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Working electrode, electro-adsorption system and method for adsorbing metal ions in wastewater

A working electrode, metal ion technology, applied in separation methods, chemical instruments and methods, water pollutants, etc., can solve the problems of low adsorption, poor electrode adsorption effect, etc., to achieve a short operation process, simple operation, technical parameters can be control effect

Active Publication Date: 2021-09-24
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, it has not been seen to use a square wave periodic electric field in the treatment of strong acid wastewater with a pH value less than or equal to 3, such as acid nuclear industrial wastewater, uranium ore leachate, iron and steel industry acid wastewater, and rare earth smelting wastewater, especially the use of different square waves. Research Report on Electrosorption and Recycling of Various Metal Ions Separately by Periodic Electric Field
The electrodes used in the existing electro-adsorption uranium-containing water technology have poor adsorption effect under strong acidic conditions with a pH value less than or equal to 3, and the selective adsorption is very low when there are various metal ions in the wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] A working electrode for adsorbing metal ions in waste water, the preparation method steps of the working electrode are as follows:

[0059] (1) The thickness of 0.5g dried is 0.20mm, and the resistivity is 0.90mΩ·cm 2 , with a porosity of 80% and an air resistance of 11mm H 2 O, carbon paper with a bending radius of 10cm is used as the carbon material substrate, completely immersed in concentrated nitric acid, heated in an oil bath to 90°C for 3 hours for oxidation, and the oxidized carbon material is obtained. After cooling to room temperature, rinse with deionized water until the rinse solution The pH value was 7 to obtain the oxidized carbon material after washing.

[0060] (2) Mix acrylic acid, acrylonitrile and N,N-dimethylformamide at a volume ratio of 1:4:4 to obtain a mixed solution, and completely immerse the carbon oxide material after washing in step (1) in the mixed solution , the oil bath was heated to 80° C., refluxed and stirred for 24 hours, and dried ...

Embodiment 2

[0071] A working electrode for adsorbing metal ions in waste water, the preparation method steps of the working electrode are as follows:

[0072] (1) The thickness of 0.5g dried is 0.3mm, the size is 32cm×16cm, and the unit weight is 160g / m 2 , longitudinal resistance 0.12×10 -2 The Ω carbon cloth is used as the carbon material substrate, completely submerged in concentrated nitric acid, heated to 80°C in an oil bath for 4 hours for oxidation, and the oxidized carbon material is obtained. After cooling to room temperature, rinse with deionized water until the pH of the rinse solution is 5 , to obtain the oxidized carbon material after washing.

[0073] (2) Mix acrylic acid, acrylonitrile and N,N-dimethylformamide at a volume ratio of 1:4:4 to obtain a mixed solution, and completely immerse the carbon oxide material after washing in step (1) in the mixed solution , the oil bath was heated to 82° C., refluxed, stirred and reacted for 30 h, and dried to obtain a nitrile-ylated...

Embodiment 3

[0084] A working electrode for adsorbing metal ions in waste water, the preparation method steps of the working electrode are as follows:

[0085] (1) The thickness of 0.5g dried is 0.3mm, the size is 32cm×16cm, and the unit weight is 160g / m 2 , longitudinal resistance 0.12×10 -2 The Ω carbon cloth is used as the carbon material substrate, completely immersed in concentrated nitric acid, heated in an oil bath to 100°C for 3 hours to react for oxidation, and the carbon oxide material is obtained. After cooling to room temperature, rinse with deionized water until the pH of the rinse solution is 6 , to obtain the oxidized carbon material after washing.

[0086] (2) Mix acrylic acid, acrylonitrile and N,N-dimethylformamide at a volume ratio of 1:4:4 to obtain a mixed solution, and completely immerse the carbon oxide material after washing in step (1) in the mixed solution , the oil bath was heated to 78° C., refluxed and stirred for 27 hours, and dried to obtain a nitrile carbo...

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Abstract

The invention relates to a working electrode, an electro-adsorption system and an electro-adsorption method for adsorbing metal ions in wastewater, and belongs to the technical field of electro-adsorption chemical engineering. The working electrode is formed by taking carbon cloth or carbon paper as a substrate, taking amidoxime as a functional group and taking an oxygen-containing group as a connecting site through grafting; wherein the working electrode is prepared by an oxidation-cyanation-oximation three-step method. The working electrode can selectively adsorb various metal ions in the acid wastewater, and the adsorption effect is good; after the reaction is completed, the metal ions adsorbed on the working electrode can be desorbed by applying reverse voltage, so that recovery is realized. The electro-adsorption system comprises an electric signal generator and an electro-adsorption reaction tank; the electro-adsorption reaction tank comprises the working electrode and a counter electrode; meanwhile, the electro-adsorption system is controllable in technical parameters, simple and convenient to operate and capable of realizing efficient electro-adsorption reaction. The method is carried out by adopting the electro-adsorption system, and a plurality of metal ions in the acid wastewater are effectively adsorbed by utilizing a square wave periodic electric field.

Description

technical field [0001] The invention relates to a working electrode, an electric adsorption system and a method for adsorbing metal ions in wastewater, in particular, to a method for selectively adsorbing and recovering acidic wastewater by using a square wave periodic electric field, such as nuclear industrial wastewater, uranium ore The invention relates to a working electrode, an electro-adsorption system and a method for various metal ions contained in leaching solution, acid waste water of iron and steel industry, and rare-earth smelting waste water, and belongs to the technical field of electro-adsorption chemical engineering. Background technique [0002] With the development of China's nuclear power industry, the separation of resources such as uranium, thorium and zirconium from nuclear industry wastewater is an important purpose of the nuclear fuel cycle. In addition, operations involving uranium resources such as mining, smelting, and purification will produce aci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/469C02F101/20
CPCC02F1/469C02F2101/20
Inventor 张东翔潘萌唐威务张子磊谢钟音张丹
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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