Carbon-based material and preparation method thereof

A carbon-based material and matrix technology, applied in the field of carbon-based materials and their preparation, can solve the problems of increasing the cost and complexity of a photothermal system, unfavorable to industrialized production, and large surface heat loss, achieving high-efficiency seawater desalination and reducing preparation costs. , Efficient use of efficient effects

Pending Publication Date: 2019-07-16
SHAANXI UNIV OF SCI & TECH
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  • Abstract
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  • Claims
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Problems solved by technology

[0006] The purpose of the present invention is to provide a carbon-based material and its preparation method, which solves the problem that the current technology of using solar energy to produce steam relies on the surface of the material to absorb solar radiation, and transfer the accumulated heat to bulk water directly or indirectly through the intermediate heat transfer fluid , because the light loss is high, the surface heat loss is large, or vacuum is required to reduce convective heat loss, which increases the cost and complexity of the photothermal system and is not conducive to large-scale industrial production

Method used

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  • Carbon-based material and preparation method thereof
  • Carbon-based material and preparation method thereof

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preparation example Construction

[0040] Such as figure 1 Shown, the preparation method of a kind of carbon-based material provided by the present invention comprises the following steps:

[0041] Step 1, mixing starch and water according to the mass percentage of 1: (1-1.5) to obtain preliminary materials;

[0042] Step 2, freeze-drying the obtained preliminary material at -50 to -70°C for 20 to 50 hours to obtain a preform;

[0043] Step 3, performing high-temperature carbonization on the preform obtained in step 2 to make a carbon foam matrix;

[0044] Step 4: Soak the carbon foam matrix prepared in step 3 in the dopamine solution, and then dry at room temperature to obtain the dopamine-deposited carbon foam matrix.

[0045] Further, in step 1, yeast is added to starch and water, wherein the mass percentage of starch, yeast and water is 1:1: (2-2.5), which is used to increase the adhesiveness of starch and water.

[0046] Further, the specific surface area of ​​the carbon foam matrix deposited by the dop...

Embodiment 1

[0061] A method for preparing a carbon-based material provided by the present invention comprises the following steps:

[0062] Step 1, mixing starch and water according to the mass percentage of 1:1 to obtain preliminary materials;

[0063] Step 2, freeze-drying the obtained preliminary material at -50°C for 20 hours; figure 2 is the microscopic morphology of the bulk material observed by XRD technology when it is not carbonized;

[0064] Step 3, performing high-temperature carbonization obtained in step 2 to make a carbon foam matrix;

[0065] There are three ways of high-temperature carbonization, choose one; the details are as follows:

[0066] (1) carbonization in argon, the temperature is 500°C, and the time is 1h;

[0067] (2) carbonization in air, the temperature is 300°C, and the time is 1h;

[0068] (3) Carbonization in vacuum at a temperature of 500° C. for 1 h.

[0069] Step 4, put the carbon foam matrix prepared in step 3 into the dopamine solution to soak f...

Embodiment 2

[0081] A method for preparing a carbon-based material provided by the present invention comprises the following steps:

[0082] Step 1, mixing starch and water according to the mass percentage of 1:1.2 to obtain preliminary materials;

[0083] Step 2, freeze-drying the obtained preliminary material at -50°C for 20 hours; figure 2 is the microscopic morphology of the bulk material observed by XRD technology when it is not carbonized;

[0084] Step 3, performing high-temperature carbonization obtained in step 2 to make a carbon foam matrix;

[0085] There are three ways of high-temperature carbonization, choose one; the details are as follows:

[0086] (1) carbonization in argon, the temperature is 800°C, and the time is 1.5h;

[0087] (2) carbonization in the air, the temperature is 500°C, and the time is 1.5h;

[0088] (3) Carbonization in vacuum, the temperature is 700°C, and the time is 1.5h.

[0089] Step 4, put the carbon foam matrix prepared in step 3 into the dopam...

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Abstract

The invention provides a carbon-based material and a preparation method thereof. The preparation method comprises the following steps: step 1, mixing starch and water according to a mass percentage ratio of 1:(1-1.5) to obtain a primary material; step 2, carrying out freeze drying on the obtained primary material at a temperature of from -50 DEG C to-70 DEG C for 20-50 hours; step 3, carrying outhigh-temperature carbonization on the material obtained in the step 2 to prepare a carbon foam substrate; and step 4, soaking the carbon foam substrate prepared in the step 3 into a dopamine solutionfor 24-48 hours, then carrying out drying at room temperature to obtain the dopamine-deposited carbon foam substrate. The carbon-based material prepared by mixing the starch and the water is a naturalporous structure formed after a flour sample is carbonized, and the structure has special significance for interfacial photo-thermal conversion.

Description

technical field [0001] The invention relates to the field of interface solar seawater desalination, in particular to a carbon-based material and a preparation method thereof. Background technique [0002] Solar energy is a typical clean and environmentally friendly energy source, which can be used as an alternative energy source to solve environmental pollution and energy crisis. Therefore, it has attracted great attention from relevant scientific and social groups around the world. Moreover, it has been widely used in many fields, such as hydrogen production, solar thermal power generation, photovoltaic cells, photocatalysis, water purification, etc. [0003] Desalination of seawater refers to the process of separating dissolved mineral salts, organic matter, bacteria and viruses, and solids in seawater to obtain fresh water that people can drink and use. From the perspective of energy conversion, it is the process of converting other energy into brine separation energy. ...

Claims

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Application Information

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IPC IPC(8): C01B32/05F24S70/10C02F1/14C02F103/08
CPCC01B32/05C02F1/14C02F2103/08Y02A20/142Y02A20/212Y02A20/124
Inventor 王成兵李泽宇李政通王伟苏进步凌三王九龙
Owner SHAANXI UNIV OF SCI & TECH
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