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Method for preparing carbon nano tube supported nano photocatalysis material capable of degrading nitrogen oxides

A nitrogen oxide and carbon nanotube technology, which is applied in the field of preparation of carbon nanotube-supported modified nano-photocatalytic materials, can solve the problems of low photocatalytic quantum generation rate and catalytic efficiency, limited catalytic effect, etc., and achieve excellent photocatalytic performance. Catalytic effect, photocatalytic efficiency improvement, effect of excellent photocatalytic function

Inactive Publication Date: 2011-06-22
ZHEJIANG UNIV
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  • Summary
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  • Claims
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Problems solved by technology

[0002] Since Fujishima proposed the "Hondo-Fujimoto" effect of semiconductor materials in 1972, the use of photocatalytic technology to degrade harmful liquids and gases that are stable at room temperature has become a research hotspot in the scientific community. Due to the low catalytic quantum generation rate and catalytic efficiency, the actual outdoor catalytic effect of existing photocatalytic materials is very limited, and photocatalytic materials must be modified

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) Put nano-titanium dioxide mixed crystals in water for ultrasonic dispersion for 25 minutes, then put them into 0.3mol / L AgNO3 solution, add part of ethanol and stir for 30 minutes;

[0015] (2) Continue to stir for 90 minutes under an ultraviolet lamp, and after filtering, place the filter residue at 400° C. for calcination for 2 hours to obtain modified nano-titanium dioxide mixed crystals;

[0016] (3) Mixing the modified nano-titanium dioxide mixed crystals and carbon nanotubes at a weight ratio of 1:0.01 for 2 hours to obtain a carbon nanotube-loaded modified nano-photocatalytic material capable of degrading nitrogen oxides.

[0017] The material can photocatalytically oxidize nitrogen dioxide gas with a concentration of 30ppm under simulated sunlight conditions (the light intensities of 254nm, 290nm, 365nm and 420nm are 4.2, 1.5, 19 and 165μW / cm2 respectively). The efficiency reached 73.3%, and after 7.5 hours of continuous reaction, the photocatalytic efficien...

Embodiment 2

[0019] (1) Put the nano-titanium dioxide mixed crystal in water for ultrasonic dispersion for 30 minutes, then put it into 0.5mol / L AgNO3 solution, add part of ethanol and then stir for 40 minutes;

[0020] (2) Place under an ultraviolet lamp and continue to stir for 90 minutes, and after filtering, place the filter residue at 450° C. for calcination for 4 hours to obtain a modified nano-titanium dioxide mixed crystal;

[0021] (3) Mixing the modified nano-titanium dioxide mixed crystals and carbon nanotubes at a weight ratio of 1:0.01 for 2 hours to obtain a carbon nanotube-loaded modified nano-photocatalytic material capable of degrading nitrogen oxides.

[0022] The material can photocatalytically oxidize nitrogen dioxide gas with a concentration of 30ppm under simulated sunlight conditions (the light intensities of 254nm, 290nm, 365nm and 420nm are 4.3, 1.5, 17 and 166μW / cm2 respectively). The efficiency reached 75.1%, and after 7.5 hours of continuous reaction, the photoc...

Embodiment 3

[0024] (1) Put the nano-titanium dioxide mixed crystal in water for ultrasonic dispersion for 30 minutes, then put it into 0.5mol / L AgNO3 solution, add part of ethanol and then stir for 40 minutes;

[0025] (2) Place under an ultraviolet lamp and continue to stir for 90 minutes, and after filtering, place the filter residue at 450° C. for calcination for 4 hours to obtain a modified nano-titanium dioxide mixed crystal;

[0026] (3) Mixing the modified nano-titanium dioxide mixed crystals and carbon nanotubes at a weight ratio of 1:0.015 for 4 hours to obtain a carbon nanotube-loaded modified nano-photocatalytic material capable of degrading nitrogen oxides.

[0027] The material can photocatalytically oxidize nitrogen dioxide gas with a concentration of 30ppm under simulated sunlight conditions (the light intensities of 254nm, 290nm, 365nm and 420nm are 4.3, 1.5, 18 and 167μW / cm2 respectively). The efficiency reached 76.5%, and after 7.5 hours of continuous reaction, the photo...

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Abstract

The invention discloses a method for preparing a carbon nano tube supported modified nano photocatalysis material capable of degrading nitrogen oxides, which comprises the following steps of: ultrasonically dispersing nano titanium dioxide mixed crystal in water for 20 to 30 minutes, then putting the dispersion into 0.3 to 0.5mol / L AgNO3 solution, adding partial ethanol and then stirring for 30 to 40 minutes; putting the solution under an ultraviolet lamp, continuously stirring the solution for 90 minutes, filtering, and calcining the filter residue for 2 to 3 hours at the temperature of between 400 and 450 DEG C to obtain modified nano titanium dioxide mixed crystal; and mixing the modified nano titanium dioxide mixed crystal and carbon nano tube for 2 to 4 hours in a ratio of 1:0.01-0.015 to obtain the carbon nano tube supported modified nano photocatalysis material capable of degrading the nitrogen oxides. The preparation process is simple; the prepared carbon nano tube supported modified nano photocatalysis material has better nitrogen oxide photocatalysis effect because of silver ion modification and nano carbon tube support, particularly the effect under visible light is obviously improved, and meanwhile, the long-term effectiveness of the photocatalysis effect is remarkably improved.

Description

technical field [0001] The invention relates to a preparation method of a carbon nanotube loaded modified nanometer photocatalytic material capable of degrading nitrogen oxides. Background technique [0002] Since Fujishima proposed the "Hondo-Fujimoto" effect of semiconductor materials in 1972, the use of photocatalytic technology to degrade harmful liquids and gases that are stable at room temperature has become a research hotspot in the scientific community. Due to the low catalytic quantum generation rate and catalytic efficiency, the actual outdoor catalytic effect of existing photocatalytic materials is very limited, and photocatalytic materials must be modified. At present, there have been many studies on modification treatment, such as doping modification with ions, especially rare earth metal elements, depositing inert noble metals such as Au, Pt, Ag on the surface, or coating the surface of photocatalytic materials with photosensitizers such as pigments. , Using p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/50B01J21/06B01J37/02B01D53/86B01D53/56
Inventor 孟涛钱晓倩江帆余靖吴侃胡衍镓朱蓬莱张津践徐庆磊
Owner ZHEJIANG UNIV
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