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Cerium-doped lead dioxide electrode, and preparation method and application thereof in quick decolorization and efficient mineralization of basic dyes

A lead dioxide and cerium doping technology, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of slow treatment process, many intermediate products, long process flow, etc. Achieve the effects of rapid decolorization, increased service life and strong catalytic activity

Inactive Publication Date: 2013-01-30
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods generally have a long process flow, slow processing, and many intermediate products, which are easy to cause secondary pollution, and the cost is relatively expensive.

Method used

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  • Cerium-doped lead dioxide electrode, and preparation method and application thereof in quick decolorization and efficient mineralization of basic dyes
  • Cerium-doped lead dioxide electrode, and preparation method and application thereof in quick decolorization and efficient mineralization of basic dyes
  • Cerium-doped lead dioxide electrode, and preparation method and application thereof in quick decolorization and efficient mineralization of basic dyes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Grind the titanium plate with coarse and fine sandpaper to make the surface of the titanium plate show a uniform light gray luster.

[0034] 2) Immerse the polished titanium plate in a 40 wt% NaOH solution, and wash it in alkali at 80 ℃ for 2 hours to remove grease and other contaminants on the surface of the titanium plate.

[0035] 3) The alkali-washed titanium plate is immersed in 15 wt% oxalic acid solution and pickled at 90 ℃ for 2 hours to remove TiO 2 .

[0036] 4) The acid-washed titanium plate is used as the anode, the Pt electrode is the cathode, and the electrolyte is composed of 0.8 wt% NaF and 1.6 wt% Na 2 SO 4 , 10 wt% polyethylene glycol and ultrapure water, etched at a constant pressure of 20 V for 3 hours, and then calcined in a muffle furnace at 500 ℃ for 1.5 hours.

[0037] 5) Use Pt electrode as anode and calcined titanium plate as cathode, 1 mol / L (NH 4 ) 2 SO 4 It is an electrolyte, which is energized at a constant voltage of 1.5 V for 20 seconds.

[0038...

Embodiment 2

[0043] 1) Grind the titanium plate with coarse and fine sandpaper to make the surface of the titanium plate show a uniform light gray luster.

[0044] 2) Immerse the polished titanium plate in a 30 wt% NaOH solution, and wash it with alkali at 90 ℃ for 3 hours to remove grease and other contaminants on the surface of the titanium plate.

[0045] 3) The alkali-washed titanium plate is immersed in a 10 wt% oxalic acid solution and pickled at 95 ℃ for 4 hours to remove TiO on the surface of the titanium plate 2 .

[0046] 4) The pickled titanium plate is used as the anode, the Pt electrode is the cathode, and the electrolyte is composed of 0.5 wt% NaF and 1 wt% Na 2 SO 4 , 5 wt% polyethylene glycol and ultrapure water, etched at a constant pressure of 15V for 3 hours, and then calcined in a muffle furnace at 500 ℃ for 3 hours.

[0047] 5) Use Pt electrode as anode and calcined titanium plate as cathode, 0.5 mol / L (NH 4 ) 2 SO 4 It is an electrolyte, which is energized at a constant voltag...

Embodiment 3

[0053] 1) Grind the titanium plate with coarse and fine sandpaper to make the surface of the titanium plate show a uniform light gray luster.

[0054] 2) Immerse the polished titanium plate in a 50 wt% NaOH solution, and wash it in alkaline at 70 ℃ for 1 hour to remove grease and other contaminants on the surface of the titanium plate.

[0055] 3) The alkali-washed titanium plate is immersed in 20 wt% oxalic acid solution and pickled at 80 ℃ for 3 hours to remove TiO on the surface of the titanium plate 2 .

[0056] 4) The acid-washed titanium plate is used as the anode, the Pt electrode is the cathode, and the electrolyte is composed of 2 wt% NaF and 5 wt% Na 2 SO 4 , 20 wt% polyethylene glycol and ultrapure water, etched at a constant pressure of 25V for 1 hour, and then calcined in a muffle furnace at 500 ℃ for 3 hours.

[0057] 5) Use the Pt electrode as the anode and the calcined titanium plate as the cathode, 1.5 mol / L (NH 4 ) 2 SO 4 It is an electrolyte, which is energized at a ...

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Abstract

The invention discloses a cerium-doped lead dioxide electrode, and a preparation method and application thereof in the quick decolorization and efficient mineralization of basic dyes. The preparation method of the electrode comprises the following steps: etching a titanium plate into a titanium dioxide nanotube array base; filling a small amount of elemental copper into the titanium dioxide nanotube through electrodeposition; then, preparing a cerium-containing lead dioxide electrodeposition solution; and finally, preparing the cerium-doped lead dioxide electrode on the titanium dioxide nanotube array base through electrodeposition. When being used for treating waste water containing basic dyes, the prepared electrode can realize the quick decolorization and efficient mineralization of the basic dyes in the waste water. According to the cerium-doped lead dioxide electrode obtained in the invention, the catalytic activity and service life are greatly improved in comparison with an undoped lead dioxide electrode, and the water treatment cost based on an electrochemical method can be effectively reduced; no other additional chemical substances are introduced in the treatment process of the waste water containing the dyes, thereby avoiding secondary pollution; and the preparation method has mild reaction conditions and is simple to operate.

Description

[0001] technical field [0002] The invention belongs to the field of organic wastewater treatment technology and electrochemistry, and in particular relates to a preparation method of a cerium-doped lead dioxide electrode and its application in decolorization and mineralization of alkaline dye wastewater. Background technique [0003] Dyes play an important role in people's daily life, and many industries such as textiles, papermaking, leather, food, etc. use dyes extensively. Due to the loss and residue in the process of production and use, a large amount of dye wastewater is produced. The complex structure of dyes leads to the obvious characteristics of dye wastewater with high chroma, high toxicity, high salinity and low BOD / COD, which brings great difficulties to the effective treatment of dye wastewater. [0004] Basic dyes, also known as basic dyes, most of their chromophoric groups are organic bases, which are characterized by bright color and strong tinting power, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461
Inventor 李琴张秋安浩崔皓丁亮钱言李保菊翟建平
Owner NANJING UNIV
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