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A kind of binary mesoporous-microporous hierarchical biochar based on lotus leaf and its preparation method and application

A binary mesoporous, bio-carbon technology, applied in carbon preparation/purification, structural parts, chemical instruments and methods, etc., can solve the problem that MFCs cannot really achieve commercial application, cannot be widely promoted and applied, and catalysts are expensive, etc. problem, to achieve the effect of excellent electrochemical performance, excellent electrochemical performance, and simple preparation method

Active Publication Date: 2021-11-16
FUJIAN AGRI & FORESTRY UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Traditional MFC cathode materials mainly use platinum (Pt) and its alloys as catalysts. Such catalysts are expensive, poor in chemical stability, poor in anti-interference performance, and have extremely limited natural reserves, which makes MFCs unable to be truly commercialized.
In recent years, carbon-based materials such as carbon nanotubes, carbon nanofibers, and graphene nanosheets have received extensive attention from scientific researchers. Studies have found that applying these carbon-based materials in MFCs can obtain greater power than platinum-carbon electrodes. Density, but these carbon-based materials generally have defects such as high production cost, complicated preparation process, and the need to use toxic organic raw materials, so they cannot be popularized and applied on a large scale

Method used

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  • A kind of binary mesoporous-microporous hierarchical biochar based on lotus leaf and its preparation method and application
  • A kind of binary mesoporous-microporous hierarchical biochar based on lotus leaf and its preparation method and application
  • A kind of binary mesoporous-microporous hierarchical biochar based on lotus leaf and its preparation method and application

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preparation example Construction

[0026] A preparation method of lotus leaf-based binary mesoporous-microporous hierarchical structure biochar, comprising the following steps:

[0027] 1) The lotus leaf is cleaned and dried;

[0028] 2) Add the dried lotus leaf and metal chloride-ammonium salt mixed solution into the reaction kettle, fill it with protective gas, raise the temperature to 100-200°C at a heating rate of 5-10°C / min, and perform hydrothermal carbonization;

[0029] 3) After drying the hydrothermally carbonized lotus leaves, put them into a carbonization furnace, fill them with protective gas, and carry out high-temperature carbonization at 700-1100° C. to obtain a biochar with binary mesoporous-microporous hierarchical structure based on lotus leaves.

[0030] Preferably, the lotus leaves in step 1) are lotus leaves in subtropical regions.

[0031] Preferably, the drying in step 1) is carried out at 35-75° C., and the drying time is 12-24 hours.

[0032] Preferably, the metal chloride in step 2) ...

Embodiment 1

[0043] A preparation method of lotus leaf-based binary mesoporous-microporous hierarchical structure biochar, comprising the following steps:

[0044] 1) Use deionized water and absolute ethanol to wash the lotus leaf (SEM image as shown in figure 1 shown) and cleaned, then cut into small pieces of 3.0cm×3.0cm, and dried in an oven at 40°C for 12 hours;

[0045] 2) Add the dried lotus leaf and zinc chloride-ammonium sulfate mixed solution (the molar ratio of zinc chloride to ammonium sulfate is 1:1, and the concentration of zinc chloride is 0.10mol / L) into the reactor, and fill it with nitrogen , and then heated up to 160°C at a heating rate of 10°C / min for 2 hours of hydrothermal carbonization;

[0046] 3) Put the hydrothermally carbonized lotus leaf in an oven to dry at 60°C for 2 hours, then add it to a carbonization furnace, fill it with nitrogen, and carry out high-temperature carbonization at 900°C for 2 hours to obtain a binary mesoporous-microporous multi-level struct...

Embodiment 2

[0050] A preparation method of lotus leaf-based binary mesoporous-microporous hierarchical structure biochar, comprising the following steps:

[0051] 1) Wash the lotus leaves with deionized water and absolute ethanol, cut them into small pieces of 3.0cm×3.0cm, and dry them in an oven at 35°C for 15 hours;

[0052] 2) Add the dried lotus leaf and zinc chloride-ammonium sulfate mixed solution (the molar ratio of zinc chloride to ammonium sulfate is 1:2, and the concentration of zinc chloride is 0.07mol / L) into the reactor, and fill it with nitrogen , and then heated up to 200°C at a heating rate of 8°C / min for 2 hours of hydrothermal carbonization;

[0053] 3) The hydrothermally carbonized lotus leaves were dried in an oven at 60°C for 2 hours, then added to a carbonization furnace, filled with nitrogen, and subjected to high-temperature carbonization at 800°C for 5 hours to obtain a binary mesoporous-microporous multi-level structure based on lotus leaves Structural biochar. ...

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Abstract

The invention discloses a lotus leaf-based biochar with binary mesoporous-microporous multi-level structure and its preparation method and application. The preparation method of the biochar is as follows: 1) cleaning and drying lotus leaves; 2) Carrying out hydrothermal carbonization to the dried lotus leaves; 3) Carrying out high-temperature carbonization to the hydrothermal carbonized lotus leaves. The lotus leaf-based binary mesoporous-microporous multi-level structure biological carbon of the present invention has a large specific surface area, and the surface is modified with carbon microspheres co-doped with nitrogen and sulfur. It has super-hydrophobic properties and excellent electrochemical performance. The preparation method is simple and the cost is low, and its application in microbial fuel cells can obtain higher chemical stability than traditional Pt / C electrodes, and the battery power density is higher than that of Pt / C electrodes.

Description

technical field [0001] The invention relates to a lotus leaf-based binary mesoporous-microporous hierarchical biochar, a preparation method and application thereof. Background technique [0002] In the microbial fuel cell (MFC, microbial fuel cell) system, the oxygen reduction reaction (Oxygen reduction reaction, ORR) in the cathode chamber is very important, and it needs to be catalyzed by an efficient catalyst to proceed smoothly, and the surface characteristics of the cathode material , porosity, and size structure all have a great influence on the catalytic performance of cathode materials. Therefore, it is necessary to use cathode materials with excellent structural properties, and the raw materials of cathode materials are required to be widely available, cheap and economical, simple to process and produce, and not to cause secondary pollution to the environment. [0003] Traditional MFC cathode materials mainly use platinum (Pt) and its alloys as catalysts. Such cata...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05C01B32/348C01B32/318H01M4/90H01M8/16
CPCC01B32/05C01B32/318C01B32/348H01M4/9091H01M8/16Y02E60/50
Inventor 叶文媛王亚军唐家桓周顺桂
Owner FUJIAN AGRI & FORESTRY UNIV
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