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Method for photocatalytic degradation of PFOA (perfluorooctanoic acid) in water through noble-metal-doped gallium oxide

A technology of perfluorooctanoic acid and gallium oxide, which is applied in the field of water treatment, can solve the problems of reducing photocatalytic efficiency, ineffectiveness and high recombination efficiency, and achieves the effects of simple and easy operation, improved defluorination efficiency and mild reaction conditions

Active Publication Date: 2015-11-18
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Under light conditions, gallium oxide is excited to generate electron-hole pairs, and the holes and electrons will undergo redox reactions with organic substances adsorbed on the surface of gallium oxide, but the recombination efficiency of electron-hole pairs is high, which makes it ineffective. Therefore, to slow down the recombination of photogenerated electrons and holes and improve the photocatalytic activity of gallium oxide has become the primary content of research.

Method used

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  • Method for photocatalytic degradation of PFOA (perfluorooctanoic acid) in water through noble-metal-doped gallium oxide
  • Method for photocatalytic degradation of PFOA (perfluorooctanoic acid) in water through noble-metal-doped gallium oxide
  • Method for photocatalytic degradation of PFOA (perfluorooctanoic acid) in water through noble-metal-doped gallium oxide

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Example 1 : Platinum-doped gallium oxide (Pt-Ga 2 o 3 ) catalyst preparation and use of its photocatalytic degradation of perfluorooctanoic acid

[0028] Commodity gallium oxide (Ga 2 o 3 ) was dried at 105°C for 1h, and 0.5g of the dried Ga 2 o 3 Add deionized water into the beaker to form a 12.5g / L suspension, and ultrasonicate for 30min; add 3.1mL of chloroplatinic acid solution with a concentration of 0.02mol / L to the suspension, and stir for 1h; then add 2.5mL dropwise to a concentration of 0.5 mol / L potassium borohydride solution, continue to stir for 30 minutes to reduce metal platinum on the gallium oxide, filter the above mixed solution, and dry the precipitate at 105°C for 12 hours to obtain a doping amount of 1%. Pt-Ga 2 o 3 Photocatalyst, ready for use after grinding.

[0029] Measure 180mL of perfluorooctanoic acid solution with a concentration of 30mg / L in the photoreactor, add 0.09g of the above Pt-Ga 2 o 3 Catalyst, aerated with nitrogen, and...

Embodiment 2

[0031] Example 2: Palladium-doped gallium oxide (Pd-Ga 2 o 3 ) catalyst preparation and use of its photocatalytic degradation of perfluorooctanoic acid

[0032] Commodity gallium oxide (Ga 2 o 3 ) was dried at 105°C for 1h, and 0.5g of the dried Ga 2 o 3 Add deionized water into the beaker to form a suspension of 12.5g / L, and ultrasonicate for 30min; add 0.6mL of palladium chloride solution with a concentration of 0.1mol / L to the suspension, and stir for 1h; then add 2.5mL of 0.5 mol / L potassium borohydride solution, continue to stir for 30 minutes, so that metal palladium is reduced and supported on gallium oxide, the above-mentioned mixed solution is suction-filtered, and the precipitate is dried at 105°C for 12 hours to obtain a doping amount of 1%. Pd-Ga 2 o 3 Photocatalyst, ready for use after grinding.

[0033] Measure 180mL of perfluorooctanoic acid solution with a concentration of 30mg / L in the photoreactor, add 0.09g of the above Pd-Ga 2 o 3 Catalyst, aera...

Embodiment 3

[0035] Example 3: Silver-doped gallium oxide (Ag-Ga 2 o 3 ) catalyst preparation and use of its photocatalytic degradation of perfluorooctanoic acid

[0036] Commodity gallium oxide (Ga 2 o 3 ) was dried at 105°C for 1h, and 0.5g of the dried Ga 2 o 3 Add deionized water into the beaker to make a suspension of 12.5g / L, ultrasonicate for 30min; add 0.6mL silver nitrate solution with a concentration of 0.1mol / L to the suspension, stir for 1h; then add 2.5mL dropwise to a concentration of 0.5 mol / L potassium borohydride solution, continue to stir for 30 minutes, so that metallic silver is reduced and supported on gallium oxide, the above mixed solution is suction-filtered, and the precipitate is dried at 105°C for 12 hours to obtain Ag with a doping amount of 1%. -Ga 2 o 3 Photocatalyst, ready for use after grinding.

[0037] Measure 180mL of perfluorooctanoic acid solution with a concentration of 30mg / L in the photoreactor, add 0.09g of the above Ag-Ga 2 o 3 Catalyst...

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Abstract

The invention belongs to the technical field of water treatment, and particularly relates to a method for photocatalytic degradation of PFOA (perfluorooctanoic acid) in water through noble-metal-doped gallium oxide. The method comprises steps as follows: preparation of a noble-metal-doped gallium oxide catalyst and photocatalytic degradation of the PFOA through the noble-metal-doped gallium oxide catalyst. Specifically, a noble metal salt solution is added to a gallium oxide suspension for full and even mixing, then a reducing salt solution is added dropwise, metal particles are reduced and loaded onto the surface of gallium oxide, the noble-metal-doped gallium oxide photocatalyst is prepared, and then the PFOA is degraded in the presence of ultraviolet light by the aid of the photocatalyst, so that the PFOA in the water is removed. The method has the advantages that the photocatalyst preparation method is simple, the PFOA is degraded under normal temperature and normal pressure conditions, no complex device is required, and the degradation efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and specifically relates to the synthesis of a noble metal-doped gallium oxide material and a method for photocatalytically degrading perfluorooctanoic acid, a persistent organic pollutant in water, using the material as a catalyst and ultraviolet light as a light source. Background technique [0002] Perfluorooctanoic acid (Perfluorooctanoic Acid, PFOA) is a typical perfluorinated organic compounds (Perfluorinated Compounds, PFCs), in recent years by the world's extensive attention. PFOA has excellent stability and hydrophobic and oleophobic properties, and is widely used in industrial production and consumer products, including fireproof films, floor polishes, shampoos, leather products, foam fire extinguishing agents, pesticides, paint additives, insecticides, etc. It is also used as a surface protection material in the fields of carpet, leather, paper and textile. Due to its chemical...

Claims

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Application Information

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IPC IPC(8): C02F1/32C02F1/70B01J23/62B01J23/66C02F101/36
Inventor 喻泽斌刘晴胡晓李明洁
Owner GUANGXI UNIV
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