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Composite bismuth ferrite photocatalyst and preparation method and application thereof

A photocatalyst, bismuth ferrite technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problems of reducing the photocatalytic efficiency of catalysts and low utilization of sunlight, etc. The effect of improving the utilization rate of visible light, broadening the light response range, and improving the catalytic activity of visible light

Active Publication Date: 2017-06-09
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, BiFeO 3 As a photocatalyst, there are two major defects: First, BiFeO 3 The bandgap width is 2.1eV, only part of the visible light in sunlight can be used, and the utilization rate of sunlight is low
Second, electrons (e - ) and holes (h + ) are easy to recombine, reducing the photocatalytic efficiency of the catalyst

Method used

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  • Composite bismuth ferrite photocatalyst and preparation method and application thereof
  • Composite bismuth ferrite photocatalyst and preparation method and application thereof
  • Composite bismuth ferrite photocatalyst and preparation method and application thereof

Examples

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preparation example Construction

[0015] A kind of composite bismuth ferrite photocatalyst, preparation method comprises the steps:

[0016] 1) Synthesis of FeTiO by sol-gel method 3 Nanoparticles: drop the ferric nitrate solution into the ethanol solution of tetrabutyl titanate, stir magnetically, add sodium hydroxide solution until a dark brown precipitate is produced, wash with deionized water, dry, and calcinate in a muffle furnace at 400°C for 4h , to get FeTiO 3 nanoparticles.

[0017] 2) Synthesis of BiFeO by sol-gel method 3 Nanoparticles: Dissolve bismuth nitrate pentahydrate and iron nitrate nonahydrate in ethylene glycol, and stir the mixture magnetically for 30 minutes at room temperature to form a sol. After the sol is dried in an oven at 90°C, it is calcined in a muffle furnace at 450°C for 30 minutes. , after cooling, wash with distilled water and absolute ethanol, and dry to obtain BiFeO 3 nanoparticles.

[0018] 3) FeTiO 3 Place in deionized water, stir to obtain a suspension, add AgNO t...

Embodiment 1

[0020] 1) Synthesis of BiFeO by sol-gel method 3 Nanoparticles: Accurately weigh 7.7611g of bismuth nitrate pentahydrate and 6.4640g of ferric nitrate nonahydrate, and dissolve them in 36mL of ethylene glycol. At room temperature, the mixture was magnetically stirred for 30 min to form a sol. The sol was oven-dried at 90°C and calcined in a muffle furnace at 450°C for 30 min. After cooling, wash with distilled water and absolute ethanol several times, and dry to obtain BiFeO 3 nanoparticles.

[0021] 2) Synthesis of FeTiO by sol-gel method 3 Nanoparticles: drop 10mL of 1mol / L ferric nitrate solution into 10mL of 1mol / L tetrabutyl titanate ethanol solution, and stir magnetically for 3h. Add 1mol / L sodium hydroxide solution until a dark brown precipitate is produced, wash with deionized water, and dry. Calcined in a muffle furnace at 400°C for 4h to obtain FeTiO 3 nanoparticles.

[0022] 3) Take 1.0g of FeTiO prepared above 3 The powder was placed in 20mL deionized water...

Embodiment 2

[0024] 1) Synthesis of BiFeO by sol-gel method 3 Nanoparticles: the same as in Example 1.

[0025] 2) Synthesis of FeTiO by sol-gel method 3 Nanoparticles: the same as in Example 1.

[0026] 3) Take 1.0g of FeTiO prepared above 3 Put the powder in 20mL deionized water, stir to get a suspension, add 0.02g, 0.04g, 0.06g of AgNO 3 , avoid light and stir for 20min. Then, stir for 10 min under the irradiation of UV lamp, then add 1.0 g of BiFeO 3 Powder, ultrasonic 5min. After centrifugation, the resulting precipitate was washed with deionized water and dried. Finally, calcined in a muffle furnace at 400 °C for 30 min to obtain FeTiO 3 and BiFeO 3 Composite bismuth ferrite photocatalysts with a mass ratio of 1:1 and different Ag loadings (1%, 2%, 3%).

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Abstract

The invention relates to a composite bismuth ferrite photocatalyst and a preparation method and application thereof. The preparation method of Ag / FeTiO3 / BiFeO3 comprises the following steps: adding FeTiO3 to deionized water; stirring to obtain suspension; adding AgNO3 to the suspension; stirring for 20-30 minutes under a light-proof condition; then stirring for 10-20 minutes with the irradiating of an ultraviolet light; adding BiFeO3; ultrasonically dispersing; centrifugally separating; washing the obtained precipitate through deionized water; drying; and then roasting for 20-40 minutes through a muffle furnace at the temperature of 400-450 DEG C to obtain the target product. According to the preparation method, the BiFeO3 material is composited; antibiotics can be degraded through efficient photocatalyzing under the visible light effect.

Description

technical field [0001] The invention belongs to the field of photocatalysts, and in particular relates to the preparation of a composite bismuth ferrite photocatalyst by a sol-gel method and its application in catalytically degrading antibiotics in water under visible light. Background technique [0002] Water resources are the combination of the three systems of human beings, resources and the environment, and the material basis of all life activities, and play a pivotal role in social and economic development. With the development of human beings and the progress of society, people are increasingly aware of the importance of water resource protection to economic and social development. Due to the rapid and steady development of my country's pharmaceutical industry, the pharmaceutical industry has become a large discharge of industrial wastewater. More than 300 domestic enterprises produce more than 70 varieties of antibiotics, which account for 20%-30% of the world's outp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89C02F1/30C02F103/34
CPCC02F1/30B01J23/002B01J23/8973C02F2103/343C02F2305/10B01J2523/00B01J35/39B01J2523/47B01J2523/54B01J2523/842Y02W10/37
Inventor 张朝红唐建华纪剑峰刘逸伦孙意忱王君宋有涛
Owner LIAONING UNIVERSITY
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