Preparation method of titanium-based composite anode for heavy metal wastewater treatment

A composite anode and wastewater treatment technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of expensive precious metals, high electrode preparation costs, weakened coating adhesion, etc., to achieve long service life, excellent performance, and reduce The effect of power consumption

Inactive Publication Date: 2019-03-01
LANZHOU JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are still some problems in the application of traditional titanium-based iridium-based binary coating anodes, such as: expensive precious metals, resulting in high electrode preparation costs; matrix titanium is easy to oxidize, which makes the coating adhesion weaken and fall off, resulting in electrode inactivation

Method used

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  • Preparation method of titanium-based composite anode for heavy metal wastewater treatment

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0030] First, cut the titanium plate with a thickness of 1mm into 5cm*5cm, and then polish it with 200-grit sandpaper until it presents a silvery white metallic luster. Mix 20% sodium hydroxide solution and acetone solution at a volume ratio of 1:1, ultrasonically disperse for 10 minutes, place the polished titanium substrate in it, degrease at 60°C for 1 hour, and then put The titanium plate was placed in a 10% oxalic acid solution, etched at 90°C for 2 hours, ultrasonically cleaned with deionized water for 10 minutes, and dried in an oven for use.

[0031] Add 5mL tetraethyl orthosilicate to 100mL absolute ethanol and KNO mixed at a volume ratio of 1:1 3 In the mixed solution, add HCl solution with a mass fraction of 10% to adjust the pH of the solution to 3, and hydrolyze it for 5 hours at 25°C to obtain SiO 2 precursor solution.

[0032] The Ti plate was used as the working electrode, the Ag / AgCl electrode was used as the reference electrode, and the graphite electrode w...

Embodiment approach 2

[0038] First, cut the titanium plate with a thickness of 1mm into 5cm*5cm, and then polish it with 200-grit sandpaper until it presents a silvery white metallic luster. Mix 20% sodium hydroxide solution and acetone solution at a volume ratio of 1:1, and disperse them evenly by ultrasonication for 10 minutes. Place the polished titanium substrate in it, degrease at 60°C for 1 hour, and then put The titanium plate was placed in a 10% oxalic acid solution, etched at 90°C for 2 hours, ultrasonically cleaned with deionized water for 10 minutes, and dried in an oven for use.

[0039] Add 5mL tetraethyl orthosilicate to 100mL absolute ethanol and KNO mixed at a volume ratio of 1:1 3 In the mixed solution, add HCl solution with a mass fraction of 10% to adjust the pH of the solution to 3, and hydrolyze it for 5 hours at 25°C to obtain SiO 2 precursor solution.

[0040] The Ti plate was used as the working electrode, the Ag / AgCl electrode was used as the reference electrode, and the ...

Embodiment approach 3

[0046] First, cut the titanium plate with a thickness of 1mm into 5cm*5cm, and then polish it with 200-grit sandpaper until it presents a silvery white metallic luster. Mix 20% sodium hydroxide solution and acetone solution at a volume ratio of 1:1, ultrasonically disperse for 10 minutes, place the polished titanium substrate in it, degrease at 60°C for 1 hour, and then put The titanium plate was placed in a 10% oxalic acid solution, etched at 90°C for 2 hours, ultrasonically cleaned with deionized water for 10 minutes, and dried in an oven for use.

[0047] Add 5mL tetraethyl orthosilicate to 100mL absolute ethanol and KNO mixed at a volume ratio of 1:1 3 In the mixed solution, add HCl solution with a mass fraction of 10% to adjust the pH of the solution to 3, and hydrolyze it for 5 hours at 25°C to obtain SiO 2 precursor solution.

[0048] The Ti plate was used as the working electrode, the Ag / AgCl electrode was used as the reference electrode, and the graphite electrode w...

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Abstract

The invention discloses a preparation method of a titanium-based composite anode and belongs to the field of heavy metal wastewater treatment. The prepared anode consists of a titanium matrix, a silicon dioxide middle layer and an iridium cerium niobium ternary active oxide coating. Compared with a conventional IrO2 anode, the addition of the SiO2 middle layer increases the active surface area ofanodic oxygen evolution reaction. The addition of Nb2O5 refines the surface grains of the oxide coating, makes the coating more compact and improves the stability of the anode. CeO2 plays the effect of a pore-forming agent. The addition of CeO2 makes the oxide dispersed in the coating more uniformly and improves the anodic electrocatalytic activity. The anode prepared has good oxygen evolution performance and long service life and is a good choice of an anode material for heavy metal wastewater treatment.

Description

technical field [0001] The invention relates to the field of heavy metal wastewater treatment, in particular to a method for preparing a titanium-based composite anode. Background technique [0002] In recent years, the rapid economic growth has promoted the vigorous development of medicine, pesticides, chemical production and other fields, and a large amount of heavy metal wastewater is produced. If the heavy metal wastewater is not treated up to the standard, it will be discharged into the water body and soil, which will seriously pollute the environment and endanger human beings. healthy. Electrocatalytic oxidation treatment of heavy metal wastewater has the advantages of complete efficiency and no secondary pollution, which has prompted more scholars to devote themselves to the research of electrocatalytic oxidation technology for heavy metal wastewater treatment. The electrode is the core factor affecting the effect of electrocatalytic oxidation. [0003] Dimensionally...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/10C25B11/08C23G1/20C25B1/04
CPCC23G1/205C25B1/04C25B11/057C25B11/077C25B11/093Y02E60/36
Inventor 赵小云周键赵志龙邹信王三反张学敏
Owner LANZHOU JIAOTONG UNIV
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