Preparation method of bismuth vanadate/strontium titanate composite photocatalyst

A technology of catalyst and composite light, which is applied in the field of composite materials and clean energy, and can solve the problems of low migration rate of photogenerated carriers, inability of catalyst to produce hydrogen, and narrow bandgap width.

Active Publication Date: 2017-02-15
NORTHWEST NORMAL UNIVERSITY
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AI Technical Summary

Problems solved by technology

[0003] BiVO 4 It is a photocatalyst that can respond to visible light. It has a narrow band gap and good chemical stability. It is an effective alternative semiconductor material. Its preparation method is also quite skilled, but similarly, for this semiconductor Said that the migration rate of photogenerated carriers is low, and the catalyst itself is not capable of producing hydrogen

Method used

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  • Preparation method of bismuth vanadate/strontium titanate composite photocatalyst
  • Preparation method of bismuth vanadate/strontium titanate composite photocatalyst
  • Preparation method of bismuth vanadate/strontium titanate composite photocatalyst

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Embodiment 1

[0033] 1) BiVO 4 preparation of

[0034] 2.425g Bi(NO 3 ) 3 ·5H 2 O was added with 25 mL of diluted 10% (w / w) HNO 3 In the solution, magnetically stir for 15-20min, add 2.104g citric acid monohydrate, and continue to stir to obtain a uniform and stable white solution, which is designated as solution A;

[0035] 0.5845g NH 4 VO 3 Dissolve in 20mL of distilled water at 90°C, place in a constant temperature water bath at 80°C and stir for 15 minutes, then add 2.104g of citric acid monohydrate, and continue stirring until a uniform and stable dark blue solution is obtained, which is designated as solution B; Add liquid A, the color of the solution gradually deepens, and finally turns dark green, which is recorded as solution C; adjust the pH of solution C to 6.5 with ammonia water, then place it in a constant temperature water bath at 80°C and continue stirring, and take it out after forming a dark blue gel Transfer to a drying oven at 70°C and dry for 12 hours; finally, af...

Embodiment 2

[0041] (1) BiVO 4 The preparation: with embodiment 1;

[0042] (2) SrTiO 3 The preparation: with embodiment 1;

[0043] (3) BiVO 4 / SrTiO 3 Preparation of Composite Photocatalyst

[0044] Accurately weigh 0.015g BiVO 4 Added to 30mL distilled water, stirred at room temperature for 15min, ultrasonicated for 15min; then added 0.485g SrTiO 3 , stirred for 15 min, ultrasonicated for 15 min, evaporated to dryness in a constant temperature water bath at 60 °C (about 3 h), and then transferred to a muffle furnace for calcination at 500 °C for 2 h to prepare BiVO 4 / SrTiO 3 composite photocatalyst. BiVO in sample 4 The mass percentage content is 3%. The catalyst is used in the photocatalytic water splitting hydrogen production process, and the hydrogen production reaches 329.5 μmol / g.

Embodiment 3

[0046] (1) BiVO 4 The preparation: with embodiment 1;

[0047] (2) SrTiO 3 The preparation: with embodiment 1;

[0048] (3) BiVO 4 / SrTiO 3 Preparation of Composite Photocatalyst

[0049] Accurately weigh 0.025g BiVO 4 Add to 30mL distilled water, stir at room temperature for 15min, ultrasonic for 15min; then add 0.475g SrTiO 3 , stirred for 15 min, ultrasonicated for 15 min, evaporated to dryness in a constant temperature water bath at 60 °C (about 3 h), and then transferred to a muffle furnace for calcination at 500 °C for 2 h to prepare BiVO 4 / SrTiO 3 composite photocatalyst. BiVO in sample 4 The mass percentage content is 5%. The catalyst is used in the photocatalytic water splitting hydrogen production process, and the hydrogen production reaches 611.6 μmol / g.

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Abstract

The invention discloses preparation of a BiVO4/SrTiO3 composite photocatalyst, and is mainly applied to the technology of photocatalytic hydrogen production from water decomposition. A preparation method of the BiVO4/SrTiO3 composite photocatalyst disclosed by the invention comprises the following steps: stirring BiVO4 and dispersing the BiVO4 in distilled water in an ultrasonic manner, then adding SrTiO3, stirring and processing in an ultrasonic manner; evaporating to dry the mixture in a water bath at a constant temperature of 40-60 DEG C; finally transferring into a muffle furnace, and calcining for 1-2 hours at a temperature of 450-500 DEG C to obtain the BiVO4/SrTiO3 composite photocatalyst. According to the preparation method disclosed by the invention, a hydrogen producing material SrTiO3 serves as a main body, and a heterojunction composite material is formed by compositing the SrTiO3 with the SrTiO3, so as to increase the migration rate of photoinduced electrons on a semiconductor BiVO4 interface, meanwhile the absorption range of the SrTiO3 in solar energy spectrum is widened, and therefore the performance of the SrTiO3 on photocatalytic hydrogen production from water decomposition is improved. Experimental results show that hydrogen production of the photocatalyst can reach 611.6mu mol/g in the process of hydrogen production from water decomposition.

Description

technical field [0001] The present invention relates to a BiVO 4 / SrTiO 3 The preparation method of the composite photocatalyst is mainly used in the technology of photocatalytic decomposition of water to produce hydrogen, and belongs to the field of composite material technology and the field of clean energy. Background technique [0002] In order to meet the current energy and environmental requirements in the world, semiconductor-based photocatalytic water splitting technology has been widely recognized. The key to this technology is to find photocatalysts with high activity and good stability. In recent years, researchers have developed a strong research interest in perovskite materials, and found that they have a wide range of applications not only in science but also in engineering. Among them, strontium titanate (SrTiO 3 ) is most in line with people's research requirements for catalysts: high catalytic activity, low price, good chemical stability, excellent physic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/22C01B3/04
CPCB01J23/22C01B3/042C01B2203/0277Y02E60/36Y02P20/133
Inventor 王其召张淑玲焦丹花白燕佘厚德王芳平
Owner NORTHWEST NORMAL UNIVERSITY
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