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Preparation of composite photoelectric catalytic material and method for treating unsymmetrical dimethylhydrazine wastewater

A technology of composite photocatalysis and unsymmetrical dimethylhydrazine, which is applied in catalyst activation/preparation, chemical instruments and methods, water treatment of special compounds, etc., can solve the problems of high cost of precious metals, complicated and limited preparation process, and achieve easy separation Recycling, accelerated reaction rate, and high photocatalytic efficiency

Active Publication Date: 2021-05-25
ROCKET FORCE UNIV OF ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The unsymmetrical dimethylhydrazine wastewater degradation photocatalyst announced by CN102626625B is noble metal-doped ZnO nanoparticles. In order to realize the photocatalytic reaction in the range of visible light, noble metals such as Ag, Pd, etc. are doped in the photocatalyst. However, the catalyst noble metal cost Expensive, and the nano powder photocatalyst is difficult to recover, difficult to reuse, and easy to cause secondary pollution
[0003]CN110639499A Prepared a Visible Light Modified Photocatalytic Material Bi2O3 / TiO by Plastic Calcination 2 / Al2O3, but the recycling process requires steps such as filtration and drying, and the powder is easy to fall off under the action of external force in the water environment
CN105951154A provides a preparation method for in-situ preparation of titanium dioxide nanotube array photocatalyst by anodic oxidation method, which improves the stability of photocatalytic materials and is successfully applied to the photocatalytic degradation of organic dye rhodamine B. CN1613556A uses titanium dioxide nanotube array As the substrate, by depositing graphene and noble metal modification, the degradation rate of 2,4-dichlorophenoxyacetic acid is up to 95.26%; however, the preparation cost of graphene and noble metal materials is high, and the degradation process of unsymmetrical dimethylhydrazine It is easy to produce toxic by-products, which limits its application in unsymmetrical dimethylhydrazine wastewater
In order to further improve the photocatalytic activity of the material, CN104628200A uses nano-ZnO as photocatalyst, boron-doped diamond as thin film electrode, stainless steel as cathode, carbon nanofiber and calcium alginate microspheres as filling particles to prepare three-dimensional electrode, providing a photoelectric combination A method for degrading organic pollutants such as unsymmetrical dimethylhydrazine, but there are problems of complex preparation process and high cost. The electrocatalytic oxidation of unsymmetrical dimethylhydrazine wastewater is still limited by ultraviolet light conditions, and 30% hydrogen peroxide needs to be added as an auxiliary catalyst

Method used

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  • Preparation of composite photoelectric catalytic material and method for treating unsymmetrical dimethylhydrazine wastewater
  • Preparation of composite photoelectric catalytic material and method for treating unsymmetrical dimethylhydrazine wastewater
  • Preparation of composite photoelectric catalytic material and method for treating unsymmetrical dimethylhydrazine wastewater

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Embodiment 1

[0040] A composite photocatalytic material is prepared by the following method:

[0041] The first step: preparing titanium dioxide nanotube array (TNAs) film substrate by anodic oxidation method. Cut high-purity titanium sheets (>99.99%) into small pieces of 1.5cm×4.5cm, and use 5%wt HNO 3 Chemically polish with 0.05%wt HF mixed solution, then ultrasonically treat with acetone, ethanol, and deionized water for 15min, put into a 0.1mol / LNaF solution with a pH value of 7 and contain 3%vol water for anodic oxidation sample preparation, The oxidation voltage was 40V, the electrode distance was 4cm, and the reaction time was 60min.

[0042] The second step: preparation of Bi by electrodeposition and calcination 2 o 3 / TNAs composite photocatalytic materials. Weigh an appropriate amount of Bi(NO 3 ) 3 Formulated with 0.01mol / L Bi 3+ solution, with the TNAs film substrate as the cathode and Pt as the anode, the voltage was set to 6.0V, the electrode spacing was 4cm, and the e...

Embodiment 2

[0044] The first step: preparing titanium dioxide nanotube array (TNAs) film substrate by anodic oxidation method. Cut high-purity titanium sheets (>99.99%) into small pieces of 1.5cm×4.5cm, and use 5%wt HNO 3 Chemically polish with 0.05%wt HF mixed solution, then ultrasonically treat with acetone, ethanol, and deionized water for 15min, put into a 0.2mol / LNaF solution with a pH value of 7 and contain 3%vol water for anodic oxidation sample preparation, The oxidation voltage was 40V, the electrode distance was 4cm, and the reaction time was 48min.

[0045] The second step: preparation of Bi by electrodeposition and calcination 2 o 3 / TNAs composite photocatalytic materials. Weigh an appropriate amount of Bi(NO 3 ) 3 Formulated with 0.04mol / L Bi 3+ solution, with the TNAs film substrate as the cathode and Pt as the anode, the voltage was set to 6.0V, the electrode spacing was 4cm, and the electrodeposition modification was carried out; the reaction time was controlled at ...

Embodiment 3

[0047] The first step: preparing titanium dioxide nanotube array (TNAs) film substrate by anodic oxidation method. Cut high-purity titanium sheets (>99.99%) into small pieces of 1.5cm×4.5cm, and use 5%wt HNO 3 Chemically polish with 0.05%wt HF mixed solution, then ultrasonically treat with acetone, ethanol, and deionized water for 15min, put into a 0.1mol / LNaF solution with a pH value of 7 and contain 3%vol water for anodic oxidation sample preparation, The oxidation voltage is 40V, the electrode distance is 4cm, and the reaction time is 55min.

[0048] The second step: preparation of Bi by electrodeposition and calcination 2 o 3 / TNAs composite photocatalytic materials. Weigh an appropriate amount of Bi(NO 3 ) 3 Formulated with 0.01mol / L Bi 3+ solution, with the TNAs film substrate as the cathode and Pt as the anode, the voltage was set to 6.0V, the electrode spacing was 4cm, and the electrodeposition modification was carried out; the reaction time was controlled to 10m...

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Abstract

The invention belongs to the field of photocatalysis, relates to a photocatalytic material and a method for electrically-assisted degradation of unsymmetrical dimethylhydrazine wastewater by using the photocatalytic material, and in particular relates to preparation of a composite photoelectric catalytic material by using a Bi2O3 / TiO2 nanotube array and a method for electrically-assisted degradation of the unsymmetrical dimethylhydrazine wastewater by using the composite photoelectric catalytic material. The composite material disclosed by the invention is high in photocatalytic effect, and under the assistance of bias potential, the separation efficiency (namely quantum efficiency) of photo-induced electron hole pairs of the composite material can be effectively improved, so that the photocatalytic activity is improved. The composite material for unsymmetrical dimethylhydrazine wastewater treatment is stable in performance, easy to recycle, simple in production process, low in cost, safe, environmentally friendly and free of secondary pollution, and has engineering application prospects.

Description

technical field [0001] The invention belongs to the field of electric-assisted photocatalysis, relates to a composite photocatalytic material and a method for treating unsymmetrical dimethylhydrazine wastewater, in particular to a method using Bi 2 o 3 / TiO 2 Nanotube array composite photocatalytic material and its electrical assisted treatment method for unsymmetrical dimethylhydrazine wastewater. Background technique [0002] As a propellant for launch vehicles, unsymmetrical dimethylhydrazine is widely used in equipment such as satellites and spacecraft. During the launch, engine testing, storage and transportation of spacecraft, a large amount of unsymmetrical dimethylhydrazine exhaust gas and waste water are usually produced. At present, photocatalytic technology has been applied to the wastewater treatment process of unsymmetrical dimethylhydrazine due to its advantages of greenness, environmental protection and low energy consumption. Photocatalytic materials mainly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/18B01J35/00B01J37/08B01J37/34C02F1/30C02F1/48C02F101/38
CPCB01J37/348B01J23/18B01J37/08C02F1/30C02F1/48C02F2101/38C02F2305/10B01J35/39Y02W10/37
Inventor 任向红周锋师金锋
Owner ROCKET FORCE UNIV OF ENG