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Preparation method and application of single-phase bismuth titanate nano-material

A single-phase bismuth titanate and nanomaterial technology, applied in the fields of nanomaterials and environmental science and engineering, can solve the problems of harsh synthesis conditions and high synthesis temperature, and achieve the effects of low equipment cost, good regeneration performance and simple process

Active Publication Date: 2010-10-20
浙江绿色德环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Through the introduction of the above-mentioned prior art, we find that the existing synthesized bismuth titanate photocatalyst is mainly an impure phase, and the synthesis temperature in the existing method is relatively high, due to Bi 20 TiO 32 The synthesis conditions are harsh and metastable. Except for the high-temperature quenching method, there is no other single-phase Bi with high solar photocatalytic activity synthesized under mild conditions. 20 TiO 32 Report on Nano Photocatalytic Materials

Method used

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  • Preparation method and application of single-phase bismuth titanate nano-material

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Embodiment 1

[0034] Weigh 8.0g bismuth nitrate (Bi(NO 3 ) 3 ·5H 2 O) join in the acetic acid, make the molar ratio of bismuth / carboxylate be 1: 55, stir continuously until the bismuth nitrate dissolves completely and then add tetrabutyl titanate dropwise therein, make the molar ratio of titanium / bismuth be 1: 10, After continuing to stir to obtain a clear solution, inject the structure-directing agent benzyl alcohol into it, so that the molar ratio of bismuth / alcohol is 1:3, and finally add urea to the above solution, so that the molar ratio of bismuth / urea is 1:1.5, and then stir until the solution is clear Transparent. Inject the prepared solution into 220mL ethanol solvent, mix evenly, move it into a high-pressure reactor, heat it to 200°C under the protection of 12bar nitrogen and keep it for 6h to completely hydrolyze or alcoholyze the bismuth nitrate, then open the vent valve to discharge solvent to obtain dry Bi 20 TiO 32 The precursor of nanomaterials, and then wash the precur...

Embodiment 2

[0036] Weigh 8.0g bismuth nitrate (Bi(NO 3 ) 3 ·5H 2 O) Add in formic acid, make bismuth / carboxylate molar ratio be 1: 40, stir continuously until bismuth nitrate dissolves completely, then add tetraisopropyl titanate dropwise therein, make titanium / bismuth molar ratio be 1: 13 After continuing to stir to obtain a clear solution, inject structure-directing agent p-nitrobenzyl alcohol therein so that the bismuth / alcohol mol ratio is 1:4, and finally add urea to the above-mentioned solution so that the mol ratio of bismuth / urea is 1:2.2, Then stir until the solution is clear and transparent. Inject the prepared solution into 200mL of methanol solvent, mix it evenly, transfer it into a high-pressure reactor, and heat it to 235°C under the protection of 10bar nitrogen for 4 hours to completely hydrolyze or alcoholyze the bismuth nitrate, then open the vent valve to discharge solvent to obtain dry Bi 20 TiO 32 The precursor of nanomaterials, and then wash the precursor with et...

Embodiment 3

[0038] Weigh 10.0g bismuth nitrate (Bi(NO 3 ) 3 ·5H 2 O) join in propionic acid, make bismuth / carboxylate molar ratio be 1: 70, stir continuously until bismuth nitrate dissolves completely, then add tetrabutyl titanate dropwise therein, make titanium / bismuth molar ratio be 1: 8 After continuing to stir to obtain a clear solution, inject the structure-directing agent phenylethyl alcohol into it so that the molar ratio of bismuth / alcohol is 1:3, and finally add urea to the above solution so that the mol ratio of bismuth / urea is 1:3.5, and then stir until The solution is clear and transparent. Inject the prepared solution into 250mL propanol solvent, mix evenly, move it into a high-pressure reactor, and heat it to 240°C under the protection of 11bar nitrogen for 3 hours to completely hydrolyze or alcoholyze the bismuth nitrate, and then open the vent valve Drain the solvent to obtain dry Bi 20 TiO 32 The precursor of nanomaterials is washed three times with ethanol and deion...

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Abstract

The invention discloses a preparation method and application of a single-phase bismuth titanate nano-material. The single-phase nano-material with the formula Bi20TiO32 which can not be easily obtained through conventional synthesis is prepared in a supercritical method with soluble bismuth salts and titanate as main raw materials, the crystalline state of the nano-material is good, and the image obtained by the transmission electron microscope shows that the nano-material is of a sheet-shaped nano structure with holes. The method for synthesis of the single-phase Bi20TiO32 nano-material has the advantages of low cost, mild reaction conditions, high yield, easy large-scale production in the industry and the like. The Bi20TiO32 nano-material obtained in the method shows high photocatalytic activity in the experiment of catalytic degradation of common organic pollutants under the sunlight. Moreover, the catalyst has high regenerability and still has good catalytic performance after being repeatedly used for eight times. Therefore, the catalyst has high industrial practicality.

Description

technical field [0001] The invention relates to the fields of nanomaterials and environmental science and engineering, in particular to a preparation method and application of a single-phase bismuth titanate nanomaterial with photocatalytic degradation activity of organic pollutants under sunlight. Background technique [0002] One of the important goals in the field of energy and environment in the 21st century is to treat or restore the ecological environment by using renewable energy and new environmentally friendly functional materials, and to maximize the use efficiency of new environmentally friendly functional materials. Semiconductor photocatalysis technology will undoubtedly play an important role in this field. At present, semiconductor photocatalysis technology has shown broad application prospects in the fields of environmental protection, photodegradation hydrogen production, and photocatalytic sterilization. Among them, TiO 2 As a relatively mature semiconducto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/18B01J21/06B01J37/00
Inventor 胡军成周腾飞魏仁杰
Owner 浙江绿色德环保科技股份有限公司
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