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A kind of sodium borohydride modified biochar and its preparation method and application

A sodium borohydride and biochar technology, applied in biochemical equipment and methods, microorganism-based methods, microorganisms, etc., can solve problems such as affecting the extracellular electron transfer ability of iron-reducing bacteria, and achieve excellent extracellular electron transfer, environmental protection, etc. Friendly, low-cost effects

Active Publication Date: 2022-04-26
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, reducing agents are used to modify biochar to change its surface functional groups and affect the extracellular electron transfer ability of iron-reducing bacteria, but there are few reports on the potential impact on the dissimilatory iron reduction process.

Method used

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  • A kind of sodium borohydride modified biochar and its preparation method and application
  • A kind of sodium borohydride modified biochar and its preparation method and application
  • A kind of sodium borohydride modified biochar and its preparation method and application

Examples

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Effect test

Embodiment 1

[0033] A preparation method of sodium borohydride modified biochar, comprising the following steps:

[0034] (1) Place the dried rice straw in a tube furnace, and in a nitrogen protective atmosphere, raise the temperature of the biomass material to 600°C at a heating rate of 5°C / min for oxygen-limited high-temperature pyrolysis treatment for 1 hour, and cool to Take it out after room temperature, grind it, and pass through a 200-mesh sieve to prepare biochar.

[0035] According to the mass volume ratio of 1g: 100mL, mix the biochar prepared in step (1) with ultrapure water, stir evenly, let it stand for 24 hours, then wash it with ultrapure water until neutral, dry it for later use, and obtain the biochar before reaction. Carbon, denoted as WBC.

[0036] (2) The biochar prepared in step (1) was added into ultrapure water to obtain a biochar suspension, and the biochar concentration in the biochar suspension was 10 g / L.

[0037] (3) According to the mass ratio of biochar and ...

Embodiment 2

[0044] An application of sodium borohydride modified biochar in the reduction of ferric iron by iron-reducing bacteria, specifically using sodium borohydride modified biochar to promote the reduction of ferric iron by Geobacter, comprising the following steps:

[0045] In a 120mL serum bottle, add 0.5g of sodium borohydride modified biochar prepared in Example 1, 28mM ferric citrate, and 100mL Geobacter culture medium, and inoculate G .sulfurreducens were cultivated to complete the reduction treatment of ferric iron.

[0046] Blank group: the sodium borohydride modified biochar prepared in Example 1 was not added, and other conditions were the same as in Example 2.

[0047] Control group: the sodium borohydride modified biochar prepared in Example 1 was replaced by biochar, and other conditions were the same as in Example 2.

[0048] Determination of the concentration of ferrous iron, ferric iron and total iron in different systems, as well as the concentration of soluble fer...

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Abstract

The invention discloses a sodium borohydride modified biochar and its preparation method and application. The preparation method uses sodium borohydride as a reducing agent to reduce the biochar to prepare the sodium borohydride modified biochar. In the present invention, the oxygen-containing functional groups on the surface of the biochar are reduced by sodium borohydride, so that the biochar has more and stronger redox active groups, a lower potential, and a larger specific surface area, thereby preparing a biochar with a large specific surface area. , Strong electron transfer ability, good biocompatibility Sodium borohydride modified biochar, when used for iron reduction bacteria to reduce ferric iron, can accelerate the electron transfer efficiency of microorganisms, and then accelerate the iron reduction process in the biogeochemical cycle, The application prospect is good. At the same time, the preparation method of the sodium borohydride-modified biochar of the present invention has the advantages of simple process, low cost, environmental friendliness, etc., is suitable for large-scale preparation, and is beneficial to industrial application.

Description

technical field [0001] The invention belongs to the field of environmental materials, and relates to a sodium borohydride modified biochar, a preparation method and application thereof. Background technique [0002] Biochar is a recyclable material prepared by pyrolysis of biomass under a nitrogen atmosphere and is widely used as a soil conditioner. The types and functions of biochar are mainly related to firing conditions and modification methods. Among them, modification by physical and chemical methods can improve the performance of biochar. At present, acidic reagents, alkaline reagents, metal salts or metal oxides are mostly used to modify biochar. At present, reducing agents are used to modify biochar to change its surface functional groups and affect the extracellular electron transfer ability of iron-reducing bacteria, but there are few reports on the potential impact on the dissimilatory iron reduction process. Contents of the invention [0003] The technical pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05C12P3/00C12N1/20C12R1/01
CPCC01B32/05C12P3/00C12N1/20
Inventor 鲁玥胡英菊汤琳谢青青刘倩钟林芮傅蕾凌张绶娟
Owner HUNAN UNIV