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Preparation method of SnO2 electrode and use thereof

An electrode and titanium matrix technology, applied in the field of electrochemistry, can solve problems such as cracks, low loading capacity, low activity and service life, and achieve the effects of reducing cracks, increasing service life, improving mechanical strength and loading capacity

Inactive Publication Date: 2019-08-06
CHINESE ACAD OF ENVIRONMENTAL PLANNING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a SnO 2 The preparation method of the electrode, which effectively solves the traditional SnO 2 Problems of low loading of effective components, severe cracking, low activity and service life of electrode active coating

Method used

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  • Preparation method of SnO2 electrode and use thereof
  • Preparation method of SnO2 electrode and use thereof
  • Preparation method of SnO2 electrode and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A kind of SnO 2 The preparation method of electrode specifically comprises the following steps:

[0036] a. Titanium substrate pretreatment: immerse the titanium substrate in sodium hydroxide with a mass fraction of 5% at 100°C for 1 hour, clean it, and then use 0.2Mpa compressed air to spray 600-mesh zirconia sand on the surface of the titanium substrate and store it in The mass fraction is 0.1% oxalic acid solution for standby; the titanium substrate is used as the anode and placed in the ethylene glycol solution for high-voltage electrostatic treatment, the cathode is made of stainless steel and other materials, the distance is 5cm, the voltage is 50V, the electrolyte is 0.05mol / L ammonium sulfate, and the treatment time 40s.

[0037] b. Preparation of ethylene glycol citrate coating liquid: heat ethylene glycol to 60°C, add citric acid (the molar ratio of ethylene glycol to citric acid is 4.3:1), and stir for 1 h to prepare the coating base liquid. Continue heatin...

Embodiment 2

[0041] Prepare a solution containing 10mM / L sodium sulfate and 100mg / L nitrobenzene. Get the solution of 100mL and inject in the electrolyzer, with the SnO prepared in embodiment 1 2 The electrode is the anode, the titanium plate is the cathode, and the area of ​​both electrodes is 25cm 2 , adjust the distance between the plates to 10mm, turn on the power and adjust the current to maintain the output current density at 10mA / cm 2 , electrolytic treatment at room temperature for 90 minutes, and sampling and analysis at intervals of 5 minutes. After 60 minutes of treatment, the removal rate of nitrobenzene was greater than 92.0%, while the removal rate of total organic carbon (TOC) was greater than 82%, and the total nitrogen (TN) decreased by 60%.

Embodiment 3

[0043] Prepare a solution containing 1M sulfuric acid. The existing electrode A with a size of 1*1 cm and the electrode B of the present invention were selected as working electrodes to carry out the enhanced life test in the configured sulfuric acid solution. The current density is 1A / cm 2 , the distance between the working electrode and the counter electrode was 1 cm. Observe the change of the cell voltage of the working electrode in the continuous working state. Experimental results such as figure 1 shown.

[0044] The existing electrode A can maintain a cell voltage of about 3V and work stably for about 150 hours, and then the cell voltage gradually increases, indicating that the electrode surface active layer begins to fall off; the working time reaches 175 hours, and the cell voltage exceeds 3.5V, indicating that the electrode surface active layer has a large area Falling off, the electrode is deactivated.

[0045] Electrode B of the present invention can maintain a...

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Abstract

The invention discloses a preparation method of a SnO2 electrode and use thereof. After a titanium substrate is sandblasted, the titanium substrate is subjected to high-voltage electrostatic treatment, and then placed in a reaction chamber, a sol-gel coating liquid containing SnCl4, SbCl3 and CeCl3 is introduced into the reaction chamber for chemical reaction on the surface of the titanium substrate to form metal oxides, and the metal oxides are deposited on the surface of the titanium substrate to form a root tube stabilization layer of about 5 mu m and a 15 mum active layer. The preparationmethod adopts a high-voltage electrostatic-pyrolysis process to deposit active metals on the surface of the titanium substrate, so the the active technology penetrates into the titanium substrate, thephysical stability of the active layer is increased, the preparation cycle of a SnO2 electrode coating is significantly shortened, and the life of the electrode is extended.

Description

technical field [0001] The invention belongs to the field of electrochemical technology, in particular to a SnO 2 Electrode preparation method and its use. Background technique [0002] Electrochemical oxidation technology is considered as a direct and efficient wastewater purification treatment technology, which has attracted widespread attention. At present, electrochemical oxidation technology requires active metals as catalysts for electrochemical oxidation reactions, and the catalysts commonly used at this stage are SnO 2 , PbO 2 Wait. [0003] Traditional SnO 2 Electrode preparation by mixing ethylene glycol citrate with SnCl 4 The sol-gel is prepared, and the finished electrode is prepared by repeated coating-baking. This preparation method has the following disadvantages: 1. The active coating prepared by coating-calcination cannot be permanently attached to the titanium substrate. 1. The sol-gel crystal concentration is low, and the amount of active coating ob...

Claims

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Application Information

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IPC IPC(8): C02F1/461C02F1/72
CPCC02F1/46109C02F1/4672C02F2001/46142
Inventor 徐泽升曹国志於方朱文英王鲲鹏周夏飞
Owner CHINESE ACAD OF ENVIRONMENTAL PLANNING
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