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A method for treating ammonia nitrogen pollutants in water by activating sulfite with sulfide photoanode

A technology for activating sulfite and photoanode, which is applied in chemical instruments and methods, light water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problem of inability to remove ammonia species, etc., to facilitate degradation and avoid interaction Conversion and cost reduction effects

Active Publication Date: 2021-07-06
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, the outer electrons of the oxygen atom in the hydroxyl radical do not have suitable steric orbitals to combine with the nitrogen atom to extract electrons from ammonia
In addition, the complete removal of ammonia species from water cannot be achieved by using hydroxyl radicals because most of the ammonia nitrogen is oxidized by hydroxyl radicals to nitrite and nitrate ions instead of being converted to the more desirable product, nitrogen gas.

Method used

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  • A method for treating ammonia nitrogen pollutants in water by activating sulfite with sulfide photoanode
  • A method for treating ammonia nitrogen pollutants in water by activating sulfite with sulfide photoanode
  • A method for treating ammonia nitrogen pollutants in water by activating sulfite with sulfide photoanode

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Embodiment 1

[0035] The concentration of ammonia nitrogen in 100ml of water is 10mg / L, the concentration of sodium sulfite is 0.1M (pH=9~10), the bias voltage is 0.6V, and the air is slowly introduced to increase the dissolved oxygen in the water. cm 2 ) irradiation, using 1cm 2 The molybdenum disulfide electrode is used as the photoanode, and the graphite electrode is used as the cathode. After 6 hours of reaction in the photochemical reaction cell, the removal rate of ammonia nitrogen can reach 77%.

[0036] If no light source is used and the electrochemical reaction is only performed under the bias voltage of 0.6V, under the same conditions, the removal rate of ammonia nitrogen is only 27% after 6 hours of reaction. The corresponding changes in ammonia nitrogen concentration are shown in Figure 4 shown. Analysis diagram of ammonia nitrogen degradation products Figure 5 As shown, the results show that a small part of ammonia nitrogen is converted into nitrate nitrogen, and most of ...

Embodiment 2

[0038] The degradation effects of ammonia nitrogen under different pH conditions were compared. The concentration of ammonia nitrogen in 100ml of water is 20mg / L, the concentration of sodium sulfite is 0.1M, and the bias voltage is 0.6V, and the air is slowly introduced to increase the dissolved oxygen in the water. 2 ) irradiation, using 1cm 2 The molybdenum disulfide electrode is used as the photoanode, and the graphite electrode is used as the cathode. The pH of the solution is adjusted to 4, 7 and 10 by using 0.1M hydrochloric acid. After 6 hours of reaction in the photochemical reaction cell, the degradation rates of ammonia nitrogen are respectively 8%, 16% and 77%.

Embodiment 3

[0040] The degradation effects of ammonia nitrogen under different sodium sulfite concentrations were compared. The concentration of ammonia nitrogen in 100ml of water is 10mg / L (pH=9~10), and the bias voltage is 0.6V, and the air is slowly introduced to increase the dissolved oxygen in the water. 2 ) irradiation, using 1cm 2 The molybdenum disulfide electrode is used as the photoanode, and the graphite electrode is used as the cathode. When the concentration of sodium sulfite is 0.01M, 0.05M and 0.1M, the degradation rates of ammonia nitrogen after 6h in the photochemical reaction cell are 10%, 33% and 77% respectively. %.

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Abstract

The invention discloses a method for treating ammonia nitrogen pollutants in water by sulfide photoanode activating sulfite: under the irradiation of visible light, ultraviolet light or sunlight, the ammonia nitrogen wastewater in the photoelectrochemical pool is fed with air, and at the same time, the molybdenum disulfide electrode is used to As photoanode, graphite electrode as cathode applied voltage. The invention utilizes the oxygen-sulfur free radicals produced by photoelectric catalysis to activate sulfite to efficiently degrade ammonia nitrogen, the lower applied bias voltage and the irradiation of visible light greatly reduce the cost, and the product is mainly nitrogen, which avoids the occurrence of different valence states. The mutual conversion between nitrogen-containing compounds is more conducive to the complete removal of ammonia nitrogen pollutants.

Description

technical field [0001] The invention relates to a method for treating ammonia nitrogen pollutants in water, in particular to a method for treating ammonia nitrogen pollutants in water by activating sulfite with a sulfide photoanode. Background technique [0002] Ammonia nitrogen is a common pollutant in water bodies, and it is also the main source of unpleasant odors in polluted water bodies. High concentrations of ammonia nitrogen will cause eutrophication of water bodies, and will also cause more health risks to aquatic organisms, posing a huge threat to the environment and human health. At present, traditional technologies such as biological treatment, membrane separation, ion exchange, chemical oxidation, physical adsorption, and breakpoint chlorination are mainly used to degrade ammonia nitrogen. However, these technologies have certain shortcomings in terms of treatment cost and secondary pollution control. An effective, low-cost and environmentally friendly method fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/30C02F1/32C02F1/461C02F1/72
CPCC02F1/30C02F1/32C02F1/46109C02F1/725
Inventor 张冠凡祥
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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