Method for treating nitrate nitrogen-containing wastewater based on Co3O4/Fe3O4/CNTs composite dispersed electrode

A technology for nitrate nitrogen and wastewater treatment, applied in water/sludge/sewage treatment, sterilization/microdynamics water/sewage treatment, water/sewage treatment, etc., can solve the problem of slow surface reaction kinetics and photoresponse range of catalysts Narrow, serious recombination of photogenerated carriers, etc., to achieve good application prospects, high reuse times, excellent stability and repeatability

Active Publication Date: 2022-01-04
NANJING INNOVATION CENT FOR ENVIRONMENTAL PROTECTION IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology has the advantages of high efficiency, sustainability, simple and safe operation, and green. However, at present, the photocatalytic degradation of nitrate is still common in the narrow photoresponse range of the catalyst, serious recombination of photogenerated carriers, slow surface reaction kinetics, and the need to add The hole sacrificial agent not only leads to an increase in cost, but also increases the content of organic carbon in the environment, causing secondary pollution

Method used

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  • Method for treating nitrate nitrogen-containing wastewater based on Co3O4/Fe3O4/CNTs composite dispersed electrode
  • Method for treating nitrate nitrogen-containing wastewater based on Co3O4/Fe3O4/CNTs composite dispersed electrode
  • Method for treating nitrate nitrogen-containing wastewater based on Co3O4/Fe3O4/CNTs composite dispersed electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0046] In this example, Co 3 o 4 / Fe 3 o 4 The preparation method of the / CNTs dispersed electrode is as follows:

[0047] S100. Add 120mg of carbon nanotubes into the immersion solution A, the immersion solution A includes 20-40mL ethylene glycol, 10-20mL polyethylene glycol, 1.0-2.0g CoCl 2 ·6H 2 O and 1.0-2.0 g FeCl 3 ·6H 2 O, mixed solution A is obtained; carbon nanotubes are preferably multi-walled carbon nanotubes;

[0048] S200, adding 3.0-4.0 g of sodium acetate into the mixed solution A, and ultrasonically treating it for 1.5-2.0 hours to obtain the mixed solution B;

[0049] S300, sealing the mixed solution B in a stainless steel reaction kettle with Teflon lining, and maintaining it at 200-250°C for 12-20h to obtain an intermediate product;

[0050] S400, washing the intermediate product with ethanol and water, and then drying at 60-90°C to obtain Co 3 o 4 / Fe 3 o 4 / CNTs dispersed electrode; vacuum pump can also be used to filter after washing to shorte...

Embodiment 2

[0054] The basic content of this embodiment is the same as that of embodiment 1, and its difference is: utilize the Co prepared by embodiment 1 3 o 4 / Fe 3 o 4 / CNTs dispersed electrodes are used to treat several groups of nitrate-nitrogen wastewater, among which the concentration of nitrate nitrogen in the nitrate-nitrogen wastewater is 200mg / L. co 3 o 4 / Fe3 o 4 The dosage of / CNTs dispersed electrode is 10g / L, the DC voltage is 8-12V, and the electrolysis time is 3h. Electrolyte was added to the experimental group so that the concentration of sodium chloride in the electrolyte was 1.2 g / L.

[0055] In this embodiment, the pHs in the electrolytes of experimental groups 6-11 were 2, 3, 5, 7, 9, and 11, respectively. Using the above treatment parameters to treat nitrate-nitrogen wastewater, the denitrification rates of experimental groups 6-11 were 85.32%, 87.39%, 95.64%, 90.32%, 89.35%, and 88.27%, respectively.

Embodiment 3

[0057] The basic content of this embodiment is the same as that of embodiment 1, and its difference is: utilize the Co prepared by embodiment 1 3 o 4 / Fe 3 o 4 / CNTs dispersed electrodes treat several groups of nitrate-nitrogen wastewater. The nitrate nitrogen concentration of the nitrate-nitrogen wastewater is 200mg / L, the pH is 5, the DC voltage is 8-12V, and the electrolysis time is 3h. Electrolyte was added to the experimental group so that the concentration of sodium chloride in the electrolyte was 1.2 g / L.

[0058] In this example, the Co in the electrolyte of experimental group 12-16 3 o 4 / Fe 3 o 4 The dosages of / CNTs dispersed electrodes are 1g / L, 2.5g / L, 5g / L, 10g / L, 15g / L respectively. Using the above treatment parameters to treat nitrate-nitrogen wastewater, the denitrification rates of experimental groups 6-11 were 86.32%, 94.31%, 95.12%, 96.01%, and 89.03%, respectively.

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Abstract

The invention discloses a method for treating nitrate nitrogen-containing wastewater based on Co3O4/Fe3O4/CNTs composite dispersed electrode, belonging to the field of sewage treatment. According to the method, a Co3O4/Fe3O4/CNTs composite material is used as the dispersed electrode, and nitrate in water is treated via a three-dimensional electrode electrolytic bath and by adding chlorine salt electrolyte into wastewater in the electrolytic bath. According to the invention, the magnetism and catalytic performance of Fe3O4 are cooperated with the good catalytic performance of Co3O4 on nitrate nitrogen, and the chlorine-containing electrolyte is combined, so a high mass transfer rate can be realized, relatively high current intensity can be provided at relatively low current density, and the method has the advantages of high current efficiency, good treatment effect, large treatment capacity and low energy consumption.

Description

technical field [0001] The invention belongs to the field of sewage treatment, more specifically, the invention discloses a 3 o 4 / Fe 3 o 4 / CNTs composite dispersed electrode for the treatment of wastewater containing nitrate nitrogen. Background technique [0002] With the rapid development of agriculture and industrialization, wastewater or sewage polluted by a large amount of nitrogenous substances is directly discharged into natural water bodies, which has brought great harm and impact to human health and the sustainability of the ecosystem. Among them, nitrate, as the most stable nitrogenous substance in the environment, is widely found in surface water and groundwater. Unfortunately, a higher concentration of nitrate in water will bring a series of negative impacts on the human body and the ecosystem. For example, lakes or oceans with a higher concentration of nitrate may easily lead to algal blooms and red tides, breaking the principle of Some ecological balance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/467C02F101/16
CPCC02F1/461C02F1/46109C02F1/46114C02F1/4672C02F1/4676C02F2101/163C02F2001/46133
Inventor 姜笔存谈艳潘阳戴祖明
Owner NANJING INNOVATION CENT FOR ENVIRONMENTAL PROTECTION IND
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