Process for preparing bismuth silicate nano powder and use

A technology of nano-powder and bismuth silicate, which is applied in the direction of chemical instruments and methods, silicon compounds, bismuth compounds, etc., can solve the problems that there are no relevant literature reports on nano-powder, achieve good application prospects, simple process flow, excellent The effect of photocatalytic activity

Inactive Publication Date: 2006-08-23
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] So far, about Bi 12 SiO 20 There is no relevant literature r

Method used

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  • Process for preparing bismuth silicate nano powder and use
  • Process for preparing bismuth silicate nano powder and use
  • Process for preparing bismuth silicate nano powder and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 0.12mol bismuth nitrate pentahydrate (Bi(NO 3 ) 3 ·5H 2 O) dissolved in 180ml glacial acetic acid (CH 3 COOH), and then dropwise added 0.01mol tetraethoxysilane ((C 2 h 5 O) 4 Si), while adding 60ml ethylene glycol dimethyl ether (CH 3 OCH 2 CH 2 OH) as a co-solvent to adjust the viscosity of the solution, fully stirred to form a uniform sol. The aforementioned sol was evaporated and dried at 150° C. to obtain a precursor powder. The resulting precursor powder was sintered at 650 °C under normal pressure for 0.75 hours to obtain Bi 12 SiO 20 Nano powder.

Embodiment 2

[0034] 0.12mol bismuth acetate (Bi(CH 3 COO) 3 ) was dissolved in 60ml absolute ethanol (CH 3 CH 2 OH), then add 0.01mol tetrapropoxysilane ((C 3 h 7 O) 4 Si), fully stirred to form a uniform sol. The aforementioned sol was evaporated and dried at 250° C. to obtain a precursor powder. The resulting precursor powder was sintered at 550 °C under normal pressure for 1.5 hours to obtain Bi 12 SiO 2 0 nanometer powder.

Embodiment 3

[0036] 0.12mol bismuth carbonate (Bi(CO 3 ) 3 ) dissolved in 100ml anhydrous isopropanol ((CH 3 ) 2 CHOH), then add 0.01mol tetramethoxysilane ((CH 2 O) 4 Si), while adding 20ml ethylene glycol dimethyl ether (CH 3 OCH 2 CH 2 OH) as a co-solvent to adjust the viscosity of the solution, fully stirred to form a uniform sol. The aforementioned sol was evaporated under negative pressure at 100° C. with a vacuum degree of -0.1 MPa to obtain a precursor powder. The resulting precursor powder was sintered at 700 °C under normal pressure for 0.5 hours to obtain Bi 12 SiO 20 Nano powder.

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Abstract

The present invention relates to preparation process and application of nanometer Bi12SiO20 powder. The preparation process of nanometer Bi12SiO20 powder includes the first dissolving Bi salt in one solvent to form Bi containing solution of Bi salt concentration 0.5-5 M, adding organic Si compound in the Bi/Si molar ratio of 12 into the Bi containing solution to form homogeneous sol through full stirring, evaporating the sol at normal or negative pressure to obtain dry precursor powder, and final sintering the precursor powder in aerobic condition to obtain the nanometer Bi12SiO20 powder. The present invention realizes the homogeneous mixing of initial materials in molecular size, so as to prepare nanometer Bi12SiO20 powder with high purity and high crystallization degree in relatively low temperature and relatively short time. The nanometer Bi12SiO20 powder has high photocatalytic activity and may be used in photocatalysis to degrade one pollutant.

Description

technical field [0001] The present invention relates to a kind of bismuth silicate (Bi 12 SiO 20 ) The preparation method of the nanometer powder, the prepared bismuth silicate nanometer powder can be used as a photocatalyst, and belongs to the technical field of material science photocatalyst. Background technique [0002] Bismuth silicate (Bi 12 SiO 20 ) crystal belongs to the cubic crystal system, I23 point group, γ-Bi 2 o 3 structure. It has superior electro-optic, photoconductive, photorefractive and piezoelectric effects, and has broad application prospects in optoelectronics, optical information storage, optical computing and other fields. [0003] At present, the method of growing bismuth silicate single crystal both at home and abroad is to adopt the method of pulling from the molten liquid. The method is to use high-purity Bi 2 o 3 and SiO 2 The powder is used as a raw material, mixed at a molar ratio of 6:1, melted at a high temperature of about 900°C, a...

Claims

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Application Information

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IPC IPC(8): C01G29/00C01B33/20
Inventor 顾明元贺持缓
Owner SHANGHAI JIAO TONG UNIV
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