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Method for producing acetic acid by utilizing self-assembly conductive biological membrane electrode to reduce carbon dioxide

A technology of biofilm electrode and carbon dioxide, which is applied in the direction of using microorganisms, methods based on microorganisms, biochemical equipment and methods, etc., can solve the problem of poor electrical conductivity of biofilms and the inability of electroautotrophic microorganisms to obtain sufficient and efficient Transfer electrons and other issues to achieve the effect of improving electron transfer rate, strengthening efficiency, and simple preparation process

Inactive Publication Date: 2017-07-07
NANJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the conductivity of the biofilm itself is not good, and it cannot transfer electrons efficiently, so that electroautotrophic microorganisms cannot obtain enough electrons to reduce CO 2 , which is the main bottleneck of low MES production efficiency

Method used

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  • Method for producing acetic acid by utilizing self-assembly conductive biological membrane electrode to reduce carbon dioxide
  • Method for producing acetic acid by utilizing self-assembly conductive biological membrane electrode to reduce carbon dioxide
  • Method for producing acetic acid by utilizing self-assembly conductive biological membrane electrode to reduce carbon dioxide

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1: the domestication of aerobic microorganisms, the specific domestication steps are as follows:

[0029] Add the anaerobic sludge to the solution rich in medium, add a certain amount of inoculum to the pre-passed H 2 , CO 2 The proportion is in the anaerobic bottle of the mixed gas of 80:20, and culture medium is PETC solution, wherein the prescription of PETC solution is: 1g / LNH 4 Cl, 0.1g / L KCl, 0.2g / L MgSO 4 ·7H 2 O, 0.8g / L NaCl, 0.1g / L KH 2 PO 4 ,0.02g / L CaCl 2 ,1g / L NaHCO 3 ,pH=7.0.

[0030] Then add a 2% aqueous solution of methane chloride in a mass ratio, react for 7 days, then insert it into the above-mentioned anaerobic bottle with a 5% inoculum size, react for 5 days, then turn over again, after repeating 3 times, still press 5% of the inoculum amount was reversed, and the reaction time was reduced to 3 days, and then repeated 3 times, and then turned over with 5% of the inoculum amount, and the time was reduced to 1.5 days, and after repe...

Embodiment 2

[0031] Embodiment 2: Preparation of conductive biofilm electrode

[0032] Put the carbon felt as the electrode into the anaerobic bottle, the cathode solution is PETC solution, and inoculate 5% of the high-efficiency aerobic microorganisms obtained through (1) screening, and react with hydrogen and carbon dioxide (80 / 20, v / v) 7 Two days later, the reaction solution was replaced with a new PETC solution, and 0.5mg / ml of graphene oxide was added, and then H 2 , CO 2 The ratio of hydrogen and carbon dioxide is 80:20. After 5 days of reaction, the solution turns black, and the desired conductive biofilm electrode is obtained. figure 2For the prepared conductive biofilm electrode, it can be seen that the graphene wraps the microorganisms and is well attached to the carbon felt electrode.

Embodiment 3

[0033] Example 3: Bioelectrochemical reduction of carbon dioxide by conductive biofilm electrode to produce acetate

[0034] The specific assembly steps and operation of the bioelectrochemical device are as follows:

[0035] (1) Put the carbon felt anode and the prepared conductive biofilm electrode into the anode chamber and the cathode chamber respectively

[0036] (2) all add the PETC solution among the embodiment 1 in the anode chamber and the cathode chamber, add the potential of-1.05V (relative to silver / silver chloride) with potentiostat between the cathode and the anode, then continuously pass into 100% Carbon dioxide, the reaction temperature is 25°C.

[0037] Taking the carbon felt cathode without adding graphene in the manufacturing process as a control, its preparation method is the same as in Example 2, except that graphene oxide is not added, and all bioelectrochemical systems are continuously operated for 40 days, and samples are taken regularly to measure the ...

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Abstract

The invention discloses a method for producing acetic acid by utilizing a self-assembly conductive biological membrane electrode to reduce carbon dioxide. The method comprises the following steps: (1) adding an inhibitor chloromethane into an inoculum, continuously performing biological acclimatization under H2 / CO2 atmosphere and continuously shortening the turning time, thereby acquiring the acclimatized self-oxidation microorganism; and (2) taking a carbon felt as an electrode, inoculating the self-oxidation microorganism acquired in the step (1) and the culture medium suitable for microbial growth in the carbon felt, reacting for 5-7 days under H2 / CO2 atmosphere, replacing by a new culture medium, reacting for 3-5 days under the same atmosphere, thereby acquiring the conductive biological membrane electrode, and then generating acetic acid by using the conductive biological membrane electrode for performing bioelectrochemical reduction on carbon dioxide. The biological membrane electrode disclosed by the invention is simple in preparation process, is high in catalytic efficiency and is capable of effectively increasing the electron transfer rate of a biological cathode, so that the efficiency of generating acetic acid through the bioelectrochemical reduction of carbon dioxide can be increased.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, and in particular relates to a self-assembled conductive biofilm electrode and its preparation method and application. Background technique [0002] Energy fuels and other organic chemical products provided by petrochemical resources have supported the development of human economy and society for nearly 200 years. However, human abuse is depleting non-renewable fossil resources. Even more serious, there is growing evidence that the use of fossil fuels causes the greenhouse gas CO 2 emissions are linked to global climate change. On the other hand, CO 2 It is the most extensive and cheap carbon resource on earth. Therefore, the development will CO 2 Technologies converted to fuels or high-value chemicals will offer potential solutions for the supply of renewable energy and materials. [0003] In the existing CO 2 Among transformation technologies, Microbial Electrosynthesis (MES)...

Claims

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Application Information

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IPC IPC(8): C12P7/54C12N1/36C12R1/01
CPCC12N1/36C12P7/54
Inventor 谢婧婧宋天顺
Owner NANJING UNIV OF TECH
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