Bifunctional electrode with nitrification and denitrification activity, preparation method and application thereof

A nitrification and denitrification, dual-function technology, applied in the field of bioelectrochemistry, can solve the problems of low energy utilization rate and high electrode production cost, and achieve the effect of improving CODcr removal rate and reducing production cost

Active Publication Date: 2017-10-27
重庆中科德馨环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a dual-function electrode that can effectively remove organic pollutants and nitrogen in wastewater, and can greatly improve the effective utilization of energy, and its preparation method and application , used to solve the problems of high production cost of electrodes and low effective utilization of energy in the prior art

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  • Bifunctional electrode with nitrification and denitrification activity, preparation method and application thereof
  • Bifunctional electrode with nitrification and denitrification activity, preparation method and application thereof
  • Bifunctional electrode with nitrification and denitrification activity, preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0059] The carbon cloth of the cathode in this example was purchased from Cetech Company, the model is WOS1002.

[0060] The preparation process of the Bio / Pt bifunctional electrode is as follows (Bio represents microorganisms with nitrification and denitrification, and Pt is the oxygen reduction catalyst platinum purchased from the market):

[0061] 1. Preparation of Pt cathode: Cut the carbon cloth into squares with a size of 3*3cm, soak in a solvent of absolute ethanol: acetone (V / V) ratio of 1:1 for 1 hour, and soak in 1mol / L HCl solution 1h, soak in 1mol / L NaOH solution for 1h to get a clean and impurity-free carbon cloth. After immersing in 10wt% PTFE for 1 hour, place it in an oven at 60°C to dry it, and place it in a muffle furnace to bake it at 370°C for 20 minutes to form a hydrophobic layer on the surface of the carbon cloth. The loading amount of Pt catalyst is taken as 0.5mg / cm 2 , that is, based on the calculation of 0.5mgPt catalyst loaded on the carbon cloth ...

Embodiment 2

[0085] The carbon paper for the cathode in this example was purchased from Cetech Company, the model is GDS210.

[0086] The preparation process of Bio / Au bifunctional electrode is as follows:

[0087] 1. Preparation of Au cathode: Cut the carbon paper into squares with a size of 3*3cm, soak in a solvent of absolute ethanol: acetone (V / V) 1:1 for 3 hours, and soak in 1mol / L HCl solution 3h, soak in 1mol / L NaOH solution for 3h to get clean carbon paper without impurities. After immersing in 10wt% PTFE for 3 hours, dry it in an oven at 80°C, and then bake it in a muffle furnace at 370°C for 15 minutes to form a hydrophobic layer on the surface of the carbon paper. The loading amount of Au catalyst is 0.1mg / cm 2 , that is, based on the calculation of 0.1mgAu catalyst loaded on each square centimeter of carbon paper, 9mg of 20wt% Au / C catalyst purchased from the market was weighed, that is, the mass percentage of Au was 20%, and 0.5mL / mg absolute ethanol was used as Dispersant,...

Embodiment 3

[0091] The carbon felt for the cathode in this example is purchased from Cetech Company, model number is GF065.

[0092] The preparation process of the Bio / NG bifunctional electrode is as follows:

[0093] 1. Preparation of graphite oxide (GO) material: Graphite oxide was prepared from natural flake graphite / carbon nanofiber material purchased from the market by the Hummers method, that is, a 250mL dry round bottom flask was placed in an ice bath, and 46ml concentrated Sulfuric acid (the mass fraction of sulfuric acid is 98%) and 0.5g sodium nitrate, mechanically stir this mixed solution, make sodium nitrate dissolve completely. When the temperature of the mixed solution is lower than 5°C, add 1g of graphite material, after mixing evenly, slowly add 3g of potassium permanganate, control the stirring speed and heating speed, so that the temperature of the reaction solution does not exceed 20°C. When the potassium permanganate was completely dissolved, the temperature of the wa...

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Abstract

The invention provides a difunctional electrode with nitrification and denitrification activity and a preparing method and application thereof. A carbon-based material is used as a conducting skeleton of the electrode, an abiological catalyst is loaded on the surface of the electrode to catalyze an oxygen reduction reaction, the electrode is placed in a negative pole chamber inoculated with nitrification and denitrification activity sludge, a system is started and operates until a stable biological membrane is formed on the surface of the electrode, and therefore pollutants in sewage can be removed while electric energy is effectively recovered. The abiological catalyst is used under the oxygen condition to realize the efficient oxygen reduction reaction of the electrode, and meanwhile nitrogen in the microorganism catalyzed sewage is removed. The preparing method of the difunctional electrode is simple, the energy recovery rate of the difunctional electrode is obviously larger than that of a single biological electrode, organics and the nitrogen in the sewage are effectively removed, and the removal speed is higher than that of a single abiological electrode and the biological electrode; the electrode can be used in a microbial fuel cell or other bioelectrochemistry reactors.

Description

technical field [0001] The invention relates to the field of bioelectrochemistry, in particular to a bifunctional electrode with nitrification and denitrification activity, a preparation method and application thereof. Background technique [0002] The electrode is the key component of the bioelectrochemical reactor, where the oxidation-reduction reaction of the solution occurs, and plays a conductive role. Loading different catalysts on the electrode surface can realize certain chemical reactions. Most of the existing electrodes use a single noble metal catalyst such as platinum, gold, manganese or electrochemically active biocatalysts. Single noble metal catalysts have high catalytic activity but high cost, and the catalytic activity is greatly affected by environmental conditions; although the cost of electrochemically active biocatalysts is greatly reduced, the effective utilization of energy, that is, the Coulombic efficiency is low. Therefore, a single electrode can ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/90H01M4/96H01M4/88H01M8/16
CPCH01M4/86H01M4/88H01M4/90H01M4/9083H01M4/96H01M8/16Y02E60/50
Inventor 刘鸿金小君刘元
Owner 重庆中科德馨环保科技有限公司
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