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Nanometer gallium oxide and application thereof

A gallium oxide, nanotechnology, applied in the fields of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as the need to improve catalytic activity, limit the application of catalysts, reduce the activity and life of catalysts, and achieve rapid Effective degradation effect

Inactive Publication Date: 2013-05-08
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The study found that a wide-bandgap semiconductor, gallium oxide, has higher photocatalytic activity for perfluorocarboxylic acids than TiO 2 , but the overall catalytic activity still needs to be improved
In addition, when applied to the degradation of perfluorocarboxylic acids in wastewater, the organic matter in the wastewater will be adsorbed on the surface of the catalyst, reducing the activity and life of the catalyst, which greatly limits the application of the catalyst

Method used

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  • Nanometer gallium oxide and application thereof
  • Nanometer gallium oxide and application thereof
  • Nanometer gallium oxide and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Example 1: Synthesis of Fan-shaped Nanostructure Gallium Oxide by Hydrothermal Method

[0051] The preparation of fan-shaped nano gallium oxide: according to gallium nitrate hydrate (Ga(NO 3 ) 3 wxya 2 O), polyvinyl alcohol (PVA) and water in a mass ratio of 20:1:200 are mixed to form a solution. Without adjusting the pH, the solution was heated in a water bath at 90°C for 10 minutes. Then transfer the obtained product to a sealed polytetrafluoroethylene hydrothermal kettle, place it in a constant temperature drying oven, heat it at 200°C for a period of time, take out the hydrothermal kettle, cool it to room temperature, and centrifuge the product in the kettle. The washed and dried powder is placed in a tube furnace, calcined at 700° C. for a period of time under nitrogen atmosphere, and finally the obtained product is naturally cooled.

[0052] figure 1 It is the XRD pattern of the product obtained after heating the hydrothermal product at 700°C for 2 hours. Fr...

Embodiment 2

[0055] Example 2: Synthesis of acicular nanostructure gallium oxide by hydrothermal method

[0056] Preparation of acicular nano-gallium oxide: according to gallium nitrate hydrate (Ga(NO 3 ) 3 wxya 2 O), polyvinyl alcohol (PVA) and water are mixed in a mass ratio of 20:1:200 to form a solution. The pH was adjusted to 6.4 and the solution was heated in a water bath at 90°C for 10 minutes. Then transfer the obtained product to a sealed polytetrafluoroethylene hydrothermal kettle, place it in a constant temperature drying oven, heat it at 200°C for a period of time, take out the hydrothermal kettle, cool it to room temperature, and centrifuge the product in the kettle. The washed and dried powder is placed in a tube furnace, calcined at 700° C. for a period of time under nitrogen atmosphere, and finally the obtained product is naturally cooled.

[0057] Figure 4 It is the XRD pattern of the product obtained after heating the hydrothermal product at 700°C for 2 hours. From...

Embodiment 3

[0060] Example 3: Degradation of perfluorocarboxylic acid by fan-shaped gallium oxide combined with vacuum ultraviolet light

[0061] The photocatalytic degradation of perfluorocarboxylic acid in pure water or wastewater is carried out. The catalyst used is fan-shaped gallium oxide, and the dosage is 0.5g / L. The reaction is carried out in a ring-tube glass photoreactor. An ordinary 14W low-pressure mercury lamp capable of emitting 254nm ultraviolet light (hereinafter referred to as "UV light") and a 14W special low-pressure mercury lamp capable of emitting 185nm vacuum ultraviolet light (hereinafter referred to as "VUV light") were used as light sources. The light source is placed in the middle of the photoreactor and separated from the reaction solution by a quartz sleeve. During the reaction process, the gas is uniformly distributed through the sieve plate at the bottom of the reactor and then enters the reaction solution, and is discharged from the exhaust hole on the upper...

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Abstract

The invention aims to provide a nanometer gallium oxide with high catalytic activity to perfluorocarboxylic acids and application of the nanometer gallium oxide. The nanometer gallium oxide is prepared by the following steps of: (1) solving gallium nitrate hydrate in water, and adding a surface regulating agent; (2) heating the prepared solution in the step (1) in water bath; (3) placing products prepared in the step (2) in a hydrothermal kettle, and heating under constant temperature; and (4) sintering the product of the hydrothermal kettle in the step (3) to finally obtain the nanometer gallium oxide product. According to the nanometer gallium oxide and the application thereof, disclosed by the invention, the prepared product is combined with ultraviolet rays of 185nm / 25nm so that the efficiency of degrading the perfluorocarboxylic acids in different water can be improved, and the perfluorocarboxylic acids in the water can be effectively removed.

Description

technical field [0001] The invention belongs to photocatalysis technology, belongs to the technical field of environmental persistent organic pollutants control, and specifically relates to a synthesis of nano-gallium oxide and using the nano-gallium oxide as a catalyst, using vacuum ultraviolet light as a light source, to photocatalytically decompose water and waste water. Trace amounts of perfluorocarboxylic acids. Background technique [0002] Perfluorocarboxylic acids are a new class of organic pollutants that are ubiquitous in the environment, persistent, bioaccumulative, and biotoxic. Many studies at home and abroad have shown that perfluorocarboxylic acids widely exist in nature, can be ingested by organisms through breathing and food chains, and are finally enriched in the blood, liver, kidney, and brain of organisms. Reproductive toxicity, neurotoxicity, developmental toxicity, and endocrine disrupting effects are considered to be a class of environmental pollutant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G15/00B82Y30/00B01J23/08
Inventor 张彭义邵田金玲李振民张博
Owner TSINGHUA UNIV
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