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Electroplating liquid for preparing lead dioxide electrodes and application thereof

A technology of lead dioxide and electroplating solution, which is applied in the direction of electrodes, electrolytic processes, electrolytic components, etc., can solve the problems of innovative research on lead dioxide plating solution and limitation of coating performance, so as to make up for easy passivation and deactivation, and improve coating performance , good stability

Active Publication Date: 2010-08-11
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that there are many innovative researches on the preparation process of lead dioxide, but none of these studies have carried out innovative research on the lead dioxide plating solution. Most workers use traditional lead nitrate as the lead salt in the electroplating process, and nitric acid as the pH regulator. agent
The composition of this plating solution limits the optimization of the coating performance to a certain extent, and has certain limitations for prolonging the life of the electrode and improving the degradation efficiency of the electrode to organic matter.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Prepare the lead dioxide plating solution by dissolving the following compounds in deionized water:

[0021] Lead acetate 250g / L

[0022] Sulfamic acid 15g / L

[0023] Sodium fluoride 0.5g / L

[0024] PTFE (60wt%) 6ml / L

[0025] According to the electroplating step in the specific embodiment, the electroplating operation is performed using the lead dioxide electroplating solution. The temperature during electroplating is 60°C, and the plating current density is 30mA / cm 2 , Plating time 1h.

[0026] The surface of the plated electrode coating is smooth and flat, showing light blue cyan, with a slight silvery white metallic color; the oxygen evolution overpotential of the coating in 20g / L anhydrous sodium sulfate is 1.68V; the electrode is continuously electrolyzed in 9mol / L sulfuric acid solution for 24h, The weight loss of the electrode was 0.0491g; the electrolysis of 1mmol / L 4-chlorophenol for 1h, the removal rate of the target substance was 56%.

Embodiment 2

[0028] Prepare the lead dioxide plating solution by dissolving the following compounds in deionized water:

[0029] Lead acetate 260g / L

[0030] Sulfamic acid 18g / L

[0031] Sodium Fluoride 1.2g / L

[0032] PTFE (60wt%) 6ml / L

[0033] According to the electroplating step in the specific embodiment, the electroplating operation is performed using the lead dioxide electroplating solution. Plating temperature 70°C, plating current density 35mA / cm 2 , Plating time 1.5h.

[0034] The surface of the plated electrode coating is smooth and flat, blue and blue, with a slight silvery white metallic color; the oxygen evolution overpotential of the coating in 20g / L anhydrous sodium sulfate is 1.72V; the electrode is continuously electrolyzed in 9mol / L sulfuric acid solution for 24h, the electrode Weight loss of 0.0451g; electrolysis of 1mmol / L 4-chlorophenol for 1h, the removal rate of the target substance was 59%.

Embodiment 3

[0036] Prepare the lead dioxide plating solution by dissolving the following compounds in deionized water:

[0037] Lead acetate 270g / L

[0038]Sulfamic acid 18g / L

[0039] Sodium Fluoride 1.8g / L

[0040] PTFE (60wt%) 7ml / L

[0041] According to the electroplating step in the specific embodiment, the electroplating operation is performed using the lead dioxide electroplating solution. The temperature during electroplating is 70°C, and the plating current density is 40mA / cm 2 , Plating time 1.5h.

[0042] The surface of the plated electrode coating is smooth and flat, dark blue cyan, with a slight silvery white metallic color; the oxygen evolution overpotential of the coating in 20g / L anhydrous sodium sulfate is 1.76V; the electrode is continuously electrolyzed in 9mol / L sulfuric acid solution for 24h, the electrode Weight loss of 0.0294g; electrolysis of 1mmol / L 4-chlorophenol for 1h, the removal rate of the target substance was 72%.

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Abstract

The invention discloses electroplating liquid for preparing lead dioxide electrodes and application thereof. The electroplating liquid is prepared from the following ingredients by volume: lead acetate which is the main ingredient and is calculated by basing on 250-280g / L of Pb(CH3COO)2.3H2O by weight, 15-20g / L of sulfamic acid serving as acidity regulator, 0.5-3g / L of sodium fluoride electroplating liquid serving as additive, 6-8ml / L of polytetrafluoroethylene emulsion serving as electroplate liquid additive and the allowance of deionized water. The materials of the electroplating liquid are easy to obtain, and the electroplating liquid has little acid corrosion and is simple to electroplate. When the electroplating liquid is used for preparing a lead dioxide electrode, the coating is smooth and compact and has good binding force, good intrinsic stability, long service life and good catalytic activity and is high in organic matter degradation efficiency.

Description

(1) Technical field [0001] The invention belongs to the field of electrochemical electroplating, and in particular relates to an electroplating solution for preparing lead dioxide electrodes and an application thereof. (2) Background technology [0002] The anode materials used in the industry used lead electrodes as electrolytic anodes for a long time before the appearance of coated electrodes. Due to the disadvantages of high energy consumption, low strength, and impure anode products, various lead alloys were developed later. Electrodes, and have been applied in industry. However, due to the common shortcomings of such electrodes, such as high electrode price and low oxygen evolution overpotential, they cannot be widely used in industry. [0003] As a good anode material, the coated lead dioxide electrode has been widely used in the electrolysis industry of hypochlorous acid, chlorate, chromic acid and other inorganic salts due to its low cost, good corrosion resistance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/16
Inventor 童少平张蓉魏状王勋华马淳安
Owner ZHEJIANG UNIV OF TECH
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