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Carbon nanotube and {001}surface TiO2 microsphere composite material photocatalyst

A carbon nanotube, composite material technology, applied in physical/chemical process catalysts, other chemical processes, chemical instruments and methods, etc., can solve the problems of reducing the total removal efficiency of photocatalytic degradation rate, low specific surface area, application limitations, etc. Achieve the effect of broad environmental protection application potential

Active Publication Date: 2012-06-13
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the relatively low concentration of VOCs in the environment and the fact that TiO 2 The specific surface area is small, making TiO 2 The amount of adsorbed pollutants is less, thereby reducing the photocatalytic degradation rate and the final total removal efficiency, making the highly active {001} high-energy surface TiO 2 application is limited
However, there is no research on CNT and {001} TiO 2 Preparation of Microsphere Composite Photocatalyst and Its Application in Degradation of Volatile Organic Compounds

Method used

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  • Carbon nanotube and {001}surface TiO2 microsphere composite material photocatalyst
  • Carbon nanotube and {001}surface TiO2 microsphere composite material photocatalyst
  • Carbon nanotube and {001}surface TiO2 microsphere composite material photocatalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0028] (1) Add 0.5 g of multi-walled carbon nanotubes to 40 mL of concentrated hydrochloric acid and concentrated nitric acid with a volume ratio of 2:1, reflux at 100 ° C for 120 minutes, then filter and wash until the pH of the washing solution is 6, and The washed precipitate was dried at 100°C to obtain purified multi-walled carbon nanotubes;

[0029] (2) 0.05g of titanium tetrafluoride was added to 30mL of water, and fully stirred for 10 minutes to obtain a clear solution of titanium tetrafluoride;

[0030] (3) Add 0.2 g of the purified multi-walled carbon nanotubes obtained in step (1) to 20 mL of the titanium tetrafluoride clarified solution obtained in step (2), and ultrasonically disperse for 5 minutes to obtain a mixed solution;

[0031] (4) Put 10 mL of the mixed solution obtained in step (3) into a polytetrafluoroethylene tank, and conduct a hydrothermal reaction at 150° C. for 52 hours;

[0032] (5) After the solution in the tank is cooled, collect the sediment a...

Embodiment 2

[0042] (1) 0.5g double-walled carbon nanotubes are added to 60mL of concentrated hydrochloric acid and concentrated sulfuric acid with a volume ratio of 1:1, refluxed at 60°C for 180 minutes, then filtered and washed until the pH of the washing solution is 5, and the The washed precipitate was dried at 50°C to obtain purified double-walled carbon nanotubes;

[0043] (2) 0.01g of titanium tetrafluoride was added to 200mL of water, and fully stirred for 60 minutes to obtain a clear solution of titanium tetrafluoride;

[0044] (3) Add 1 g of the purified double-walled carbon nanotubes obtained in step (1) to 100 mL of the titanium tetrafluoride clarified solution obtained in step (2), and obtain a mixed solution after ultrasonic dispersion for 10 minutes;

[0045] (4) Put 10 mL of the mixed solution obtained in step (3) into a polytetrafluoroethylene tank, and conduct a hydrothermal reaction at 250° C. for 2 hours;

[0046] (5) After the solution in the tank is cooled, collect t...

Embodiment 3

[0048] (1) Add 2g of multi-walled carbon nanotubes to 100mL of concentrated hydrochloric acid and concentrated nitric acid with a volume ratio of 4:1, reflux at 80°C for 80 minutes, then filter and wash with water until the pH of the washing solution is 11, wash with water The final precipitate was dried at 80°C to obtain purified multi-walled carbon nanotubes;

[0049] (2) 0.08g of titanium tetrafluoride was added to 60mL of water, fully stirred for 6 minutes to obtain a clear solution of titanium tetrafluoride;

[0050] (3) Add 0.15 g of purified multi-walled carbon nanotubes obtained in step (1) to 45 mL of the titanium tetrafluoride clarified solution obtained in step (2), and obtain a mixed solution after ultrasonic dispersion for 12 minutes;

[0051] (4) Put 5 mL of the mixed solution obtained in step (3) into a polytetrafluoroethylene tank, and conduct a hydrothermal reaction at 120° C. for 42 hours;

[0052] (5) After the solution in the tank is cooled, collect the se...

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Abstract

The invention, belonging to the technical field of adsorption catalysis materials, discloses a carbon nanotube and {001}surface TiO2 microsphere composite material photocatalyst, its preparation method and application. The preparation method comprises the following steps: adding titanium tetrafluoride in water, fully stirring, and then adding nanotubes pretreated by acids, carrying out ultrasonicdispersion, carrying out hydro-thermal reaction in a teflon pot, collecting precipitates in the pot, cleaning in a centrifugal way, and drying to obtain the carbon nanotube and {001}surface TiO2 microsphere composite material photocatalyst. The photocatalyst has strong adsorption properties to volatile organic compounds and strong photocatalytic activity, so as to realize the integration of the absorption and photocatalytic oxidation of the volatile organic compounds, thus hydroxy radicals generated on the surface of the catalyst can be allowed to effectively mineralize and degrade the volatile organic compounds absorbed and gathered by the adsorption material in situ, and the reaction rate and efficiency of the photocatalytic oxidation of organic pollutants are greatly enhanced. The photocatalyst can be applied as an adsorbent or photocatalyst for the field of environmental protection.

Description

technical field [0001] The invention belongs to the technical field of adsorption catalytic materials, in particular to a carbon nanotube and {001} surface TiO 2 Microsphere composite photocatalyst material and its preparation method and application in the field of atmospheric environmental protection. Background technique [0002] Volatile organic compounds have brought us a lot of environmental problems and seriously threatened the safety of human life. More and more physical, chemical and biological technologies are used for the treatment of volatile organic compounds, among which photocatalytic oxidation technology can oxidize volatile organic compounds into CO in the presence of light irradiation and photocatalyst. 2 and H 2 O has received widespread attention. Among many photocatalysts, TiO 2 As a stable photocatalyst, it is used to deal with various environmental problems such as water and air purification problems. [0003] Both theoretical calculation and exper...

Claims

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Application Information

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IPC IPC(8): B01J21/18B01J20/20B01D53/86B01D53/72B01D53/02
CPCY02A50/20
Inventor 安太成陈江耀聂信黄勇李桂英
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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