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A method for photocatalytic degradation of perfluorooctanoic acid in water by 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 reduced photocatalytic efficiency, high recombination efficiency, ineffectiveness, etc., and achieves the effects of simple and easy operation, mild reaction conditions, and improved defluorination efficiency.

Active Publication Date: 2017-10-13
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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  • A method for photocatalytic degradation of perfluorooctanoic acid in water by noble metal doped gallium oxide
  • A method for photocatalytic degradation of perfluorooctanoic acid in water by noble metal doped gallium oxide
  • A method for photocatalytic degradation of perfluorooctanoic acid in water by 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 12.5g / L suspension, and ultrasonicate for 30min; add 0.6mL palladium chloride solution with a concentration of 0.1mol / 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, 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 ...

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, ultrasonic 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, a...

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Abstract

The invention belongs to the technical field of water treatment, and specifically relates to a method for photocatalytically degrading perfluorooctanoic acid in water doped with noble metal gallium oxide, comprising the following steps: preparing a noble metal doped gallium oxide catalyst and photocatalytically degrading perfluorooctanoic acid by using noble metal doped gallium oxide. Specifically, the noble metal salt solution is added to the gallium oxide suspension and mixed evenly, and then the reducing salt solution is added dropwise to reduce the metal particles on the gallium oxide surface to prepare a noble metal-doped gallium oxide photocatalyst, and then use the photocatalyst in the Degrade perfluorooctanoic acid under ultraviolet light, so as to achieve the purpose of removing perfluorooctanoic acid in water. The method of the invention has the advantages of simple photocatalyst preparation method, degrading perfluorooctanoic acid under normal temperature and pressure conditions, no need for complex devices and high degradation efficiency.

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 (PFOA) is a typical perfluorinated organic compound (Perfluorinated Compounds, PFCs), which has attracted extensive attention from all over the world in recent years. 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 chem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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