A system for coupling (photo)catalysis and MFC to remove nitrate nitrogen from water
A technology for nitrate nitrogen and water removal, applied in biochemical fuel cells, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problems of poor nitrogen selectivity and many by-products, save costs and improve reduction efficiency. Effect
Active Publication Date: 2017-12-22
DALIAN UNIV OF TECH
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[0007] The purpose of the present invention is to provide a system for coupling (photo) catalysis and microbial fuel cell technology (MFC) to remove nitrate nitrogen in water, which solves the problems of many by-products and poor nitrogen selectivity in the process of catalytic reduction of nitrate nitrogen
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[0029] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings.
[0030] Catalytic electrode preparation: g-C 3 N 4 Put the melamine powder in a crucible, cover it to prevent volatilization, put it in a muffle furnace and heat it up to 550°C at 5°C / min for 3 hours, take it out and grind it to 120 mesh to get g-C 3 N 4 spare. Add 27ml of butyl titanate, 23ml of absolute ethanol, 3.3ml of hydrochloric acid, and 2.7ml of ultrapure water into the beaker in sequence. Add 0.5g g-C 3 N 4 , ultrasonic 1h, stirred for 30 minutes to make a sol. The obtained sol was evenly spread on a clean 20cm×5cm carbon fiber cloth, air-dried, placed in a muffle furnace, heated to 350°C at 5°C / min for 2h, and cooled naturally to room temperature to prepare a photocatalytic electrode.
[0031] Reactor anode: The anode chamber is filled with activated carbon particles attached to a large number of Sh...
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The invention relates to a system for removing nitrate nitrogen in water by virtue of coupling (optical) catalysis and MFC and belongs to the technical field of water quality purification and energy recycling. The system is characterized in that a titanium dioxide compound graphitized nitrogen carbide optical catalyst which is excellent in effect is prepared from cheap melamine and mixed hydrolyzed butyl titanate by virtue of a calcining method. By taking carbon fiber cloth as a substrate which loads the catalyst to prepare an optical catalytic cathode and by taking electrochemically active microorganisms as an anode to provide electrons and protons required by reaction as well as by taking an organic matter methanol as a hole scavenger, nitrate nitrogen in water is efficiently reduced. The system provided by the invention has the benefits that (optical) catalysis and MFC are coupled to realize electric energy output while pollutants and nitrate nitrogen in water are efficiently degraded; no additional H+ needs to be added into a reactor, so that the cost is lowered, and the purpose of saving energy and protecting environment is 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. Carbon fiber cloth is used as a photocatalytic electrode base, and microorganisms are used to convert chemical energy in wastewater into electrical energy, while forming hydrogen protons, and utilizing the functions of electrons and catalytic electrodes. Reduction of nitrate nitrogen in water to nitrogen gas. Background technique [0002] Photocatalysis is to use light energy to excite semiconductor catalysts to generate photogenerated electrons and holes, and use the oxidation of holes and the reduction reaction caused by excited electrons to form species that can eliminate pollutants, such as oxidation and mineralization reactions, degradation of organic matter, and finally carbon dioxide; A reduction reaction occurs to reduce metal ions or nitrate nitrogen and broma...
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IPC IPC(8): C02F9/14H01M8/16
CPCY02E60/50
Inventor 柳丽芬李亮于婷婷杨凤林
Owner DALIAN UNIV OF TECH