Preparation method of nanoscale square flaky bismuth oxycarbonate photocatalyst

A technology of photocatalyst, bismuth oxycarbonate, which is applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., to achieve the effect of simple and easy preparation method and high photocatalytic activity of organic pollutants

Inactive Publication Date: 2014-05-07
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since this part of light only accounts for 5% of the solar spectrum irradiated on the ground, and the quantum efficiency of TiO2 is no higher than 28%, the overall utilization efficiency of solar energy is only about 1%, which is very low.

Method used

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  • Preparation method of nanoscale square flaky bismuth oxycarbonate photocatalyst
  • Preparation method of nanoscale square flaky bismuth oxycarbonate photocatalyst
  • Preparation method of nanoscale square flaky bismuth oxycarbonate photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] the solution Put it into a high-pressure reactor, seal it, react at 90°C for 48 hours, and cool to room temperature; centrifuge the solution in the high-pressure reactor to collect the precipitate, wash it with water and ethanol in turn, and dry it at 55°C for 6 hours to obtain a photocatalyst 1.

[0025] Figure 4 is the X-ray powder diffraction pattern of photocatalyst 1, and bismuth oxycarbonate (Bi 2 o 2 CO 3 ) standard card JCPDS-ICDD Card No. 41-1488, it can be seen that the sample is pure bismuth oxycarbonate. from figure 1 , figure 2 and image 3 It can be seen that the photocatalyst 1 is in the shape of a sheet with a thickness of about 100 nanometers and a cross section of a square with a side length of about 2 micrometers.

[0026] Example 2

Embodiment 2

[0028] the solution Put it into a high-pressure reactor, seal it, react at 200°C for 6 hours, and cool to room temperature; centrifuge the solution in the high-pressure reactor to collect the precipitate, wash it with water and ethanol in turn, and dry it at 65°C for 4 hours to obtain a photocatalyst 2.

[0029] Comparing the X-ray powder diffraction pattern of photocatalyst 2 with the bismuth oxycarbonate standard card JCPDS-ICDD Card No. 41-1488, it can be known that the sample is pure bismuth oxycarbonate. From the image of the scanning electron microscope of the photocatalyst 2, it can be seen that the photocatalyst 2 is sheet-shaped, with a thickness of about 100 nanometers, and a cross-section of a square with a side length of about 2 micrometers.

[0030] Example 3

Embodiment 3

[0032] the solution Put it into the autoclave, seal it, react at 150°C for 25 hours, and cool to room temperature; centrifuge the solution in the autoclave to collect the precipitate, wash it with water and ethanol in turn, and dry it at 60°C for 5 hours to obtain a photocatalyst 3.

[0033] Comparing the X-ray powder diffraction pattern of photocatalyst 3 with the bismuth oxycarbonate standard card JCPDS-ICDD Card No. 41-1488, it can be seen that the sample is pure bismuth oxycarbonate. From the image of the scanning electron microscope of the photocatalyst 3, it can be seen that the photocatalyst 3 has a sheet shape, a thickness of about 100 nanometers, and a cross section of a square with a side length of about 2 micrometers.

[0034] Embodiment 4 application effect

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Abstract

The invention provides a preparation method of a nanoscale square flaky bismuth oxycarbonate photocatalyst, and relates to the field of a catalyst. The preparation method comprises the following steps: sequentially dissolving a bismuth-containing compound, thiourea and carbonate in water, and adjusting pH value to 4-11, thus obtaining a mixed solution; putting the mixed solution in a high-pressure reaction kettle, sealing, reacting for 6-48 hours at the temperature of 90 DEG C-200 DEG C, and cooling to room temperature; and centrifuging the solution in the high-pressure reaction kettle, taking precipitates, washing and drying so as to obtain the nanoscale square flaky bismuth oxycarbonate photocatalyst. The nanoscale square flaky bismuth oxycarbonate photocatalyst has novel morphology and relatively high organic pollutant photocatalysis activity and is flaky, the thickness of the photocatalyst is about 100 nanometers, and the cross section of the photocatalyst is square with the side length being about 2 micrometers. The preparation method of the nanoscale square flaky bismuth oxycarbonate photocatalyst is simple and practicable; templates and surface active agents are not used in the preparation method; and the photocatalyst is low in price and easy to obtain.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a preparation method of a nanoscale square plate-shaped bismuth oxycarbonate photocatalyst. Background technique [0002] The sustainable development of human society and economy is increasingly facing the two major problems of energy shortage and environmental degradation. China, which is in the stage of accelerated urbanization and industrialization, has a particularly urgent demand for research and development of clean energy and environmental protection technologies. Theoretically, using solar energy to produce hydrogen energy at low cost is an ideal way to solve the above problems. In 1972, Japanese scientists such as Fujishima discovered TiO 2 Single crystal electrodes can realize photocatalytic water splitting (FujishimaA, 1972), and later discovered nano-TiO 2 Has the ability to photocatalytically degrade organic matter, TiO 2 It has become a research hotspot in the field of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/232A62D3/176A62D101/28
Inventor 滕飞常超陈敏东
Owner NANJING UNIV OF INFORMATION SCI & TECH
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