Indium-doped titanium-based lead dioxide electrode as well as preparation method and application thereof

A lead dioxide and electrode technology, which is applied to chemical instruments and methods, electrolytic inorganic material coatings, water pollutants, etc., can solve the problems of complex preparation process of boron-doped diamond electrodes, expensive platinum electrodes, and low current efficiency. Achieve high electrochemical stability, reduce crystal particle size, and improve catalytic activity

Inactive Publication Date: 2017-01-04
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Platinum electrodes are expensive, and the oxygen evolution potential is low. Most of the current consumption is in the process of generating oxygen, resulting in low current efficiency; graphite electrodes are cheap, but also have low oxygen evolution potential; The performance is weak; the tin dioxide electrode has an obvious defect: the electrode life is too short; the preparation process of the boron-doped diamond electrode is complicated and the cost is high, especially for large-scale production
[0006] Studies on lead dioxide electrodes have shown that although these improved lead dioxide electrodes have strong stability and electrocatalysis, the catalytic activity and current efficiency of the electrodes still need to be further improved.

Method used

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  • Indium-doped titanium-based lead dioxide electrode as well as preparation method and application thereof
  • Indium-doped titanium-based lead dioxide electrode as well as preparation method and application thereof
  • Indium-doped titanium-based lead dioxide electrode as well as preparation method and application thereof

Examples

Experimental program
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Embodiment 1

[0053] Preparation of In-doped titanium-based lead dioxide electrode:

[0054] (1) Titanium substrate pretreatment: the thickness is 0.1mm, the size is 14cm 2 (7cm×2cm) pure titanium sheet was polished with 120-mesh, 600-mesh and 1200-mesh sandpaper in turn until the titanium substrate showed a silvery-white metallic luster, and was rinsed with deionized water; the polished and cleaned titanium sheet was placed in a mass fraction of 40 % NaOH solution for 30min, rinsed with deionized water; then at 60°C, in H 2 SO 4 Soak in solution (mass fraction: 20%) for 20min, take it out and wash it with deionized water; finally soak and etch in oxalic acid solution (mass fraction: 15%) for 3h at 80°C, rinse with a large amount of distilled water to remove the titanium matrix The remaining oxalic acid and titanium oxalate on the surface can obtain a pretreated titanium matrix. The pretreated titanium matrix is ​​gray and pitted, and it is stored in oxalic acid with a mass fraction of 1...

Embodiment 2

[0067] The In-doped lead dioxide electrode prepared in Example 1 and the lead dioxide electrode not doped with In prepared in Comparative Example 1 were used to electrocatalytically oxidize and degrade aspirin.

[0068] The In-doped lead dioxide electrode prepared in Example 1 or the lead dioxide electrode not doped with In prepared in Comparative Example 1 is the anode, and the titanium sheet is the cathode, and the electrode area is 14 cm 2 , electrochemical degradation using constant current electrolysis. Constant current density of 50mA cm -2 , The electrode spacing is 4cm. To contain 0.1mol L -1 Electrolyte Na 2 SO 4 500mg L -1 Aspirin is a simulated wastewater with a reaction volume of 250mL. Under the action of magnetic stirring, the wastewater is treated, and samples are taken for analysis at different times during the degradation reaction. The changes of the concentration of aspirin at different times are measured by high performance liquid chromatography (HPLC)...

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Abstract

The invention provides an indium-doped titanium-based lead dioxide electrode as well as a preparation method thereof and application to degradation treatment of high-concentration pharmaceutical wastewater which is difficult to biologically degrade. The electrode takes titanium as a base body; a tin-antimony oxide bottom layer, an alpha-PbO2 middle layer and an In-doped fluorine-containing beta-PbO2 active layer are plated on the titanium base body from inside to outside in sequence; the lead dioxide electrode is modified through an electrode structural design and surface doping, and PbO2 micro-particles on the surface of the electrode can be more tightly and uniformly dispersed through adding main group metal In and a high polymer fluorine resin, so that the structure and properties of the surface of the electrode are greatly improved; inner stress between the PbO2 active layer and the titanium base body is reduced, so that the prepared electrode has higher oxygen evolution potential and electrochemical stability and the service life of the electrode is effectively prolonged; the electrode has a good catalytic performance, a long service life and high practicability, is easy to prepare and has a wide market prospect.

Description

[0001] (1) Technical field [0002] The invention relates to a main group metal indium (In) doped titanium-based lead dioxide electrode and its preparation method and application. The electrode has high catalytic performance and can be applied to the electrochemical degradation of refractory biodegradable pharmaceutical wastewater, which belongs to electrochemical Technical and environmental wastewater treatment technology field. [0003] (2) Background technology [0004] With the rapid development of society, the number and types of refractory organic compounds in industrial wastewater are increasing day by day. These toxic and harmful high-concentration refractory organic wastewater pose great challenges to traditional biological treatment methods. The typical one is pharmaceutical wastewater, which has complex components and is difficult to degrade. It is a difficult point and a hot spot in water treatment at home and abroad. Therefore, in order to meet increasingly string...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C25D9/04C02F101/30
CPCC02F1/46109C02F2001/46133C02F2101/30C25D9/04C02F1/461
Inventor 陈建孟戴启洲夏伊静
Owner ZHEJIANG UNIV OF TECH
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