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Photoelectric methane production biocatalyst with sandwich structure as well as preparation method and application of photoelectric methane production biocatalyst

A biocatalyst and methanogenic technology, applied in biochemical equipment and methods, microorganism-based methods, physical/chemical process catalysts, etc., can solve the insufficient photocatalytic activity of the Schottky barrier and limit the large-scale practical use of metal catalysts , high cost of preparation and use, etc., to achieve excellent environmental compatibility and light stability, high universality and promotion value, and simple and easy operation

Active Publication Date: 2022-02-25
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in related technologies, metal catalysts still have huge technical defects such as a single catalytic site, insufficient photocatalytic activity caused by too high or too low Schottky barrier, and non-photosynthetic organisms need to have the function of directly receiving photogenerated electrons.
In addition, most of the metal catalysts used tend to be noble metals (such as expensive and rare Au, Ag, Pt, Pd), which have disadvantages such as high cost of preparation and use, which greatly limits the application of metal catalysts in photoelectrochemistry. Possibility of practical use at scale

Method used

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  • Photoelectric methane production biocatalyst with sandwich structure as well as preparation method and application of photoelectric methane production biocatalyst
  • Photoelectric methane production biocatalyst with sandwich structure as well as preparation method and application of photoelectric methane production biocatalyst
  • Photoelectric methane production biocatalyst with sandwich structure as well as preparation method and application of photoelectric methane production biocatalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0075] In this example, a photoelectric methanogenic biocatalyst with a sandwich structure was prepared.

[0076] In this example, Methanosarcina barkeri is used as a typical methanogen to prepare a sandwich-structured photoelectric methanogenic biocatalyst. The specific preparation method is as follows:

[0077] (1) Pretreatment and material preparation:

[0078] ①Strain culture:

[0079] Prepare medium containing carbon source (MgCl 2 ·6H 2 O 0.4g / L, CaCl 2 2H 2 O 0.1g / L, NH 4 Cl 0.1g / L, KH 2 PO 4 0.2g / L, KCl 0.5g / L, HEPES 7.16g / L, NaHCO 3 2.52g / L, Na 2 S·9H 2 O 0.24g / L, NaAc2.788g / L, Cysteine-HCl 0.5wt%, Trace element solution SL-10 1mL, Selenite-tungastate solution 1mL, Vitamin solution 3mL), then Methanosarcina barkeri was inoculated into the medium for cultivation ( The temperature is 37° C., and the incubation time is 6 d), to obtain the bacterial liquid. Among them, the volume ratio of the inoculation amount of Methanosarcinabarkeri to the medium is 1:10....

Embodiment 2

[0090] The preparation method in Example 2 is the same as that in Example 1, except that the inorganic medium in step (2) is replaced with an equal amount of sterilized natural water from the paddy field (Jinshan Campus, Fujian Agriculture and Forestry University).

Embodiment 3

[0092] The preparation method in Example 3 is the same as that in Example 1, except that the inorganic medium in step (2) is replaced with an equal amount of sterilized natural water from wetlands (Minhou County, Fuzhou City, Fujian Province).

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Abstract

The invention discloses a photoelectric methane production biocatalyst with a sandwich structure and a preparation method and application thereof, and the photoelectric methane production biocatalyst sequentially comprises: a microbial core, which is a methanogens; a bimetal intermediate layer which is coated on the surface of the microbial core; a nano semiconductor shell which is arranged on one side, far away from the microbial core, of the bimetallic intermediate layer through electrostatic adsorption. The photoelectric methane production biocatalyst with the sandwich structure can take ubiquitous sunlight as driving force, the defects of low interface electron transfer efficiency, insufficient photoelectron conversion efficiency, low quantum efficiency and the like of a traditional biological photoelectric system are overcome, and the maximum quantum efficiency of the photoelectric methane production biocatalyst reaches 13.0% or above. In addition, the prepared photoelectric methane production biocatalyst with the sandwich structure can normally operate under the natural environment condition, and has high universality and popularization value.

Description

technical field [0001] The invention belongs to the field of biocatalysts, and in particular relates to a photoelectric methanogenic biocatalyst with a sandwich structure and a preparation method and application thereof. Background technique [0002] carbon dioxide (CO 2 ) into low-carbon biofuels with high added value is an important strategy to alleviate the global carbon emission pressure and energy shortage. Biophotoelectrochemical methanogenesis (BPEC) is a specific conversion of solar energy to methane by utilizing the high specific catalytic ability of non-photosynthetic organisms and the superior light-harvesting performance of photosensitizers. However, the current existing technologies cannot effectively solve the problem of photogenerated electron transfer and utilization efficiency at the interface between non-photosynthetic microorganisms and photosensitizers, resulting in low methane generation efficiency and sustainability, and the promotion and application o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N11/14C12N1/20C12P5/02B01J27/043B22F9/24B22F1/18C12R1/01
CPCC12N11/14C12N1/20C12P5/023B01J27/043B22F9/24B01J35/396Y02E50/30
Inventor 叶捷王超周顺桂
Owner FUJIAN AGRI & FORESTRY UNIV