Method for preparing porous bismuth titanate photocatalyst

A photocatalyst and bismuth titanate technology, applied in the field of environmental science and engineering, can solve the problems of unsolvable catalyst separation, small particle size, etc., and achieve good industrial application prospects, mild reaction conditions, and low requirements for reaction devices.

Inactive Publication Date: 2008-03-26
BEIJING NORMAL UNIVERSITY
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  • Abstract
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Problems solved by technology

[0005] However, the above-mentioned bismuth titanate photocatalytic materials are all nano-powders with a small particle size, which still cannot solve the problem of catalyst separation from water bodies. Therefore, it is necessary to further improve its structure and morphology so that it can be better applied to water bodies. Purification area

Method used

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  • Method for preparing porous bismuth titanate photocatalyst
  • Method for preparing porous bismuth titanate photocatalyst
  • Method for preparing porous bismuth titanate photocatalyst

Examples

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Embodiment 1

[0028] 5 g of P123 block copolymer surfactant was dissolved in 50 ml of acetic acid (CH 3 COOH) to form a solution with a concentration of 100 grams per liter, add 17 grams of bismuth nitrate pentahydrate (Bi(NO 3 ) 3 ·5H 2 O), stirring constantly until completely dissolved, then adding 0.85 gram of tetrabutyl titanate (Ti(OC) dropwise 4 h 9 ) 4 ), the titanium / bismuth molar ratio is 1:14. Stir vigorously to form a homogeneous sol. After aging for 12 hours, move the aforementioned sol to an autoclave, crystallize at 150°C for 24 hours, take out the composite oxide gel precipitate, wash with deionized water, and evaporate and dry at 120°C to obtain titanium bismuth composite oxide things. The obtained precursor powder was calcined at a temperature of 550° C. for 3 hours in a normal-pressure air atmosphere to obtain a mesoporous bismuth titanate photocatalyst, which was designated as 1# sample. The sample was measured by the nitrogen adsorption-desorption specific surfac...

Embodiment 2

[0030]Dissolve 2.5 grams of F108 block copolymer surfactant in 50 milliliters of acetic acid to form a solution with a concentration of 50 grams per liter, add 17 grams of bismuth nitrate pentahydrate, stir continuously until completely dissolved, then add 0.71 grams of isopropyl titanate dropwise (Ti(OC 3 h 7 ) 4 ), the titanium / bismuth molar ratio is 1:14. Stir vigorously to form a homogeneous sol. After aging for 12 hours, the aforementioned sol was moved to an autoclave, crystallized at 140°C for 12 hours, the gel precipitate was taken out, washed, evaporated and dried at 140°C to obtain a titanium-bismuth composite oxide. The obtained precursor powder was calcined at a temperature of 550° C. for 3 hours in a normal-pressure air atmosphere to obtain a mesoporous bismuth titanate photocatalyst, which was designated as 2# sample. Its specific surface area is 25.4 square meters per gram, and its pore diameter is about 1.6 nanometers.

Embodiment 3

[0032] Dissolve 5 grams of P123 block copolymer surfactant in 50 milliliters of acetic acid to form a solution with a concentration of 100 grams per liter, add 17. grams of bismuth nitrate pentahydrate, stir continuously until completely dissolved, then add 0.88 grams of tetrabutyl titanate dropwise ester, at this time the molar ratio of titanium / bismuth is 1:13.5. Stir vigorously to form a homogeneous sol. After aging for 12 hours, the aforementioned sol was moved to an autoclave, crystallized at 150°C for 24 hours, the composite oxide gel precipitate was taken out, washed, evaporated and dried at 130°C to obtain a titanium-bismuth composite oxide. The obtained precursor powder was calcined at a temperature of 550° C. for 3 hours in a normal-pressure air atmosphere to obtain a mesoporous bismuth titanate photocatalyst, which was designated as 3# sample. Its specific surface area is 20.2 square meters per gram, and its pore diameter is about 1.7 nanometers.

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Abstract

The present invention belongs to the field of environmental science and engineering technology, in the concrete, it relates to a preparation method of new-type mesopore bismuth titanate photacatalyst for degrading organic pollutant. Said method includes the following steps: using bismuth nitrate and titanate as main raw material, using block interpolymer surfactant as structure guide agent, adopting acetic acid as hydrolysis catalyst, utilizing solvent thermal synthesis method to prepare titanium-bismuth composite oxide gel, making said gel undergo the processes of filtering, drying, high-temperature calcining and crystallizing so as to obtain the mesopore bismuth titanate material with photocatalytic activity.

Description

technical field [0001] The invention belongs to the field of environmental science and engineering disciplines, in particular to a method for preparing a mesoporous bismuth titanate photocatalyst used for photocatalytically degrading organic pollutants. Background technique [0002] In recent years, semiconductor photocatalysis technology has been widely used in environmental protection and hydrogen production by photolysis of water. The commonly used photocatalyst is anatase titanium oxide, but due to the wide band gap of titanium oxide, it can only be excited by ultraviolet light with a wavelength less than 386.5nm. If an ultraviolet lamp is used as a photocatalytic light source, a lot of energy will be wasted; in addition At present, the titanium oxide nanopowder particles that are widely used at present are too small. If it is used for water purification, it is not easy to separate and recover from the water. Therefore, the development of new semiconductor photocatalyst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/18B01J21/06C02F1/30
CPCY02W10/37
Inventor 沈珍瑶殷立峰牛军峰张哲赟
Owner BEIJING NORMAL UNIVERSITY
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