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Method for degrading PFOA (perfluorooctanoic acid) in water by using Pt-doped In2O3 photocatalysis

A technology of photocatalysis and photocatalysis, which is applied in the field of water treatment, can solve the problems of reduced photocatalytic efficiency, high electron-hole pair recombination efficiency, and inability to react, achieve broad application prospects, improve light absorption capacity, and be easy to operate line effect

Active Publication Date: 2016-12-14
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Under light conditions, In 2 o 3 The electron-hole pairs are excited, and the holes and electrons will be adsorbed on the In 2 o 3 The organic matter on the surface undergoes a redox reaction, but the recombination efficiency of electron-hole pairs is high, which makes it unable to effectively react with the organic matter, thereby reducing the photocatalytic efficiency

Method used

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  • Method for degrading PFOA (perfluorooctanoic acid) in water by using Pt-doped In2O3 photocatalysis
  • Method for degrading PFOA (perfluorooctanoic acid) in water by using Pt-doped In2O3 photocatalysis
  • Method for degrading PFOA (perfluorooctanoic acid) in water by using Pt-doped In2O3 photocatalysis

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A Pt-doped In 2 O 3 The method for photocatalytic degradation of PFOA in water comprises the steps:

[0028] Add 0.2g In 2 O 3 Add 40 mL of deionized water to form a 5 g / L suspension, sonicate for 20 min, add 0.72 mL of 0.02 mol / L H 2 PtCl 6 The solution was stirred for 15 min, and then 0.27 mL of formic acid was added in proportion as a hole-trapping agent; the mixture was placed under a 254 nm ultraviolet lamp for 3 h to make the 2+ Revert to Pt simple substance, the light process is accompanied by N 2 Aeration is used to remove dissolved oxygen in water; after the light is finished, the precipitate is separated, washed with deionized water several times and dried to prepare Pt-doped In with a doping amount of 1at%. 2 O 3 Photocatalyst, ready for use after grinding.

[0029] The PFOA solution that concentration is 10mg / L is placed in the cylindrical quartz container that has cooling jacket, adjusts pH=3, adds the Pt doped In that 90mg step (1) prepares 2 O 3...

Embodiment 2

[0031] A Pt-doped In 2 O 3The method for photocatalytic degradation of PFOA in water comprises the steps:

[0032] Add 0.2g In 2 o 3 Add 40 mL of deionized water to form a 5 g / L suspension, sonicate for 20 min, add 1.44 mL of 0.02 mol / L H 2 PtCl 6 The solution was stirred for 15 min, and then 0.54 mL of formic acid was added in proportion as a hole-trapping agent; the mixture was placed under a 254 nm ultraviolet lamp for 3 h to make the 2+ Revert to Pt simple substance, the light process is accompanied by N 2 Aeration is used to remove dissolved oxygen in water; after the light is finished, the precipitate is separated, washed with deionized water several times and dried to prepare Pt-doped In with a doping amount of 2at%. 2 o 3 Photocatalyst, ready for use after grinding.

[0033] Concentration is that the PFOA solution of 20mg / L is placed in the cylindrical quartz container that has cooling jacket, adjusts pH=3, adds the Pt doped In that 90mg step (1) prepares 2 o ...

Embodiment 3

[0035] A Pt-doped In 2 o 3 The method for photocatalytic degradation of PFOA in water comprises the steps:

[0036] Add 0.2g In 2 o 3 Add 40 mL of deionized water to form a 5 g / L suspension, sonicate for 20 min, add 3.6 mL of 0.02 mol / L H 2 PtCl 6 The solution was stirred for 15 min, and then 1.3 mL of formic acid was added in proportion as a hole-trapping agent; the mixture was placed under a 254 nm ultraviolet lamp for 3 h to make the 2+ Revert to Pt simple substance, the light process is accompanied by N 2 Aeration is used to remove dissolved oxygen in water; after the light is finished, the precipitate is separated, washed with deionized water several times and dried to prepare Pt-doped In with a doping amount of 5at%. 2 o 3 Photocatalyst, ready for use after grinding.

[0037] Concentration is that the PFOA solution of 40mg / L is placed in the cylindrical quartz container that has cooling jacket, adjusts pH=3, adds the Pt doped In that 90mg step (1) prepares 2 o ...

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Abstract

The invention belongs to the technical field of water treatment, and particularly relates to a method for degrading PFOA (perfluorooctanoic acid) in water by using Pt-doped In2O3 photocatalysis. The method comprises the following steps: preparing a Pt-doped In2O3 catalyst by a photoreduction process, and degrading the PFOA by using Pt-doped In2O3 photocatalysis. The doped Pt can be used as an electron storage spot to effectively transfer photogenerated electrons generated on In2O3, and can prevent the photogenerated electrons and holes from compounding, thereby enhancing the PFOA defluorination efficiency; and the photocatalytic defluorination efficiency of the Pt-doped In2O3 for PFOA is 2-4 times of that of the In2O3. The Pt is doped in the In2O3 to greatly enhance the optical absorptivity of the In2O3, so that the In2O3 has high absorptivity for 350nm+ light, thereby being beneficial to implementing utilization of the clean energy-sunlight energy.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to a Pt-doped In 2 O 3 The preparation of the photocatalytic material and the method for photocatalytically degrading the persistent organic pollutant PFOA in water by using the material as a catalyst and using 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. production. Due to its chemical inertness and its widespread production and use, PFOA has caused serious environmental accumul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/32C02F1/72B01J23/62C02F101/36
CPCC02F1/32C02F1/725B01J23/62B01J37/16B01J37/345C02F2305/10C02F2101/36B01J35/39
Inventor 喻泽斌刘晴李明洁胡晓张搏朱有慧匡瑜
Owner GUANGXI UNIV
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