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Preparation method and application of three-dimensional ordered macro-porous alpha-Fe2O3/graphene aerogel electrode

A graphene airgel, three-dimensional ordered technology, applied in chemical instruments and methods, water/sewage treatment, light water/sewage treatment, etc., can solve the problems of low quantum efficiency, photocatalytic activity limitation, etc., and achieve high ratio Surface area, increased degradation efficiency, improved mass transport effects

Inactive Publication Date: 2019-06-14
XIAN TECHNOLOGICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its quantum efficiency is low and the photocatalytic activity is limited

Method used

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  • Preparation method and application of three-dimensional ordered macro-porous alpha-Fe2O3/graphene aerogel electrode
  • Preparation method and application of three-dimensional ordered macro-porous alpha-Fe2O3/graphene aerogel electrode
  • Preparation method and application of three-dimensional ordered macro-porous alpha-Fe2O3/graphene aerogel electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step 1. Preparation of graphene airgel:

[0031] Ultrasonic disperse the graphene oxide to obtain a graphene oxide dispersion, the concentration of the graphene oxide dispersion is 12 mg / L, adjust the pH to 9 with ammonia water, ultrasonically disperse for 2 hours, add 0.2 mL EDTA after ultrasonication, stir evenly, and continue ultrasonication for 4 hours h, after the ultrasonication, react the uniformly dispersed mixture at 180 °C for 14 h to obtain a graphene hydrogel, place it in 50 mL of low-concentration ethanol solution for solvent replacement, let it stand for 6 h, and store it at -10 °C Cool down for 12 h and dry naturally for 24 h to obtain graphene airgel (GA);

[0032] Step 2. Self-assembly of polystyrene hard template:

[0033] A monodisperse polystyrene microsphere emulsion with a diameter of 500 nm and a mass concentration of 0.5% was placed in distilled water, the volume ratio of the emulsion to deionized water was 0.5:3, and ultrasonically dispersed fo...

Embodiment 2

[0037] Step 1. Preparation of graphene airgel:

[0038] Ultrasonic disperse the graphene oxide to obtain a graphene oxide dispersion, the concentration of the graphene oxide dispersion is 12 mg / L, adjust the pH to 9 with ammonia water, ultrasonically disperse for 2 h, add 0.2 m L EDTA after ultrasonication, stir evenly, and continue ultrasonication 4 h, after the end of ultrasonication, the uniformly dispersed mixture was reacted at 180 °C for 14 h to obtain a graphene hydrogel, which was placed in 50 mL of low-concentration ethanol solution for solvent replacement, allowed to stand for 6 h, and cooled at -10 Cool at ℃ for 12 h, and dry naturally for 24 h to obtain graphene airgel (GA);

[0039] Step 2. Self-assembly of polystyrene hard template:

[0040] A monodisperse polystyrene microsphere emulsion with a diameter of 500 nm and a mass concentration of 0.5% was placed in distilled water, the volume ratio of the emulsion to deionized water was 0.5:3, and ultrasonically disp...

Embodiment 3

[0044] Step 1. Preparation of graphene airgel:

[0045] Ultrasonic disperse the graphene oxide to obtain a graphene oxide dispersion, the concentration of the graphene oxide dispersion is 12 mg / L, adjust the pH to 9 with ammonia water, ultrasonically disperse for 2 hours, add 0.2 mL EDTA after ultrasonication, stir evenly, and continue ultrasonication for 4 hours h, after the ultrasonication, react the uniformly dispersed mixture at 180 °C for 14 h to obtain a graphene hydrogel, place it in 50 mL of low-concentration ethanol solution for solvent replacement, let it stand for 6 h, and store it at -10 °C Cool down for 12 h and dry naturally for 24 h to obtain graphene airgel (GA);

[0046] Step 2. Self-assembly of polystyrene hard template:

[0047] A monodisperse polystyrene microsphere emulsion with a diameter of 500 nm and a mass concentration of 0.5% was placed in distilled water, the volume ratio of the emulsion to deionized water was 0.5:3, and ultrasonically dispersed fo...

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Abstract

The invention belongs to the technical field of water treatment new materials, and particularly relates to a preparation method and application of a three-dimensional ordered macro-porous alpha-Fe2O3 / graphene aerogel electrode. The preparation method comprises the following steps: I, preparing graphene aerogel; II, performing self-assembly of a polystyrene hard template; III, preparing the three-dimensional ordered macro-porous alpha-Fe2O3 / graphene aerogel electrode through high temperature calcining. The three-dimensional ordered macro-porous alpha-Fe2O3 / graphene aerogel electrode obtained bythe invention has a three-dimensional ordered macro-porous structure which provides a good channel for improving material transmission and lowering mass transfer resistance. The three-dimensional macro-porous structure can also improve the light absorbing efficiency through multiple scattering and the slow light effect, and the photocatalytic capability can be improved to further accelerate the circulation of iron ions in order to realize further improvement of Fenton activity of alpha-Fe2O3.

Description

technical field [0001] The invention belongs to the technical field of new materials for water treatment, in particular to a low-cost, high-elastic three-dimensional ordered macroporous α-Fe 2 o 3 Preparation method and application of graphene airgel electrode. Background technique [0002] With the rapid development of the dye industry, dye wastewater has become an important issue in environmental problems. Electro-Fenton (EF) oxidation technology, which uses air as a green way to continuously supply oxygen, does not need to add chemical reagents, and the reaction solution will not produce secondary pollution and can efficiently degrade toxic and harmful substances has become a research hotspot in the field of wastewater treatment one. [0003] The efficiency of electro-Fenton degradation of pollutants mainly depends on the generation of H by the cathode material 2 o 2 ability and the activity of Fenton catalysts. [0004] The traditional homogeneous electro-Fenton te...

Claims

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Application Information

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IPC IPC(8): C02F1/30C02F1/461C02F1/467C02F101/30
Inventor 王宇晶宋荷美陈建赵菁刘改燕
Owner XIAN TECHNOLOGICAL UNIV
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