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Preparation method of defect-state titanium oxide-aluminum oxide-graphene ceramic electrode

A ceramic electrode, titanium oxide technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of poor post-processing, low mechanical strength, high preparation cost, and improve toughness and preparation cost. The effect of low, wide potential window

Active Publication Date: 2020-02-18
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] The present invention is made in view of the above-mentioned problems in the prior art. The primary purpose of the present invention is to provide a solution for the problems of low mechanical strength, poor toughness, poor post-processability, and easy passivation of the surface of the defective titanium oxide pressed electrode. A highly conductive, corrosion-resistant defective titanium oxide ceramic electrode material; the secondary purpose of the present invention is to provide a method for preparing a defective titanium oxide-alumina-graphene ceramic electrode, while improving the preparation cost of the current defective titanium oxide electrode Defects such as high, complex process, and production hazards caused by high-temperature hydrogen-facing operations

Method used

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  • Preparation method of defect-state titanium oxide-aluminum oxide-graphene ceramic electrode

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Embodiment 1

[0045] The following steps are taken to prepare defective titanium oxide-alumina-graphene ceramic electrodes:

[0046] (1) According to the material ratio (weight ratio) of 65:25:10:2:0.025, mix aluminum oxide, titanium oxide, zinc, zinc oxide and graphene solid powder (wherein aluminum oxide, titanium oxide, zinc, zinc oxide powder Particle diameters are 3μm, 5μm, 200nm, 20nm) to obtain a homogeneous mixture;

[0047] (2) Mix the above mixture with a polyacrylamide binder with a mass fraction of 0.5% and ball mill it for 6 hours to make ceramic powder, then granulate the obtained ceramic powder, and control the moisture content of the particles to 5% (weight ratio) , the particle size is 40-80 mesh;

[0048] (3) At 1000kg / m 2 The ceramic particles are made into a ceramic slab with a thickness of 5mm in the mold under a certain pressure;

[0049] (4) heat-treat the ceramic base plate at 80° C. for 24 hours to remove moisture and organic binder in the base;

[0050] (5) Sin...

Embodiment 2

[0055] Specific application method of defective titanium oxide-alumina-graphene ceramic electrode

[0056] Taking the treatment of alkali slag wastewater with defective titanium oxide-alumina-graphene ceramic electrodes as an example, take 1L of alkali residue wastewater from a chemical plant and place it in a flat electrocatalytic reactor, and use defective titanium oxide-alumina-graphene The ceramic electrode is used as the anode, and the stainless steel electrode is used as the cathode. The distance between the cathode and the anode is controlled to be 10mm, and the current density is 20mA / cm 2 , DC pulse electrolytic treatment of alkali slag wastewater for 60 minutes, sampling and analysis of COD concentration in water, the results are as follows image 3 As shown, the COD removal rate is 95.8%.

Embodiment 3

[0058] Another specific method of using the defective titanium oxide-alumina-graphene ceramic electrode

[0059] Taking the treatment of aniline wastewater with defective titanium oxide-alumina-graphene ceramic electrodes as an example, take 500mL of aniline wastewater from a chemical plant and place it in a flat electrocatalytic reactor, and use defective titanium oxide-alumina-graphene ceramic electrodes As the anode, the stainless steel electrode is the cathode, the distance between the cathode and the anode is controlled to be 15mm, and the current density is 40mA / cm 2 , DC pulse electrolytic treatment of aniline wastewater for 60 minutes, sampling and analysis of COD and ammonia nitrogen concentration in the water, the results are as follows Figure 4 As shown, the removal rate of COD is 96.2%, and the removal rate of ammonia nitrogen is 92.7%.

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Abstract

The invention discloses a preparation method of a defect-state titanium oxide-aluminum oxide-graphene ceramic electrode. The method comprises the following steps: (1) weighing and fully mixing aluminum oxide, titanium oxide, zinc, zinc oxide and graphene solid powder according to a certain ratio to obtain a uniform mixture; (2) mixing, ball-milling and granulating the mixture and a binder, and pressing into a polar plate with a specific size; (3) carrying out heat treatment and high-temperature sintering treatment on the formed polar plate; and (4) carrying out fluorination treatment on the sintered polar plate, and drying to obtain the defect-state titanium oxide-aluminum oxide-graphene ceramic electrode. The in-situ oxygen defect construction technology is adopted, and the obtained electrode is high in electrical conductivity, good in stability and large in electrochemical active area and can be used for large-scale industrial wastewater deep treatment.

Description

technical field [0001] The invention relates to the technical field of electrochemistry and environmental water treatment, in particular to a method for preparing a defective titanium oxide-alumina-graphene ceramic electrode. Background technique [0002] In the oxidation technology of environmental water treatment, electrocatalytic oxidation is an important technology choice. For the electrocatalytic process, the choice of anode material is at the core. The activity and stability of the anode material not only directly affect the rate and effect of the water treatment process, but also seriously affect the energy consumption, reactor design and maintenance difficulty. [0003] Electrocatalytic anodes used in industrial water treatment processes must have three basic conditions: high stability, high catalytic activity, and low cost. Specifically, they should have good performance in the following aspects: [0004] (1) Stable mechanical properties, under the condition of a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F101/38C02F101/16
CPCC02F1/46109C02F2001/46133C02F2101/16C02F2101/38
Inventor 代云容段存戌王思宇朱繁高航
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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