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Method for preparing platinum and nitrogen codoped active carbon supported titanium dioxide photocatalyst

A photocatalyst and titanium dioxide technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of low catalytic activity, achieve good degradation effect, solve the difficulty of recycling, and improve photocatalytic degradation rate effect

Inactive Publication Date: 2011-10-12
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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Problems solved by technology

[0005] In order to solve the existing technology of activated carbon loaded TiO 2 The ion-doped structure of the system has low catalytic activity in the field of liquid phase pollution. The present invention provides a method for preparing platinum and nitrogen co-doped activated carbon-supported titanium dioxide photocatalyst. The prepared activated carbon has good catalytic effect in visible light , can be applied in the field of liquid phase catalysis

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  • Method for preparing platinum and nitrogen codoped active carbon supported titanium dioxide photocatalyst
  • Method for preparing platinum and nitrogen codoped active carbon supported titanium dioxide photocatalyst

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preparation example Construction

[0021] The invention provides a method for preparing a platinum-nitrogen co-doped activated carbon-supported titanium dioxide photocatalyst for liquid dye decolorization in response to visible light, so as to solve the problems of low photocatalytic efficiency and photocatalyst recovery in the liquid phase. The specific steps are as follows:

[0022] 1) Add 12.5 mL tetrabutyl titanate to 45 mL absolute ethanol, slowly drop into 100 mL distilled water under vigorous stirring, add 10 mL acetylacetone and 2 mL polyethylene glycol at the same time, and adjust with 1 mol / L hydrochloric acid Until the pH is 2.0-3.0, stir vigorously for 2 hours to complete the hydrolysis and obtain a clear and transparent colloidal solution;

[0023] 2) The TiO prepared in 1) 2 Add 7.6 g of urea to the sol under magnetic stirring, react for 30 minutes, add activated carbon that has been washed and dried for 1 hour, continue to stir for 1 hour, sonicate for 20 minutes, filter after standing for 24 hou...

Embodiment 1

[0031] Add 12.5 mL of tetrabutyl titanate to 45 mL of absolute ethanol, slowly drop into 100 mL of distilled water under vigorous stirring, add 10 mL of acetylacetone and 2 mL of polyethylene glycol at the same time, and adjust the pH with 1 mol / L hydrochloric acid 2.0-3.0, vigorously stirred for 2 hours to complete the hydrolysis, and a clear and transparent sol was obtained. Then add 9.6 g of 6-10 mesh granular activated carbon and 7.6 g of urea at the same time, stir for 1 hour, then ultrasonicate for 20 minutes, clean the stain for 24 hours, filter, and wash several times with absolute ethanol and deionized water. The loaded activated carbon was dried at 120 °C for 2 h and calcined at 400 °C for 2 h to obtain nitrogen-doped activated carbon-supported nano-TiO 2 . Nitrogen-doped activated carbon-supported nano-TiO 2 After impregnating with chloroplatinic acid (weighed according to the mass fraction of Pt in the catalyst of 1%) solution by equal volume impregnation method,...

Embodiment 2

[0033] Add 12.5 mL of tetrabutyl titanate to 45 mL of absolute ethanol, slowly drop into 100 mL of distilled water under vigorous stirring, add 10 mL of acetylacetone and 2 mL of polyethylene glycol at the same time, and adjust the pH with 1 mol / L hydrochloric acid 2.0-3.0, vigorously stirred for 2 hours to complete the hydrolysis, and a clear and transparent sol was obtained. Then add 9.6 g of 6-10 mesh granular activated carbon and 7.6 g of urea at the same time, stir for 1 hour, then ultrasonicate for 20 minutes, clean the stain for 24 hours, filter, and wash several times with absolute ethanol and deionized water. The loaded activated carbon was dried at 120 °C for 2 h and calcined at 450 °C for 2 h to obtain nitrogen-doped activated carbon-supported nano-TiO 2 . Nitrogen-doped activated carbon-supported nano-TiO 2 After impregnating with chloroplatinic acid (weighed according to the mass fraction of Pt in the catalyst of 1%) solution by equal volume impregnation method,...

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Abstract

The invention discloses a method for preparing a platinum and nitrogen codoped active carbon supported titanium dioxide photocatalyst, which comprises the following steps of: adding tetrabutyl titanate into absolute ethanol, stirring for a period of time, slowing dripping into distilled water, adding acetylacetone and polyethylene glycol, regulating a pH value, and strongly stirring for complete hydrolysis to obtain a clear and transparent sol; adding urea with stirring, reacting, adding treated active carbon, continuously stirring, and performing ultrasonic dispersion, standing, filtration, washing, drying and roasting to obtain a nitrogen-doped active carbon supported TiO2 photocatalyst; immersing the nitrogen-doped active carbon supported TiO2 photocatalyst in a chloroplatinic acid solution, adding sodium borohydride for reduction, and drying to obtain a platinum and nitrogen codoped active carbon supported titanium dioxide photocatalyst. The invention solves the problem that a titanium dioxide catalyst in a suspension system is difficult to recover, the photocatalytic efficiency of the platinum and nitrogen codoped active carbon supported titanium dioxide photocatalyst on a liquid phase dye is further improved, and the platinum and nitrogen codoped active carbon supported titanium dioxide photocatalyst has stronger response under the condition of visible light.

Description

[0001] technical field [0002] The invention belongs to the technical field of preparation of activated carbon-supported catalysts, and mainly relates to a preparation method of a supported photocatalyst for decolorization of liquid dyes responsive to visible light. Background technique [0003] Semiconductor TiO 2 It is the most widely used photocatalyst at present, and has the advantages of non-toxicity, low cost and stable performance. However, TiO 2 It is a broadband semiconductor, and it has catalytic activity only under ultraviolet light that accounts for 3% to 4% of the sunlight on the earth's surface. At the same time, TiO 2 It also has the disadvantages of low catalytic activity for low-concentration pollutants, and the powder in the suspension system is easy to agglomerate and difficult to recycle. These shortcomings limit the use of TiO 2 practical application. If the TiO 2 Loaded on a porous carrier, it can play a synergistic role between adsorption and c...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30
Inventor 蒋剑春崔丹丹孙康卢辛成
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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