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Nanometer, composite semiconductor photocatalyst, and its prepn. method

A nano-composite, photocatalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. The effect of forming new phase with new phase, improving catalytic efficiency and improving stability

Inactive Publication Date: 2006-06-28
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For a long time, nano-titanium dioxide composite photocatalysts have become an effective measure to improve photocatalytic quantum efficiency and expand the response wavelength range of photocatalysts. The energy transfer efficiency (that is, the catalytic ability under visible light) needs to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Mix 0.03Mol cadmium nitrate, 1.2Mol deionized water, 0.03Mol sodium 6-metaphosphate, slowly drop 0.03Mol sodium sulfide into the above mixed solution, and stir vigorously, adjust the temperature of the mixed solution to 80℃ in a water bath After stirring for 30 minutes, add dilute nitric acid to adjust the PH value to 5. The original clear and transparent liquid gradually turns pale yellow to orange.

[0021] The obtained sol is centrifuged at a high speed (16000 rpm), washed with three deionized water followed by three alcohol washes, and dried under vacuum at 50° C. for 24 hours to obtain cadmium sulfide nanopowder.

[0022] Disperse 0.01Mol cadmium sulfide nano-powder into 30mL absolute ethanol. After stirring for 30min, put the container in a 90℃ water bath, set the frequency to 20kHz and the surface power to 100W / cm 2 The probe of the ultrasonic generator is immersed in the suspension. At the same time, dissolve 0.01Mol butyl titanate (analytical grade) in 30mL of abso...

Embodiment 2

[0025] Mix 0.03Mol cadmium sulfate, 1Mol deionized water, 0.03Mol sodium dodecyl sulfonate, slowly drop 0.03Mol potassium sulfide into the above mixed solution, and stir vigorously. Adjust the temperature of the mixed solution to 80 in a water bath. After stirring for 30 minutes at ℃, add dilute nitric acid to adjust the PH value to 4, the original clear and transparent liquid gradually turns pale yellow to orange.

[0026] The obtained sol is centrifuged at a high speed (16000 rpm), washed with three deionized water followed by three alcohol washes, and dried under vacuum at 50° C. for 24 hours to obtain cadmium sulfide nanopowder.

[0027] Disperse 0.01Mol cadmium sulfide nanopowder into 30mL toluene, stir for 30min, put the container in a 90℃ water bath, set the frequency to 20kHz and the power density to 1000W / cm 2 The probe of the ultrasonic generator is immersed in the suspension. At the same time, dissolve 0.02Mol butyl titanate (analytical grade) in 30mL absolute ethanol, ...

Embodiment 3

[0031] Mix 0.03Mol cadmium nitrate, 0.3Mol deionized water, 0.015Mol sodium dodecyl sulfonate, slowly drop 0.03Mol potassium selenide into the above mixed solution, and stir vigorously. The water bath adjusts the temperature of the mixed solution After stirring at 80°C for 30 minutes, add dilute nitric acid to adjust the PH value to 4, the original clear and transparent liquid gradually turns pale yellow to orange.

[0032] The obtained sol was centrifuged at a high speed (16000 rpm), washed with three deionized water followed by three alcohol washings, and dried under vacuum at 50° C. for 24 hours to obtain cadmium selenide nano-powder.

[0033] Disperse 0.01Mol cadmium selenide nanopowder into 30mL absolute ethanol, put the container in a 70℃ water bath after stirring for 30min, set the frequency to 20kHz and the power density to 800W / cm 2 The probe of the ultrasonic generator is immersed in the suspension. At the same time, dissolve 0.03Mol titanium tetrachloride (analytical gr...

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Abstract

A nano-class semiconductor-type composite catalyst is a semiconductor nano-particle consisting of the sulfide or selenide as core and the coated TiO2 layer as shell. Its preparing process includes such steps as preparing high-dispersity cadmium sulfide (or selenide) nano-particles by wet chemical method and surfactant modifying, ultrasonic hydrolysis of the organic alkoxide of Ti to obtain TiO2, and physical combination between TiO2 and codmium sulfide (or selenide) nano-particles. It has high photocatalytic activity and stability.

Description

Technical field [0001] The invention relates to a semiconductor composite body, in particular to a nano composite semiconductor photocatalyst with a core-shell structure of titanium dioxide wrapped with sulfide or selenide and a preparation method. Background technique [0002] In recent decades, nanocomposite semiconductors have been a research hotspot, especially the second type of nanocomposite semiconductors, whose energy level is characterized in that the energy band and valence band of one semiconductor are higher than the energy band of the other semiconductor in the composite. The sum valence band, under the excitation of an external light source, the excited electrons on the conduction band of a semiconductor with a small forbidden band relax to the conduction band of a wide band gap semiconductor. Similarly, under the action of an external field, positive charge holes It is also enriched in the valence band of narrow bandgap semiconductors. Obviously, the space charge i...

Claims

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Application Information

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IPC IPC(8): B01J27/04B01J27/057B01J37/02
Inventor 王智宇张福安樊先平钱国栋王民权
Owner ZHEJIANG UNIV
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