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Electrochemical method for treating copper-containing wastewater by amidoximation porous carbon electrode

A porous carbon electrode, amidoxime technology, which is applied in chemical instruments and methods, metallurgical wastewater treatment, water/sewage treatment, etc., can solve the problems of short service life, high cost, secondary pollution treatment costs, etc., and achieve low energy consumption. Effect

Active Publication Date: 2021-12-31
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of these methods have the disadvantages of secondary pollution and expensive treatment.
The oxidation-reduction method generally has low treatment effect on copper complexes and the treatment efficiency decreases significantly over time
Membrane filtration requires large-scale operating costs and maintenance costs, and is not suitable for large-scale applications. Adsorbents are generally divided into activated carbon adsorbents, mineral material adsorbents, and biological adsorbents. The adsorption method is simple to operate, but the cost is high and the service life is short. Not conducive to large-scale engineering applications

Method used

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  • Electrochemical method for treating copper-containing wastewater by amidoximation porous carbon electrode
  • Electrochemical method for treating copper-containing wastewater by amidoximation porous carbon electrode

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preparation example Construction

[0039] (3) Preparation of coating solution

[0040]Weigh 75g of N,N-dimethylamide (DMF) in a 250mL beaker with an electronic balance, then weigh 2.5g of dried polyacrylonitrile powder (PAN molecular weight 150,000), slowly mix the PAN with a glass rod The powder was added into DMF, and then the beaker was placed on a magnetic stirrer and stirred for 24 hours until the PAN was completely dissolved and the solution turned pale yellow to obtain a coating solution.

[0041] (4) Porous carbon material loaded PAN

[0042] Put the pretreated porous carbon material into a 250mL beaker filled with coating solution, and place the beaker in an ultrasonic cleaner for 5 minutes to allow the coating solution to fully penetrate into the porous carbon material. Then take out the beaker and let it stand for 5 minutes, so that the coating liquid can be deposited and bonded on the porous carbon material. After standing still, take out the porous carbon material and place it in an evaporating d...

Embodiment 1

[0047] This embodiment is an electrochemical method for treating copper-containing wastewater with an amidoxime porous carbon electrode. It is tested in an asymmetric alternating current (frequency 400Hz, high potential+5V, 20% of the time, and low potential-10V, 80% of the time. ) to the recovery effect of divalent copper ions, specifically according to the following steps:

[0048] An amidoximated porous carbon electrode with a size of 1.7cm×2.2cm and a bare polyacrylonitrile-based carbon felt electrode were fixed on the electrolytic cell as the cathode and anode, and 40mL of Cu with a concentration of 1g / L was injected with a syringe. 2+ The solution is injected into the Perspex electrolysis cell. Adjust the mode of the electrical signal generator to AC mode, asymmetrical AC (frequency 400Hz, high potential +5V, 20% of the time, low potential -10V, 80% of the time), as the power supply, the effect of the solution on the pump Down flow, electrolysis 4h. The copper-containi...

Embodiment 2

[0051] An electrochemical method for treating copper-containing wastewater with an amidoxime porous carbon electrode, the steps are the same as in Example 1, the difference is that (frequency 300Hz, high potential+3V, 30% of the time, low potential-3V, time 70%). The recovery rate was 95.74%.

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Abstract

The invention discloses an electrochemical method for treating copper-containing wastewater through an amidoximation porous carbon electrode, and belongs to the technical field of copper-containing wastewater treatment. The method comprises the following steps that an amidoximation reaction is conducted on polyacrylonitrile loaded on a porous carbon material to prepare the amidoximation porous carbon electrode; then the electrode is used as a cathode, a porous carbon material is used as an anode, copper-containing wastewater is treated by adopting an electrochemical reaction with asymmetric alternating current, and metal copper is directly recovered on the working electrode. According to the method, the copper metal is successfully recovered through the strong chelating property of the amidoxime functional group on the copper ions and an electrodeposition method, meanwhile, the emission concentration of the copper ions can be reduced, operation is easy, cost is low, and good economic benefits and environmental benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of copper-containing wastewater treatment, and in particular relates to an electrochemical method for treating copper-containing wastewater with an amidoxime porous carbon electrode. Background technique [0002] With the development of my country's economy and the deepening of industrialization in recent years, the domestic electroplating production industry has made great progress. The electroplating production industry itself is a heavily polluting industry. The electroplating wastewater generated in the production process contains a large amount of heavy metal ions. For example, toxic and harmful substances include suspended solids such as cadmium, lead, chromium, nickel, and copper. The direct discharge of electroplating wastewater will cause serious pollution. The ecological environment has caused serious harm. In order to make the electroplating wastewater meet the discharge standard, it is necessary ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F101/20C02F103/16
CPCC02F1/46109C02F2001/46133C02F2001/46161C02F2101/20C02F2103/16Y02P10/20
Inventor 邓迪邓春健逯苏敏罗裕波曾桂生
Owner NANCHANG HANGKONG UNIVERSITY