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System for photocatalytic oxidation of ammonia nitrogen in water with double photoelectrodes

A catalytic oxidation and photocatalytic technology, which is applied in the direction of oxidized water/sewage treatment, special compound water treatment, light water/sewage treatment, etc., can solve the problems of low removal efficiency, poor nitrogen selectivity, and many by-products, and achieve improved catalytic performance. efficiency effect

Active Publication Date: 2016-11-16
DALIAN UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a system for removing ammoniacal nitrogen in water by photocatalytic fuel cell technology, which solves the problems of many by-products, low removal efficiency and poor nitrogen selectivity in the process of catalytic oxidation of ammoniacal nitrogen

Method used

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  • System for photocatalytic oxidation of ammonia nitrogen in water with double photoelectrodes
  • System for photocatalytic oxidation of ammonia nitrogen in water with double photoelectrodes
  • System for photocatalytic oxidation of ammonia nitrogen in water with double photoelectrodes

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Embodiment 1

[0024] Reactor anode catalyst preparation: take 5g TiO 2 Put the powder in a dry pot, place it in an oven, heat up to 350°C at 5°C per minute, and activate for 2 hours. Naturally cool to room temperature, grind in a mortar, and pass through a 400-mesh sieve for later use. Take molybdate (Na 2 MoO 4 ) 24mg and thiourea (H 2 NCSNH 2 ) 48mg was dissolved in 40mL deionized water and magnetically stirred for 30min. Add 0.4 g of titanium dioxide powder, stir magnetically for 30 min, and sonicate for 30 min. The mixture was transferred to a 50mL stainless steel reaction kettle and placed in an oven, the temperature was raised to 200°C at 5°C per minute, reacted for 12h, and cooled to room temperature naturally. The obtained powder was separated by centrifugation, washed three times with deionized water and ethanol respectively, placed in a vacuum drying oven, and dried at 80° C. for 6 h. After grinding, pass through a 120-mesh sieve for later use.

[0025] Reactor cathode cat...

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Abstract

The invention provides a system for photocatalytic oxidation of ammonia nitrogen in water with double photoelectrodes, and belongs to the technical field of water quality purification and energy recycling. An MoS2-TiO2 and MoS2-BiVO4 compound photocatalyst with a good effect is prepared from cheap commercial raw materials through a simple hydrothermal synthesis method; the photoelectrodes are prepared from silica sol adhesion catalyst powder with a stainless steel net as the substrate, photocatalytic oxidation is carried out on alkali wastewater under the light condition, and thus ammonia nitrogen in water is efficiently removed. The system has the advantages that visible light catalysis and fuel cells are combined, and thus electric energy is output while pollutants and ammonia nitrogen in water are efficiently degraded; visible light is efficiently utilized by the catalyst in reaction, so that energy consumption is lowered, and the purposes of energy conservation and environment protection are achieved.

Description

technical field [0001] The invention belongs to the technical field of water quality purification and energy recovery and utilization, and relates to the preparation of visible light-responsive photocatalysts and photocatalytic electrodes. The stainless steel mesh is used as the substrate of the photocatalytic electrode, and the active oxygen generated by the photocatalytic electrode under visible light is used to oxidize ammonia nitrogen in water into nitrogen gas. . Background technique [0002] Photocatalytic technology uses light energy to excite semiconductor catalysts to simultaneously generate photogenerated electrons and holes. The reduction of photogenerated electrons and the oxidation reaction caused by holes can eliminate various pollutants, such as the reduction reaction to remove metal ions in wastewater or reduce bromine. Acid radicals and nitrate nitrogen, etc.; Oxidation reactions occur, organic pollutants are degraded and finally form harmless substances suc...

Claims

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Application Information

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IPC IPC(8): C02F1/30C02F1/461C02F1/72B01J27/051
CPCB01J27/051C02F1/30C02F1/4672C02F2201/46C02F2305/10
Inventor 柳丽芬李亮高常飞杨凤林
Owner DALIAN UNIV OF TECH
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