doped SrTiO obtained after the precursor heat treatment at 900℃ 3 , again with excess SrCl 2 After uniform grinding, it was kept in a muffle furnace at 1100°C for 12 hours. After taking out, it was filtered and washed with a large amount of deionized water, and then the material was dried in a drying box at 80...

technical field

[0001] The invention belongs to the technical field of synthesis of photocatalytic nanomaterials, and particularly relates to two types of (III) valence bimetallic ion co-doped strontium titanate semiconductor catalysts and a preparation method thereof. Background technique

[0002] Semiconductor photocatalysis can favorably facilitate many difficult chemical reactions under mild conditions, such as photocatalytic degradation of organic compounds, photocatalytic CO 2 Reduction, synthesis of ammonia, methanol and other high value-added chemical raw materials, photocatalytic water splitting, etc., are sustainable strategies for the production of fuels and chemicals, and photocatalysis is considered as a key technology for converting photon energy into chemical energy. Due to its high combustion calorific value and environmental friendliness, hydrogen is considered to be a clean alternative energy source. 2mol of water can be split into 2mol of hydrogen and 1mol...

Examples

Embodiment 1

[0032] an Al 3+ , Cr 3+ The preparation method of the ion co-doped strontium titanate semiconductor catalyst comprises the following steps:

[0033] Weigh 0.08mol of strontium nitrate, 20ml of ethylene glycol and 6ml of isopropyl titanate respectively, mix them in a beaker, heat and stir at 80°C for 100min, continue to add 0.0008mol of aluminum nitrate and 0.0008mol of chromium nitrate, and transfer the mixture They were placed in an oil bath and heated at 120 °C for 600 min to obtain a transparent resin gel, and then heat-treated in air at 450 °C for 6 hours to obtain double metal ion co-doped SrTiO 3 The precursor, the precursor is generally black. Double metal ion co-doped SrTiO obtained after the precursor heat treatment at 900℃ 3 , again with excess SrCl 2 After uniform grinding, it was kept in a muffle furnace at 1000°C for 10 hours. After taking it out, it was filtered and washed with a large amount of deionized water, and then the material was dried in a drying bo...

Embodiment 2

[0039] a Ga 3+ , Rh 3+ The preparation method of the ion co-doped strontium titanate semiconductor catalyst comprises the following steps:

[0040] Weigh 0.15 mol of strontium nitrate, 25 ml of ethylene glycol and 10 ml of isopropyl titanate, respectively, mix them in a beaker, heat and stir at 90°C for 100 min, continue to add 0.0015 mol of gallium nitrate and 0.0015 mol of rhodium nitrate, and transfer the mixture. Placed in an oil bath and heated at 150 °C for 700 min to obtain a transparent resin gel, and then heat-treated at 550 °C in air for 6 hours to obtain double metal ion co-doped SrTiO 3 The precursor, the precursor is generally black. Double metal ion co-doped SrTiO obtained after the precursor heat treatment at 900℃ 3 , again with excess SrCl 2 After uniform grinding, it was kept in a muffle furnace at 1100°C for 12 hours. After taking out, it was filtered and washed with a large amount of deionized water, and then the material was dried in a drying box at 80...

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