A system for the electrocatalytic removal of nitrate nitrogen from water coupled with a bioanode
A technology of nitrate nitrogen and biological anode, which is applied in the field of construction of double-chamber electrochemical system, can solve the problems of many by-products, poor nitrogen selectivity, and high catalyst cost, and achieves strong hydrogen absorption capacity, high safety, and simple operation. Effect
Active Publication Date: 2017-12-22
DALIAN UNIV OF TECH
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[0006] The purpose of the present invention is to provide a system for electrocatalytic removal of nitrate nitrogen in water coupled with biological anodes, which solves the problems of high catalyst cost, additional power supply and hydrogen protons, many by-products and poor nitrogen selectivity in the process of electrocatalytic reduction of nitrate nitrogen question
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[0026] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings.
[0027] 1. Catalytic cathode preparation: Add 27ml tetrabutyl titanate, 23ml absolute ethanol, and 3.3ml hydrochloric acid to the beaker in turn, stir to dissolve tetrabutyl titanate, keep stirring, add 2.7ml Pdcl dropwise 2 、CuSO 4 Mixed solution, PdCl 2 、CuSO 4 The dosage is calculated according to the required ratio, Pd: Cu=4:1. Continue stirring for 12 hours to complete the hydrolysis and form a uniform and transparent orange-yellow sol. Take 4mL of the prepared sol and apply it evenly on a clean 4cm×5cm carbon fiber cloth, air-dry it and place it in a tube furnace, blow nitrogen gas at a flow rate of 30ml / min, and raise the temperature to 450°C, 650°C, and 850°C at a rate of 5°C / min Maintained for 2h, cooled naturally to room temperature, and the electrocatalytic electrode was prepared.
[0028] 2. Anode of...
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Abstract
A system for removing nitrate nitrogen from water by electrocatalysis coupled with a biological anode belongs to the technical field of water quality purification and energy recovery and utilization. It is characterized in that tetrabutyl titanate and metal salt solution are hydrolyzed into gel under acidic conditions, coated on carbon fiber cloth substrate, and metal-doped TiO2 gel electrode is obtained by calcining. The electrons and protons produced by electrogenic bacteria degrading organic pollutants in the bioanode are used for electrocatalytic reduction of nitrate nitrogen at the cathode, and the reduction of nitrate nitrogen to nitrogen gas is removed from the water body without any additional material and energy consumption. The effect and benefit of the present invention are to reduce the cost of the cathode catalyst, and use the anode electricity-producing microorganisms to degrade the organic pollutants to generate electrons and protons for the cathode reduction reaction. No external power supply is needed during the reaction, and no additional substances are needed to the reaction system, which saves costs and achieves The purpose of energy saving and environmental protection.
Description
technical field [0001] The invention belongs to the technical field of water quality purification and energy recovery and utilization, and relates to the conversion of chemical energy in sewage into electrical energy by microorganisms, the preparation of cathode electrocatalytic catalysts, the loading of catalysts on carbon fiber cloth substrates, and the construction of a double-chamber electrochemical system. It particularly relates to the reduction of nitrate nitrogen in water to nitrogen gas by using electrons and proton hydrogen produced by microorganisms under the action of catalytic electrodes. Background technique [0002] In recent years, nitrate pollution in global water bodies has become increasingly serious. The electrocatalytic method is safe, easy to operate, and does not require the addition of other chemicals. It is an environmentally friendly method for degrading pollutants and has received widespread attention. However, the electrocatalytic process needs to...
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IPC IPC(8): C02F3/28
Inventor 柳丽芬秦保爱李亮杨凤林
Owner DALIAN UNIV OF TECH