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Application of modified PbO2 electrode in Ni-EDTA wastewater treatment

A wastewater treatment and electrode technology, applied in water/sewage treatment, oxidized water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of easy peeling off of coatings, low strength, easy to become brittle, etc. Achieve the effect of avoiding coating peeling, improving electrode strength and alleviating internal stress

Pending Publication Date: 2022-03-11
DONGGUAN UNIV OF TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] But PbO 2 There are still some problems in the actual engineering application of the anode, such as low strength, easy to become brittle and difficult to process, easy to peel off the coating and high toxicity after peeling off, etc. Therefore, it is necessary to treat PbO 2 Anodes are modified to make them more suitable for engineering applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Ceramic / PTFE-β-PbO 2 The preparation method of electrode material, comprises the following steps:

[0039] (1) Soak a 10cm×10cm ceramic substrate in concentrated sulfuric acid and industrial hydrogen peroxide (volume ratio 3:1) to remove impurities on the surface of the substrate, rinse with ultrapure water until neutral and dry for later use;

[0040] (2) Place the ceramic substrate processed in step (1) in 500mL electroless plating solution to carry out electroless plating of PbO 2 , configuration solution A250mL: ammonium acetate (NH 4OAC) 94g / L, lead nitrate (Pb(NO 3 ) 2 )16.55g / L; configuration solution B 250 mL: ammonium persulfate ((NH 4 ) 2 S 2 o 8 ) 22.8g / L. Take equal volumes of A and B and heat liquid A to 52±2°C, heat liquid B to 29±2°C, mix equal volumes of solutions A and B under air stirring, and adjust the pH of the mixed solution to 8.5 with ammonia water -9.5, immerse the ceramic substrate treated in step (1) in the air-stirred mixed solution ...

Embodiment 2

[0046] Ceramic / PTFE-β-PbO 2 The preparation method of electrode material, comprises the following steps:

[0047] (1) Soak a 10cm×10cm ceramic substrate in concentrated sulfuric acid and industrial hydrogen peroxide (volume ratio 3:1) to remove impurities on the surface of the substrate, rinse with ultrapure water until neutral and dry for later use;

[0048] (2) Place the ceramic substrate processed in step (1) in 500mL electroless plating solution to carry out electroless plating of PbO 2 , configuration solution A250mL: ammonium acetate (NH 4 OAC) 90g / L, lead nitrate (Pb(NO 3 ) 2 ) 15g / L; configuration solution B 250mL: ammonium persulfate ((NH 4 ) 2 S 2 o 8 ) 20g / L. Take equal volumes of A and B, heat liquid A to 52±2°C, heat liquid B to 29±2°C, mix equal volumes of solutions A and B under air stirring, and adjust the pH of the mixed solution to 8.5 with ammonia water -9.5, immerse the ceramic substrate treated in step (1) in the air-stirred mixed solution for 1 h...

Embodiment 3

[0054] Ceramic / PTFE-β-PbO 2 The preparation method of electrode material, comprises the following steps:

[0055] (1) Soak a 10cm×10cm ceramic substrate in concentrated sulfuric acid and industrial hydrogen peroxide (volume ratio 3:1) to remove impurities on the surface of the substrate, rinse with ultrapure water until neutral and dry for later use;

[0056] (2) Place the ceramic substrate processed in step (1) in 500mL electroless plating solution to carry out electroless plating of PbO 2 , configure solution A 250mL: ammonium acetate (NH 4 OAC) 95g / L, lead nitrate (Pb(NO 3 ) 2 ) 17g / L; configuration solution B 250mL: ammonium persulfate ((NH 4 ) 2 S 2 o 8 ) 24g / L. Take equal volumes of A and B, heat liquid A to 52±2°C, heat liquid B to 29±2°C, mix equal volumes of solutions A and B under air stirring, and adjust the pH of the mixed solution to 8.5 with ammonia water -9.5, immerse the ceramic substrate treated in step (1) into the mixed solution stirred by air for 0...

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Abstract

The invention discloses an application of a modified PbO2 electrode in Ni-EDTA wastewater treatment. Compared with the prior art, the modified PbO2 electrode has the advantages that the electrode strength is obviously improved by improving the electrode, a coating is prevented from being peeled off, and the application of a PbO2 anode in degrading metal complex wastewater is promoted; meanwhile, in the PbO2 electro-deposition process of the electrode, polytetrafluoroethylene (PTFE) is doped, the service life of the electrode can be prolonged, and the electro-catalytic activity of the electrode can be improved. When the ceramic PTFE-beta-PbO2 electrode is used as an anode, the degradation rate of Ni-EDTA can be increased to 94% or above, the nickel recovery rate of the cathode reaches 28% or above, and effective treatment of Ni-EDTA wastewater is achieved.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment and relates to modified PbO 2 Electrode application in Ni-EDTA wastewater treatment; specifically related to ceramic PTFE-β-PbO 2 Application of electrodes in Ni-EDTA wastewater treatment. Background technique [0002] Ethylenediaminetetraacetic acid (EDTA) is an organic complexing agent commonly used in electroplating and circuit board industries. It is easy to form a stable Ni-EDTA complex with nickel. This complex is highly toxic and has poor biodegradability. Stable existence. At present, the chemical precipitation method commonly used in industry is difficult to completely remove it, making it difficult to meet the standard of nickel ions. Therefore, it is urgent to develop an economical and practical Ni-EDTA sewage treatment technology. [0003] Electrocatalytic oxidation is a process in which hydroxyl radicals generated at the anode are used as the main oxidant to gradually ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/72C04B41/87C25C1/08C25C7/02C25D5/54C25D9/02C25D9/06C02F101/34C02F101/38
CPCC02F1/46109C02F1/4672C25D5/54C25D9/06C25D9/02C25C1/08C25C7/02C04B41/5027C04B41/009C04B41/87C02F2101/34C02F2101/38C02F2001/46133C04B41/4535C04B35/00
Inventor 卓琼芳徐小凤谢水波刘静静李衍亮邱永福王振兴郑文丽
Owner DONGGUAN UNIV OF TECH
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