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Method for preparing nanometer lead dioxide electrode

A technology of lead dioxide and titanium dioxide, which is applied in the field of water treatment technology and electrochemistry, can solve the problems of complex preparation process, weak oxidation performance, low oxygen evolution overpotential, etc., and achieve broadened research space, electrocatalytic activity and service life Improved effect

Inactive Publication Date: 2011-09-07
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using platinum electrodes, most of the current will be consumed in the process of oxygen generation, resulting in low current efficiency
Iridium dioxide and ruthenium dioxide electrodes have weak oxidation performance on organic matter
However, the preparation process of such electrodes is quite complex and costly, especially for large-area production
Graphite electrodes are cheap but their current efficiency is very low due to their low oxygen evolution overpotential
The tin dioxide electrode does not have this problem, its oxygen evolution overpotential is much higher, but it has another obvious defect: the service life is too short

Method used

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  • Method for preparing nanometer lead dioxide electrode
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  • Method for preparing nanometer lead dioxide electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Preparation of ordinary lead dioxide electrode by electrodeposition on titanium substrate:

[0061] Cut the titanium plate into 2cm×5cm titanium sheets, and polish it with No. 100, No. 400, and No. 800 sandpaper successively until it is bright and free of scratches. Ultrasonic cleaning with acetone and pure water for 15 minutes respectively, and then microboiling treatment in 10% oxalic acid for 1 hour. After thoroughly washing with distilled water, pulse electrodeposition was carried out in a three-electrode system using it as a working electrode, a lead plate as a cathode, and silver / silver chloride as a reference. The pulse of each cycle is divided into three sections, and the time length of each section and the voltage applied in the time section are respectively t 0 = 2s,E e = 0V; t i =0.2s,E 1 =5.0V; t 2 =0.05s,E 2 =-0.5V.

[0062] Preparation of nano-lead dioxide electrodes by electrodeposition on titania nanotube array substrates:

[0063] (1) Preparatio...

Embodiment 2

[0077] The method for preparing a common lead dioxide electrode by electrodeposition on a titanium substrate is the same as that of Example 1.

[0078] Preparation of nano-lead dioxide electrodes by electrodeposition on titania nanotube array substrates:

[0079] (1) Grind the cut titanium sheet (20mm×50mm×1mm) with No. 100, No. 400 and No. 800 sandpaper successively until the surface of the titanium sheet emits a uniform and obvious metallic luster, and the color of the unpolished area will follow that of the polished one. It is not the same, and strive to polish completely. Prepare a degreasing agent with 20g L-1 sodium hydroxide, 35g L-1 sodium carbonate and 5g L-1 sodium silicate, put the polished titanium sheet into the degreasing agent at 90°C for 10 minutes, and wash it with distilled water Then carry out pickling: put it into hydrochloric acid with a volume ratio of 1:1 to water and heat at 80°C for 10 minutes.

[0080] Use 80.3g of diethylene glycol and 2.8g of 40% ...

Embodiment 3

[0092] The preparation method of two kinds of electrodes is identical with embodiment example 2. The difference lies in the used fluorine-containing electrolyte and anodization conditions during the anodization process for preparing the nanometer lead dioxide electrode. The fluorine-containing electrolyte was changed to 0.27M ammonium fluoride solution prepared in glycerol-water solution with a volume ratio of 1:1. Correspondingly, the anodizing conditions were changed: a pretreated titanium sheet was used as an anode, a platinum sheet was used as a cathode, a direct current of 35V was applied, and anodized for 6 hours.

[0093] The wettability test is carried out on a contact angle meter, and the liquid dropped on the surface of the electrode to be tested is distilled water. By comparing the contact angles of water droplets on different electrode surfaces, we found that due to the large difference in the wettability of the two lead dioxide electrode substrates, the contact a...

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Abstract

The invention relates to a method for preparing a nanometer lead dioxide electrode, which comprises the following steps of: firstly, preparing a titanium dioxide nano tube array substrate; secondly, preparing lead dioxide electrodeposition solution; and finally, performing electrodeposition on the titanium dioxide nano tube array substrate to prepare the nanometer lead dioxide electrode. The method has the advantage that: compared with those of the ordinary titanium-base lead dioxide electrode obtained by direct-current deposition, the electro-catalytic activity of the nanometer lead dioxide electrode is improved greatly, and the service life of the nanometer lead dioxide electrode is prolonged greatly. By the method, a new concept is provided for the study of electrodes for water treatment, the study space is broadened, and the technology and the existing doping technology are combined to develop better electrodes; and by the method, the electro-catalytic activity of organic pollutants in oxidized waste water is high, a preparation process is simple, the cost is low, the cost for electrochemical water treatment can be reduced, and economic and social benefits are excellent.

Description

technical field [0001] The invention belongs to the field of water treatment technology and electrochemistry, and relates to a preparation method of a nanometer lead dioxide electrode and an application in organic wastewater treatment. Background technique [0002] The increasing amount of refractory organic wastewater poses challenges to traditional biological treatment because, unlike other compounds in wastewater, these components limit biodegradation or bioavailability. In order to meet increasingly stringent wastewater discharge standards, other treatment technologies must be sought. In recent years, many new technologies have emerged in the treatment of industrial wastewater containing organic pollutants. In the field of refractory wastewater treatment, electrochemical oxidation is considered to be a promising method and has aroused the research interest of many scholars. It has the advantages of good environmental compatibility, small footprint and super oxidation a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G21/08B82Y40/00
Inventor 谭超李义久相波徐晓凯
Owner TONGJI UNIV
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