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A method for preparing carbon nanotube-modified palladium-loaded electrodes by electrophoresis-chemical deposition

A carbon nanotube, chemical deposition technology, applied in electrochemical water/sewage treatment, electrophoretic plating, electrolytic coatings, etc., can solve problems such as difficult to achieve results, improve efficiency, enhance stability and activity, and improve specific surface area. Effect

Active Publication Date: 2016-08-24
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Compared with the electroplating process, the dispersion force of the electroless plating solution is close to 100%, the coating is uniform, and there is no obvious edge effect. However, the electroplating method is difficult to achieve the above effects due to the limitation of the uneven distribution of the electric force lines.

Method used

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  • A method for preparing carbon nanotube-modified palladium-loaded electrodes by electrophoresis-chemical deposition
  • A method for preparing carbon nanotube-modified palladium-loaded electrodes by electrophoresis-chemical deposition
  • A method for preparing carbon nanotube-modified palladium-loaded electrodes by electrophoresis-chemical deposition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Put CNTs in mixed acid Ultrasonic at medium temperature for 4 hours, reflux at 60°C for 2 hours, filter and wash until neutral, dry and set aside;

[0029] (2) Dip the titanium (Ti) mesh in 40% NaOH solution at 80°C for 2 hours to remove surface oil stains, wash it with distilled water until neutral, then immerse it in 15% oxalic acid solution to remove surface oxides, at 98°C Keep it for 2 hours, rinse it with distilled water, and dry it with nitrogen for later use;

[0030] (3) prepare the Py solution of 0.04mmol / L, wherein the concentration of SLS is 1mmol / L, H 2 SO 4 The concentration is 0.05mol / L. The Ti mesh processed in step (2) is used as the anode, the Pt sheet is used as the cathode, the Py solution is used as the plating solution, the current is adjusted to 3mA, and the time is 5min, and the electrochemical method deposits a PPy film on the surface of the Ti mesh to obtain a PPy / Ti electrode;

[0031] (4) Prepare a 0.5 mg / mL CNTs dispersion with the ...

Embodiment 2

[0036] (1) Put CNTs in mixed acid Ultrasonic at medium temperature for 4 hours, reflux at 60°C for 2 hours, filter and wash until neutral, dry and set aside;

[0037](2) Dip the titanium (Ti) mesh in 40% NaOH solution at 80°C for 2 hours to remove surface oil stains, wash it with distilled water until neutral, then immerse it in 15% oxalic acid solution to remove surface oxides, at 98°C Keep it for 2 hours, rinse it with distilled water, and dry it with nitrogen for later use;

[0038] (3) prepare the Py solution of 0.04mmol / L, wherein the concentration of SLS is 1mmol / L, H 2 SO 4 The concentration is 0.05mol / L. The Ti mesh processed in step (2) is used as the anode, the Pt sheet is used as the cathode, the Py solution is used as the plating solution, the current is adjusted to 3mA, and the time is 5min, and the electrochemical method deposits a PPy film on the surface of the Ti mesh to obtain a PPy / Ti electrode;

[0039] (4) Prepare a 0.5 mg / mL CNTs dispersion with the C...

Embodiment 3

[0044] (1) Put CNTs in mixed acid Ultrasonic at medium temperature for 4 hours, reflux at 60°C for 2 hours, filter and wash until neutral, dry and set aside;

[0045] (2) Dip the titanium (Ti) mesh in 40% NaOH solution at 80°C for 2 hours to remove surface oil stains, wash it with distilled water until neutral, then immerse it in 15% oxalic acid solution to remove surface oxides, at 98°C Keep it for 2 hours, rinse it with distilled water, and dry it with nitrogen for later use;

[0046] (3) prepare the Py solution of 0.04mmol / L, wherein the concentration of SLS is 1mmol / L, H 2 SO 4 The concentration is 0.05mol / L. The Ti mesh processed in step (2) is used as the anode, the Pt sheet is used as the cathode, the Py solution is used as the plating solution, the current is adjusted to 3mA, and the time is 5min, and the electrochemical method deposits a PPy film on the surface of the Ti mesh to obtain a PPy / Ti electrode;

[0047] (4) Prepare a 0.5 mg / mL CNTs dispersion with the ...

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Abstract

The invention discloses a method for preparing a carbon nano-tube modified palladium-loaded electrode through electrophoresis-chemical deposition, belonging to the technical field of electrochemical water treatment. Polypyrrole is used as a cocatalyst, and a carbon nano tube is used as a catalyst carrier, so that the dispersibility of a catalyst is improved, and utilization ratio of the catalyst is increased; a chemical plating process is used as a catalyst deposition technology, so that the binding force between the catalyst and a substrate is enhanced; and crystal grains on a plating layer are fine and dense, so that the stability of the electrode is enhanced. According to the invention, a titanium mesh is used as the substrate, the oxidized carbon nano tube is modified on the surface of the substrate by using an electrophoresis method after a layer of polypyrrole film is polymerized on the surface of the substrate, and then, a layer of uniform carbon nano-tube carrier film is formed. Compared with a Pd / Ti electrode prepared under the same condition, a Pd / CNTs / PPy / Ti electrode prepared by depositing a palladium catalyst by using the chemical plating process is higher in catalytic performance.

Description

technical field [0001] The invention belongs to the technical field of electrochemical water treatment, uses titanium mesh as a substrate, electrophoresis deposits modified carbon nanotubes, electroless plating deposits palladium catalysts, prepares Pd / CNTs / PPy / Ti composite electrodes, and can be used for water-phase electrocatalysis of chlorinated organics Reductive dechlorination. Background technique [0002] Chlorinated organic compounds belong to the category of typical persistent organic pollutants, which are highly toxic and difficult to degrade. Electrocatalytic hydrodechlorination technology is an economical and effective green technology for degrading chlorinated organic compounds, with mild experimental conditions, low operating costs and few toxic by-products. As a catalyst, palladium (Pd) greatly improves the degradation rate of chlorinated organic compounds, but as a noble metal, the cost is high, so it is a meaningful research to improve the utilization rate ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D13/08C25D13/02C23C18/44C23F17/00C02F1/46C02F1/70
Inventor 孙治荣杜冉
Owner BEIJING UNIV OF TECH
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