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Bismuth ferrite microsphere photocatalyst with hollow structure and preparation method thereof

A photocatalyst, bismuth ferrite technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. problems such as small surface area, to achieve the effect of improving catalytic activity, simple preparation process and large specific surface area

Inactive Publication Date: 2010-08-04
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But TiO 2 The disadvantages of photocatalytic plates are: 1. Due to the differences of various substrates, TiO 2 The adhesion of the film is not good, and it is easy to fall off during use; the photocatalytic efficiency is reduced, which restricts the popularization and application of photocatalytic technology; 2. TiO 2 The life of the photocatalytic plate is short; 3. The production process is complicated
Since the currently prepared BiFeO 3 Catalyst technology has the disadvantages of large catalyst particle size and small specific surface area, which is not conducive to the adsorption of pollutant molecules on the catalyst surface, making it difficult to improve the photocatalytic activity; at the same time, some methods in the prior art use toxic substances such as methoxyethanol. Solvents that pollute the environment

Method used

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  • Bismuth ferrite microsphere photocatalyst with hollow structure and preparation method thereof
  • Bismuth ferrite microsphere photocatalyst with hollow structure and preparation method thereof
  • Bismuth ferrite microsphere photocatalyst with hollow structure and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0037] At 20°C, a mixture of bismuth nitrate, ferric nitrate and citric acid with a molar ratio of 1:1:1 was dissolved in a solution containing 10.0 mL glycerin and 30.0 mL ethanol, and a clear dark red solution could be obtained after 360 W ultrasound for 10 minutes . Move it into a 50ml hydrothermal kettle, then put it in an oven at 160°C for aging; take out the hydrothermal kettle after 24 hours, filter the precipitate; wash with absolute ethanol for 6 times, and put it in an oven at 80°C Dry for 12 hours; place the obtained product in a muffle furnace, raise the temperature to 500° C. at a rate of 2° C. / min, and keep it for 4 hours to obtain the target product of bismuth ferrite microspheres with uniform particle size and hollow structure.

[0038] figure 1 For the X-ray diffraction spectrum of the preparation product of the present embodiment, can determine that gained product is BiFeO from the spectrum 3 . figure 2 Prepare the nitrogen absorption-desorption isotherm ...

Embodiment 2

[0040] At 20°C, a mixture of bismuth nitrate, ferric nitrate and citric acid with a molar ratio of 1:1:1 was dissolved in a solution containing 10.0 mL glycerin and 30.0 mL ethanol, and a clear dark red solution could be obtained after 360 W ultrasound for 10 minutes . Move it into a 50ml hydrothermal kettle, then put it in an oven at 160°C for aging; take out the hydrothermal kettle after 6 hours, filter the precipitate; wash with absolute ethanol for 6 times, and put it in an oven at 80°C Dry for 12 hours; place the obtained product in a muffle furnace, raise the temperature to 500° C. at a rate of 2° C. / min, and keep it for 4 hours to obtain the target product of bismuth ferrite microspheres with uniform particle size and hollow structure.

[0041] It can be confirmed that the obtained product is BiFeO by X-ray diffraction pattern 3 . Nitrogen absorption-desorption isotherm can determine the specific surface area of ​​the product obtained is 16.4m 2 / g; The photo shows t...

Embodiment 3

[0043] At 20°C, a mixture of bismuth nitrate, ferric nitrate and citric acid with a molar ratio of 1:1:1 was dissolved in a solution containing 10.0 mL glycerin and 30.0 mL ethanol, and a clear dark red solution could be obtained after 360 W ultrasound for 10 minutes . Move it into a 50ml hydrothermal kettle, then put it in an oven at 160°C for aging; take out the hydrothermal kettle after 12 hours, filter the precipitate; wash with absolute ethanol for 6 times, and put it in an oven at 80°C Dry for 12 hours; place the obtained product in a muffle furnace, raise the temperature to 500° C. at a rate of 2° C. / min, and keep it for 4 hours to obtain the target product of bismuth ferrite microspheres with uniform particle size and hollow structure.

[0044] It can be confirmed that the obtained product is BiFeO by X-ray diffraction pattern 3 . From the nitrogen absorption-desorption isotherm, it can be determined that the specific surface area of ​​the product obtained is 18.0m ...

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Abstract

The invention belongs to a catalyst technology which relates to a bismuth ferrite microsphere photocatalyst with a hollow structure and a preparation method thereof. The defects of large grain diameter of a catalyst, small specific surface area, poor adsorption of the molecules of a pollutant and small photocatalytic activity exist in the prior art. The molecular formula of the bismuth ferrite microsphere photocatalyst with the hollow structure is BiFeO3, the grain diameter is 1.0 to 2.0mum, the thickness of the ball wall is 100 to 200nm, and the specific surface area is 7.2 to 28.1m2 / g. The preparation method comprises the following steps of: dissolving bismuth salt and ferric salt into a mixed alcohol solution of absolute ethyl alcohol and glycerol, adding citric acid and mixing evenly; dispersing by ultrasonic sound, putting into a stainless steel hydrothermal kettle and carrying out thermal ageing by a solvent; and drying an ageing product and calcining to prepare the bismuth ferrite microsphere photocatalyst with the hollow structure. The invention has the advantages that raw materials are cheap and are easy to obtain; the preparation process is simple; the bismuth ferrite microsphere photocatalyst has uniform grain diameter and large specific surface area; the photocatalytic activity is enhanced; and the catalyst can be repeatedly used.

Description

technical field [0001] The invention belongs to catalyst technology, in particular to a hollow bismuth ferrite microsphere photocatalyst and a preparation method thereof. Background technique [0002] With the advancement of science and technology and the development of the chemical industry, some refractory organic compounds have also been produced. The wide application of various preservatives, insecticides, herbicides, etc. has promoted industrial and agricultural production, but it has also caused certain harm to the natural ecological environment. Certain toxic organic substances have a strong inhibitory effect on microorganisms, and some also seep into groundwater through the soil, posing a threat to people's normal life. Some even have toxic effects on microorganisms, resulting in the inability to effectively degrade them by biological methods. For the organic wastewater that pollutes the environment, people try to use various methods to treat it. At present, people...

Claims

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Application Information

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IPC IPC(8): B01J23/843B01J35/08A62D3/10A62D101/28
Inventor 霍宇凝金轶张亚李和兴
Owner SHANGHAI NORMAL UNIVERSITY
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