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High-specific-surface-area super-hydrophilic gradient boron-doped diamond electrode and preparation method and application thereof

A diamond electrode, high specific surface area technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of BDD material pollution, water pollution, high equipment requirements, etc.

Active Publication Date: 2020-08-28
NANJING DAIMONTE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of method is complex in process, requires high equipment and will introduce shelter materials during the etching process, causing pollution to BDD materials, especially high-temperature catalytic metal ion etching technology, which may introduce harmful ions of heavy metals such as nickel ions into water bodies in the later stage , causing water pollution

Method used

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  • High-specific-surface-area super-hydrophilic gradient boron-doped diamond electrode and preparation method and application thereof
  • High-specific-surface-area super-hydrophilic gradient boron-doped diamond electrode and preparation method and application thereof
  • High-specific-surface-area super-hydrophilic gradient boron-doped diamond electrode and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Ti substrate BDD electrode material

[0068] The BDD electrode chooses titanium (Ti) as the substrate for depositing BDD, because the carbonized transition layer is easy to form on the surface of Ti, and the thermal expansion coefficients of Ti and C match, so it is easy to form a BDD film with good adhesion. Both have good corrosion resistance and stability at the same time. The preparation process is as follows

[0069] 1. Preparation of BDD materials

[0070] 1.1 Substrate material pretreatment

[0071] First cut the Ti into a sheet sample with a size of 30×20×2mm, and polish it with 600#, 800#, 1000# metallographic sandpaper; then immerse the polished Ti substrate in acetone (CH 3 COCH 3 ), absolute ethanol (C 2 h 5 OH) for 10 minutes of ultrasonic oscillation; then the Ti substrate was placed in the nano-diamond suspension and the seed crystal was ultrasonically planted for 30 minutes to enhance the nucleation. Finally, rinse with deionized ultrapure water a...

Embodiment 2

[0083] Preparation of nickel substrate BDD material

[0084] Nickel (Ni), as a common electrocatalytic material that is easily electrodeposited, can be processed into complex structures and shapes. Therefore, this example prepares BDD films on the surface of Ni substrate materials.

[0085] 1. Preparation of BDD materials

[0086] 1.1 Substrate material pretreatment

[0087] First cut Ni into sheet samples with a size of 25×30×2mm, then immerse the Ni substrate in acetone (CH3COCH3) and absolute ethanol (C2H5OH) for 10 minutes of ultrasonic oscillation, then rinse with deionized ultrapure water and dry stand-by.

[0088] 1.2 Preparation of transition layer

[0089] Metal Ni can easily catalyze diamond into other amorphous carbons, so it is impossible to directly deposit boron-doped diamond films; at the same time, the thermal expansion coefficient difference between Ni and C is large, and an effective carbonized transition layer cannot be formed, and the bonding between the...

Embodiment 3

[0102] Silicon substrate BDD electrode material

[0103] Silicon (Si) is the most common BDD substrate material because of its good corrosion resistance and low thermal expansion coefficient. Therefore, it has a high degree of lattice matching with the BDD film and a good binding force. In this example, a flat p-type doped silicon is used as the substrate material for experiments.

[0104] 1. Preparation of BDD materials

[0105] 1.1 Substrate material pretreatment

[0106] First cut the Si into a sheet sample with a size of 20×30×0.5 mm, then immerse the Si substrate in acetone (CH3COCH3) and absolute ethanol (C2H5OH) for 10 min and ultrasonically vibrate, then rinse with deionized ultrapure water and bake. Dry and set aside.

[0107] 1.2BDD film deposition

[0108] The hot wire used in this paper is The straight tungsten wire is used to completely cover the straight wire directly above the substrate, and then the pretreated substrate is put into the cavity of the HFCV...

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Abstract

The invention discloses a high-specific-surface-area super-hydrophilic gradient boron-doped diamond electrode and a preparation method and application thereof. According to the gradient boron-doped diamond electrode, a substrate is directly taken as an electrode base; or the surface of the substrate is provided with a transition layer, and then the substrate is taken as the electrode base, a gradient boron-doped diamond layer is arranged on the surface of the electrode base, and the wetting angle theta of the gradient boron-doped diamond electrode is smaller than 40 degrees; and the gradient boron-doped diamond layer sequentially comprises a gradient boron-doped diamond bottom layer, a gradient boron-doped diamond middle layer and a gradient boron-doped diamond top layer with the boron contents increased in a gradient mode from bottom to top. Therefore, the gradient boron-doped diamond layer has high attraction force, high corrosion resistance and high catalytic activity at the same time, high-boron content of the top layer is combined with one-time high-temperature treatment, so that the gradient boron-doped diamond electrode has the high specific surface area and superhydrophilicity, and the mineralization degradation efficiency of the gradient boron-doped diamond electrode can be greatly improved.

Description

technical field [0001] The invention relates to a superhydrophilic gradient boron-doped diamond electrode with a high specific surface area and a preparation method and application thereof, belonging to the field of electrode preparation. Background technique [0002] Boron-doped diamond (BDD) material has the advantages of wide potential window, good chemical stability and weak surface adsorption, compared with other electrochemical oxidation electrodes (such as PbO 2 , shape stable electrode (DSA), IrO 2 etc.) have a higher mineralization effect on organic pollutants in water. The degradation efficiency of the existing traditional flat plate structure BDD electrode materials is controlled by the diffusion rate in the system and the internal sp of the material. 3 / sp 2 (sp 3 phase carbon and sp 2 phase carbon ratio). Therefore, the method of seeking to improve the mineralization efficiency of organic matter by BDD electrode materials lies in the following three points...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C16/02C23C16/27C23C16/56C23C16/455C02F1/461C02F1/72C02F101/30
CPCC23C16/02C23C16/0227C23C16/278C23C16/277C23C16/271C23C16/56C23C16/455C23C16/0281C02F1/4674C02F1/4672C02F1/46109C02F2101/30C02F2001/46142C02F2001/46147C23C16/0272C02F2305/023C02F2303/04
Inventor 魏秋平马莉周科朝王立峰王宝峰施海平
Owner NANJING DAIMONTE TECH CO LTD
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