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Method for nano-scale gallium oxide vacuum-ultraviolet photocatalytic degradation of perfluorooctanic acid

A technology of vacuum ultraviolet light and perfluorooctanoic acid, which is applied in the field of water treatment, can solve the problems of reduced catalyst activity, high price of precious metals, and difficulty in popularization and use, and achieves the effects of improving conversion efficiency, reducing preparation cost and improving efficiency.

Inactive Publication Date: 2018-07-10
嘉兴市众盛环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The above method improves the catalytic activity of gallium oxide by loading precious metals, but precious metals are expensive and difficult to popularize and use, and there is a problem that the surface of precious metals is prone to carbon deposition, which leads to a decrease in catalyst activity; the gallium oxide used is a commodity with a small specific surface area and active sites Less, poor overall catalytic activity

Method used

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  • Method for nano-scale gallium oxide vacuum-ultraviolet photocatalytic degradation of perfluorooctanic acid
  • Method for nano-scale gallium oxide vacuum-ultraviolet photocatalytic degradation of perfluorooctanic acid

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Embodiment 1

[0028] 1) Mix water and ethylenediamine at a volume ratio of 50:1, add gallium nitrate to the above mixture to prepare a 0.2mol / L gallium nitrate solution, and adjust the pH to 9.5 with ammonia water;

[0029] 2) Put the above liquid in a hydrothermal reaction kettle, seal it, place it in a constant temperature drying oven, heat it at 180°C, and react for 3 hours, take out the reaction kettle and cool it to room temperature, centrifuge the product in the reaction kettle to obtain a precipitate, and use After washing with deionized water, the resulting precipitate was dried in an oven at 60 °C for 4 h to obtain nano-sized β-Ga 2 o 3 Precursor spare;

[0030] 3) Put the above precursors in a muffle furnace, raise the temperature to 800°C at a rate of 2°C / min under a nitrogen atmosphere, and roast at a constant temperature for 3 hours to obtain nano-sized β-Ga 2 o 3 Materials, the materials are self-made nano-scale gallium oxide photocatalysts after being ground through a 400-...

Embodiment 2

[0036]1) Mix water and ethylenediamine at a volume ratio of 40:1, add gallium nitrate to the above mixture to prepare a 0.25mol / L gallium nitrate solution, and adjust the pH to 9.0 with ammonia water;

[0037] 2) Put the above liquid in a hydrothermal reaction kettle, seal it, place it in a constant temperature drying oven, heat it at 200°C, and react for 2 hours, take out the reaction kettle and cool it to room temperature, centrifuge the product in the reaction kettle to obtain a precipitate, and use After washing with deionized water, the resulting precipitate was dried in an oven at 70 °C for 3 h to obtain nano-sized β-Ga 2 o 3 Precursor spare;

[0038] 3) Put the above precursors in a muffle furnace, raise the temperature to 900°C at a rate of 3°C / min under a nitrogen atmosphere, and roast at a constant temperature for 3 hours to obtain nano-sized β-Ga 2 o 3 Materials, the materials are self-made nano-scale gallium oxide photocatalysts after being ground through a 400-...

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Abstract

The invention discloses a method for nano-scale gallium oxide vacuum-ultraviolet photocatalytic degradation of perfluorooctanic acid. The method comprises preparation of a nano-scale beta-Ga2O3 photocatalyst and photocatalytic degradation of perfluorooctanic acid based on the nano-scale beta-Ga2O3 photocatalyst. Through use of an ethylenediamine solution as an additive, the gallium salt forms bunchy nano-scale beta-Ga2O3 and has a specific surface area of 30-50 m<2> / g 3-5 times that of the commercial gallium oxide. The larger specific surface area means that more catalytic active sites are exposed so that the catalytic material has better catalytic activity. The method uses vacuum ultraviolet light as a light source, which has higher chemical energy with photogenerated electrons generatedby the catalytic material, and gallium oxide is used as a semiconductor material in the deep ultraviolet region and has a stronger absorption capacity for vacuum ultraviolet light, so that perfluorooctanoic acid can be degraded efficiently.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and specifically relates to a method for photocatalytically degrading perfluorooctanoic acid, a persistent organic pollutant in water, by synthesizing nano-scale gallium oxide material and using the material as a catalyst, and using vacuum ultraviolet light as a light source. Background technique [0002] Perfluorooctanoic acid (PFOA, C 7 f 15 COOH) is a synthetic perfluoroacid compound (Perfluorocarboxylic acid, PFCAs), which has high chemical stability, hydrophobicity, thermal stability and bioaccumulation, and has been widely used in the production of consumer goods and industrial production. Wide range of applications. PFOA is mainly discharged into the environment through industrial production, and further transferred in the environment. Due to its stability, persistence and bioaccumulation, it continues to accumulate in the environment. However, PFOA has numerous physiological to...

Claims

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Application Information

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IPC IPC(8): C02F1/32B01J23/08B01J35/10C02F101/36
CPCC02F1/32B01J23/08C02F2305/10C02F2101/36B01J35/613B01J35/39
Inventor 沈炜
Owner 嘉兴市众盛环保科技有限公司
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