CN111249757A - Carbon fiber photothermal conversion material and its use in purification and recovery of multi-media solvent - Google Patents

Abstract

The invention discloses a carbon fiber photothermal conversion material and application thereof in purifying and recovering a multi-medium solvent. The carbon fiber photothermal conversion material comprises carbon fibers, and continuous hydrothermal carbon layers are grown on the surfaces of the carbon fibers in situ. The use comprises the following steps: the multi-medium solvent system is contacted with the carbon fiber photothermal conversion material, and the carbon fiber photothermal conversion material is irradiated by set light rays, so that the carbon fiber photothermal conversion material is subjected to photothermal conversion and generates heat energy, at least part of the solvent in the multi-medium solvent system is promoted to be heated and evaporated, and the purification and recovery of the multi-medium solvent system are realized. The high-efficiency carbon fiber photothermal conversion material has high specific surface area, high roughness and a large number of functional groups, has high-efficiency solar energy conversion efficiency in photothermal conversion application, can be used for solar energy high-efficiency desalination and rapid water evaporation, and also has high-efficiency and stable separation performance in multi-medium solvent systems such as sewage medium, seawater, organic solvent purification, oil-water separation and the like.

Description

Carbon fiber photothermal conversion material and its use in purification and recovery of multi-media solvent

technical field

The invention relates to a method for purifying and recovering a multi-media solvent, in particular to a method for using high-efficiency carbon fiber as a photothermal conversion material, and purifying and recovering a solvent through solar solvent evaporation, belonging to the technical fields of material chemistry and solar energy conversion.

Background technique

As a clean and renewable green energy, solar energy has become the focus of energy utilization in recent years, and solar thermal conversion membrane distillation technology is considered as an economical and effective solution. At present, the solar solvent purification technology mainly based on the distillation method generally has problems such as low photothermal conversion efficiency and poor stability, that is, the salt analysis leads to the aging of the evaporation device and the poor resistance to organic solvents. Therefore, most of the research on photothermal conversion technology focuses on In seawater desalination, sewage treatment and so on.

Organic solvent is an organic compound widely used in life and production, with a small molecular weight, which exists in coatings, adhesives, lacquers and cleaners. There are many kinds of organic solvents, which are widely used and used in huge amounts. Organic solvents are discharged into the environment without treatment, which not only has toxic and side effects, but also produces acid smog and photochemical smog in the troposphere of the atmosphere. The safety of human and animal life. The existing organic solvent purification and recovery treatment methods cannot be refined or have very low refining efficiency, have no economic benefits, and are not in line with the development trend of low carbon.

Research and develop organic solvent-resistant, high-concentration salt corrosion-resistant, high-efficiency photothermal conversion materials and photothermal conversion devices, which are widely used in the purification and recovery of various solvent media, breaking the technical barriers in this field, and will effectively promote the country's green and sustainable development. The development process has far-reaching strategic significance and good social benefits.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to provide a carbon fiber photothermal conversion material and a preparation method thereof, so as to overcome the deficiencies of the prior art.

Another object of the present invention is to provide the use of the carbon fiber photothermal conversion material in the purification and recovery of a multi-media solvent system.

Another object of the present invention is to provide a carbon fiber photothermal conversion device.

In order to realize the foregoing invention purpose, the technical scheme adopted in the present invention includes:

The embodiment of the present invention provides a preparation method of a carbon fiber photothermal conversion material, which includes: making a hydrothermal reaction solution containing carbon fiber and 0.01-10wt% carbon source at a temperature of 150-300°C and a pressure of 0.6-5MPa Under the condition of hydrothermal reaction for 1-24h, a continuous hydrothermal carbon layer is formed in situ on the surface of carbon fiber.

Further, the carbon source includes any one or a combination of two or more of water-soluble saccharides, water-soluble polysaccharides, and easily hydrolyzed polysaccharides.

Embodiments of the present invention also provide a carbon fiber photothermal conversion material, which includes carbon fibers, and a continuous hydrothermal carbon layer is grown on the surface of the carbon fibers in situ.

The embodiments of the present invention also provide the carbon fiber photothermal conversion material prepared by the foregoing method or the use of the foregoing carbon fiber photothermal conversion material in purifying and recovering a multi-media solvent system.

In some preferred embodiments, the use includes: contacting the multi-medium solvent system with the carbon fiber photothermal conversion material, and irradiating the carbon fiber photothermal conversion material with a set light, so that the carbon fiber photothermal conversion material performs photothermal conversion and Heat energy is generated, so that at least part of the solvent in the multi-media solvent system is heated and evaporated, so as to realize the purification and recovery of the multi-media solvent system.

An embodiment of the present invention also provides a carbon fiber photothermal conversion device, which includes the carbon fiber photothermal conversion material prepared by the foregoing method or the foregoing carbon fiber photothermal conversion material.

In some preferred embodiments, the carbon fiber light-to-heat conversion device includes a light-to-heat conversion film, a liquid container, and a condensation recovery unit, and the light-to-heat conversion film is woven from the carbon fiber light-to-heat conversion material. When the multi-media solvent system is contained, at least a local area of the photothermal conversion film floats on the liquid surface of the multi-media solvent system, and when the carbon fiber photothermal conversion material is irradiated with a set light, the carbon fiber The photothermal conversion material can perform photothermal conversion to promote at least part of the solvent in the multi-media solvent system to be heated and evaporated, and the condensation recovery unit is used for condensation recovery of the evaporated at least part of the solvent.

Compared with the prior art, the beneficial effects of the present invention are at least as follows:

The high-efficiency carbon fiber photothermal conversion material provided by the present invention has high specific surface area, high roughness and a large number of functional groups, and in the application of photothermal conversion, it has high solar energy conversion efficiency, not only can be used for efficient solar energy desalination, fast water evaporation, but also Due to the high strength, high chemical and structural stability, and resistance to organic solvents of high-efficiency carbon fiber photothermal conversion materials, it still has efficient and stable separation in multi-media solvent systems such as sewage media, seawater, organic solvent purification, and oil-water separation. performance. At the same time, the multi-medium solvent purification and recovery method provided by the invention is simple, has high evaporation efficiency, and is green and pollution-free; raw materials are readily available, which is very suitable for industrial production; and the carbon fiber photothermal conversion device is simple and easy to enlarge.

Description of drawings

FIG. 1 is a schematic structural diagram of a high-efficiency carbon fiber photothermal conversion device in a typical embodiment of the present invention.

Figure 2a is a scanning electron microscope image of the carbon fiber in Example 1 of the present invention.

2b is a scanning electron microscope image of the carbon fiber covered with the hydrothermal carbon layer in Example 1 of the present invention.

3 is the ultraviolet absorption spectrum of the dye before and after the evaporation of the dyeing solvent in the high-efficiency carbon fiber photothermal conversion device in Example 1 of the present invention.

FIG. 4 is a physical diagram of the high-efficiency carbon fiber photothermal conversion device in Example 2 of the present invention.

Explanation of reference numerals: 1-light-to-heat conversion film, 2-PS foam, 3-mixed solution container, 4-inclined condensation panel, 5-condensation box, 6-condensate outlet.

Detailed ways

As mentioned above, in view of the deficiencies of the prior art, the inventor of the present invention has proposed the technical solution of the present invention after long-term research and extensive practice, which mainly provides a high-efficiency carbon fiber light-to-heat conversion material and a light-to-heat conversion device, and a A multi-medium purification and recovery method, the method uses high-efficiency carbon fiber photothermal conversion materials and photothermal conversion devices to purify and recover multi-media solvent systems including sewage media, seawater, oil-water emulsion systems, printing and dyeing waste solvents, mixed solvent systems, and the like.

The technical solution, its implementation process and principle will be further explained as follows.

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

One aspect of the embodiments of the present invention provides a method for preparing a carbon fiber photothermal conversion material, comprising: making a hydrothermal reaction solution containing carbon fibers and 0.01-10wt% carbon source at a temperature of 150-300°C and a pressure of 0.6 Under the condition of ~5MPa, the hydrothermal reaction is carried out for 1 ~ 24h, so that a continuous hydrothermal carbon layer is formed in situ on the surface of the carbon fiber.

Wherein, the pressure of the reactor is 0.6～5MPa, and the temperature is 150～300℃.

Further, the carbon source includes a natural material carbon source: such as any one or a combination of two or more in water-soluble carbohydrates, water-soluble polysaccharides, and easily hydrolyzed polysaccharides, for example, can be preferably Glucose, sucrose, carboxymethyl cellulose, fructose, maltose, etc., but not limited thereto.

Another aspect of the embodiments of the present invention also provides a carbon fiber photothermal conversion material, which includes carbon fibers, and a continuous hydrothermal carbon layer is grown in-situ on the surfaces of the carbon fibers.

Further, the surface of the hydrothermal carbon layer has any one or a combination of functional groups of carbonyl, quinone and hydroxyl groups, the surface roughness of the hydrothermal carbon layer is 5-100 nm, and the hydrothermal carbon layer has a surface roughness of 5-100 nm. The specific surface area of the carbon layer is 1 to 5 m ² /g.

Among them, the hydrothermal carbon layer has high specific surface area, high roughness and a large number of functional groups, and has high solar energy conversion efficiency in photothermal conversion applications. It has the advantages of high strength, high chemical and structural stability, and resistance to organic solvents, and still has efficient and stable separation performance in multi-media solvent systems such as sewage media, seawater, organic solvent purification, and oil-water separation.

Another aspect of the embodiments of the present invention also provides the carbon fiber photothermal conversion material prepared by the foregoing method or the use of the foregoing carbon fiber photothermal conversion material in purifying and recovering a multi-media solvent system.

In some preferred embodiments, the use, that is, a method for purifying and recovering a multi-media solvent comprises: contacting the multi-media solvent system with the carbon fiber photothermal conversion material, and irradiating the carbon fiber photothermal conversion material with a set light, The carbon fiber photothermal conversion material is made to perform photothermal conversion and generate thermal energy, thereby promoting at least part of the solvent in the multi-media solvent system to be heated and evaporated, and realizing the purification and recovery of the multi-media solvent system.

Further, the set light is sunlight, but not limited thereto.

Further, the multi-media solvent system comprises a combination of at least one volatile solvent and at least one non-volatile or less volatile material solute or a combination of two or more solvents with different volatility, for example, it may preferably be a sewage medium, Seawater, brine, oil-water emulsion system, printing and dyeing waste organic solvent, mixed solvent system, etc., but not limited to this.

Further, the solvent in the multi-media solvent system can be water, organic solvent and the like.

Further, the carbon fiber light-to-heat conversion material is woven into a film shape.

In conclusion, the method for purifying and recovering the multi-medium solvent provided by the present invention is simple, has high evaporation efficiency, is green and pollution-free; the raw materials are readily available, and is very suitable for industrial production.

Another aspect of the embodiments of the present invention also provides a carbon fiber photothermal conversion device, which includes the carbon fiber photothermal conversion material prepared by the foregoing method or the foregoing carbon fiber photothermal conversion material.

In some preferred embodiments, the carbon fiber light-to-heat conversion device includes a light-to-heat conversion film, a liquid container, and a condensation recovery unit, and the light-to-heat conversion film is woven from the carbon fiber light-to-heat conversion material. When the multi-media solvent system is contained, at least a local area of the photothermal conversion film floats on the liquid surface of the multi-media solvent system, and when the carbon fiber photothermal conversion material is irradiated with a set light, the carbon fiber The photothermal conversion material can perform photothermal conversion to promote at least part of the solvent in the multi-media solvent system to be heated and evaporated, and the condensation recovery unit is used for condensation recovery of the evaporated at least part of the solvent.

Further, when the liquid container contains a multi-media solvent system, a local area of the light-to-heat conversion film floats on the liquid surface of the multi-media solvent system, and the rest of the area is located on the liquid surface of the multi-media solvent system. below.

In some preferred embodiments, the condensation recovery unit includes a condensation tank and a condensing panel arranged obliquely, the condensation panel is fastened at the open end of the upper part of the condensation tank, and the liquid container is placed in the condensation tank Inside the body, and the condensate box is also provided with a condensate outlet.

Further, the inclination angle of the condensation panel is 20-80°.

Further, at least a partial area of the light-to-heat conversion film is combined on the upper part of the floating body material to form a double-layer structure, and the density of the floating body material is lower than that of the multi-media solvent system.

Wherein, the floating body material has low density, low thermal conductivity, good heat insulation performance, and can float on the surface of the multi-media solvent system, preferably PS foam, but not limited to this, the carbon fiber photothermal conversion material around the PS foam extends into the in a multi-media solvent system.

Specifically, please refer to FIG. 1 , which is a schematic structural diagram of a carbon fiber light-to-heat conversion device in a typical embodiment of the present invention. The carbon fiber photothermal conversion device includes a photothermal conversion film 1 made of high-efficiency carbon fiber photothermal conversion material, a PS foam 2, a mixed solution container 3, an inclined condensing panel 4, a condensing box 5 and a condensate outlet 6.

The mixed solution container 3 is placed in the condensing box 5, the inclined condensing panel 4 is buckled at the open end of the upper part of the condensing box 5, and a bottom between the condensing box 5 and the mixed solution container 3 is provided with a Condensate outlet 6, the light-to-heat conversion film 1 made of carbon fiber light-to-heat conversion material is closely attached to the upper part of the PS foam 2 to form a double-layer structure, and the double-layer structure of the light-to-heat conversion film 1 and the PS foam 2 floats On the liquid surface of the mixed solution in the mixed solution container 3, the carbon fiber photothermal conversion material around the PS foam protrudes into the mixed solution.

Further, the PS foam has low density, low thermal conductivity and good thermal insulation performance, and can float on the surface of the mixed solution. The inclination angle α of the inclined condensing panel 4 is 20-80°.

To sum up, the carbon fiber photothermal conversion device provided by the present invention is simple and easy to enlarge.

The technical solution of the present invention will be further explained below with reference to some preferred embodiments and accompanying drawings, but the experimental conditions and setting parameters therein should not be regarded as limitations to the basic technical solution of the present invention. And the protection scope of the present invention is not limited to the following embodiments.

Example 1

Glucose was prepared into a 3 wt % aqueous solution as a hydrothermal reaction solution. 100 g of carbon fibers were added to a 0.5-liter stainless steel autoclave, and a hydrothermal reaction solution was added to submerge the carbon fibers. The reaction kettle was sealed, the pressure was 0.6MPa, the temperature was raised to 180°C, and the temperature was kept for 6 hours. Cool to room temperature and wash five times with plenty of deionized water. Put the hydrothermal carbon fiber into a tray, put it into a vacuum oven, and vacuum dry it at 50°C for 12 hours to obtain a high-efficiency carbon fiber photothermal conversion material covered with a hydrothermal carbon layer. The SEM image of the carbon fiber is shown in Figure 2a, and the SEM image of the carbon fiber covered with the hydrothermal carbon layer is shown in Figure 2b. The surface roughness of the hydrothermal carbon layer is 40 nm and the specific surface area is 5 m ² /g.

The prepared high-efficiency carbon fiber photothermal conversion material was prepared into a photothermal conversion film, which was assembled into a photothermal conversion device, and a dimethylacetamide (DMAc) solution containing 1000 ppm Sudan III was purified and recovered. The evaporation rate of DMAc solvent is as high as 0.98Kg m ^-2 h ^-1 , the recovered DMAc content is as high as 99.99%, and the photothermal conversion efficiency is as high as 93%. Fig. 3 is the dye concentration (ultraviolet absorption spectrum) before and after evaporation of the dyeing solvent in the high-efficiency carbon fiber photothermal conversion device in this embodiment. When the prepared high-efficiency carbon fiber photothermal conversion material covered with a hydrothermal carbon layer is immersed in a DMAc solvent for a long time, the carbon fiber remains unchanged and maintains strong mechanical properties and high photothermal conversion efficiency.

Example 2

A high-efficiency carbon fiber photothermal conversion material covered with a hydrothermal carbon layer was prepared according to the method of Example 1, and then the prepared high-efficiency carbon fiber photothermal conversion material was prepared into a photothermal conversion film, which was assembled into a photothermal conversion device (as shown in Figure 4). ), and purified and recovered the oil-water emulsion with an oil content of 10,000 ppm. After testing, the evaporation rate of the solvent is as high as 1.25Kg m ^-2 h ^-1 , which is 6 times the natural evaporation rate (0.2Kg m ^-2 h ^-1 ), the oil content in the purified and recovered water is reduced to 11.9ppm, and the photothermal conversion efficiency is as high as 94%.

Example 3

Sucrose was formulated into a 2 wt% aqueous solution as a hydrothermal reaction. 100 g of carbon fibers were added to a 0.5-liter stainless steel autoclave, and a hydrothermal reaction solution was added to submerge the carbon fibers. The reaction kettle was sealed, the pressure was 0.8 MPa, the temperature was raised to 150 °C, and the temperature was maintained for 10 hours. Cool to room temperature and wash five times with plenty of deionized water. Put the hydrothermal carbon fiber into the tray, put it in a vacuum oven, and vacuum dry it at 50 °C for 12 hours to obtain a high-efficiency carbon fiber photothermal conversion material covered by a hydrothermal carbon layer. The surface roughness of the hydrothermal carbon layer is 35nm and the specific surface area is ^4m2 /g.

The prepared high-efficiency carbon fiber photothermal conversion material is prepared into a photothermal conversion film, which is assembled into a photothermal conversion device and used for seawater desalination with a concentration of 3.5 wt%. After testing, the evaporation rate of water is as high as 1.47Kg m ^-2 h ^-1 , and the photothermal conversion efficiency is as high as 92.5%.

Example 4

The carboxymethyl cellulose was prepared into a 0.01 wt % aqueous solution as a hydrothermal reaction solution. 100 g of carbon fibers were added to a 0.5-liter stainless steel autoclave, and a hydrothermal reaction solution was added to submerge the carbon fibers. The reaction kettle was sealed, the pressure was 5MPa, the temperature was raised to 300°C, and the temperature was kept for 20 hours. Cool to room temperature and wash five times with plenty of deionized water. Put the hydrothermal carbon fiber into the tray, put it in a vacuum oven, and vacuum dry it at 50 °C for 12 hours to obtain a high-efficiency carbon fiber photothermal conversion material covered by a hydrothermal carbon layer. The surface roughness of the hydrothermal carbon layer is 80nm, and the specific surface area is 5m ² /g.

The prepared high-efficiency carbon fiber photothermal conversion material is prepared into a photothermal conversion film, which is assembled into a photothermal conversion device to process a high-concentration Dead Sea water system, where the concentrations of Na ⁺ , K ⁺ , Mg ²⁺ , and Ca ²⁺ are 29198 , 936, 2520, 898mg/L, Na ⁺ , K ⁺ , Mg ²⁺ , Ca ²⁺ concentrations were 9, 0.56, 0.26, 2.03mg/L after evaporation, reaching the standard of direct drinking water, and the outdoor water production rate was as high as 5.4Lm ^-2 day ^-1 , the photothermal conversion efficiency is as high as 93%.

Example 5

The fructose was prepared into a 10wt% aqueous solution as a hydrothermal reaction solution. 100 g of carbon fibers were added to a 0.5-liter stainless steel autoclave, and a hydrothermal reaction solution was added to submerge the carbon fibers. The reaction kettle was sealed, the pressure was 1.5MPa, the temperature was raised to 200°C, and the temperature was kept for 24 hours. Cool to room temperature and wash five times with plenty of deionized water. Put the hydrothermal carbon fiber into the tray, put it in a vacuum oven, and vacuum dry it at 50 °C for 12 hours to obtain a high-efficiency carbon fiber photothermal conversion material covered by a hydrothermal carbon layer. The surface roughness of the hydrothermal carbon layer is 100nm, and the specific surface area is 5m ² /g.

The prepared high-efficiency carbon fiber photothermal conversion material was prepared into a photothermal conversion film, which was assembled into a photothermal conversion device, and the dimethylformamide DMF solution containing 1000 ppm Sudan III was purified and recovered. The evaporation rate is as high as 0.99Kg m ^-2 h ^-1 , the recovered DMF content is as high as 99.99%, and the photothermal conversion efficiency is as high as 94%. When the prepared high-efficiency carbon fiber covered by the hydrothermal carbon layer is soaked in DMF solvent for a long time, the carbon fiber remains unchanged and maintains strong mechanical properties and high photothermal conversion efficiency.

Example 6

The maltose was prepared into a 3 wt % aqueous solution as a hydrothermal reaction solution. 100 g of carbon fibers were added to a 0.5-liter stainless steel autoclave, and a hydrothermal reaction solution was added to submerge the carbon fibers. The reaction kettle was sealed, the pressure was 2MPa, the temperature was raised to 250°C, and the temperature was kept for 1 hour. Cool to room temperature and wash five times with plenty of deionized water. Put the hydrothermal carbon fiber into the tray, put it in a vacuum oven, and vacuum dry it at 50°C for 12 hours to obtain a high-efficiency carbon fiber photothermal conversion material covered by a hydrothermal carbon layer. The surface roughness of the hydrothermal carbon layer is 30nm and the specific surface area is 1m ² /g.

The prepared high-efficiency carbon fiber photothermal conversion material is prepared into a photothermal conversion film, which is assembled into a photothermal conversion device, and an oil-water emulsion with an oil content of 10,000 ppm is purified and recovered. After testing, the evaporation rate of the solvent is as high as 1.26Kg m ^-2 h ^-1 , which is 6 times the natural evaporation rate (0.2Kg m ^-2 h ^-1 ), the oil content in the purified and recovered water is reduced to 10ppm, and the photothermal conversion efficiency is as high as 93 %.

In addition, the inventors of the present application also carried out corresponding experiments by using other raw materials and other process conditions listed above to replace the various raw materials and corresponding process conditions in Examples 1-6. The obtained high-efficiency carbon fiber photothermal conversion materials and carbon fiber light The purification and recovery effect of the thermal conversion device on the multi-media solvent is also ideal, which is basically similar to that of the products in Examples 1-6.

It should be noted that the specific embodiments of the present invention described above do not limit the protection scope of the present invention. Any other corresponding changes and modifications made according to the technical concept of the present invention shall be included in the protection scope of the claims of the present invention.

Claims (10)

1. A preparation method of a carbon fiber photothermal conversion material is characterized by comprising the following steps: carrying out hydrothermal reaction on a hydrothermal reaction solution containing carbon fibers and 0.01-10 wt% of a carbon source for 1-24 hours at the temperature of 150-300 ℃ and the pressure of 0.6-5 MPa, so as to generate a continuous hydrothermal carbon layer on the surfaces of the carbon fibers in situ; preferably, the carbon source includes any one or a combination of two or more of a water-soluble saccharide substance, a water-soluble polysaccharide substance, and a readily hydrolyzable polysaccharide substance.

2. The carbon fiber photothermal conversion material is characterized by comprising carbon fibers, wherein continuous hydrothermal carbon layers are grown on the surfaces of the carbon fibers in situ; preferably, the functional group contained in the surface of the hydrothermal carbon layer includes one or a combination of two or more of carbonyl, quinonyl and hydroxyl, the surface roughness of the hydrothermal carbon layer is 5 to 100nm, and the specific surface area of the hydrothermal carbon layer is 1 to 5m²/g。

3. Use of the carbon fiber photothermal conversion material prepared by the method of claim 1 or the carbon fiber photothermal conversion material of claim 2 for purification and recovery of a multi-media solvent system.

4. Use according to claim 3, characterized in that it comprises: the multi-medium solvent system is contacted with the carbon fiber photothermal conversion material, and the carbon fiber photothermal conversion material is irradiated by set light rays, so that the carbon fiber photothermal conversion material is subjected to photothermal conversion and generates heat energy, at least part of the solvent in the multi-medium solvent system is promoted to be heated and evaporated, and the purification and recovery of the multi-medium solvent system are realized.

5. Use according to claim 4, characterized in that: the set light is sunlight; and/or, the multimedia solvent system comprises a combination of at least one volatile solvent with at least one non-volatile or poorly volatile substance solute or a combination of two or more solvents of different volatility; and/or the carbon fiber photothermal conversion material is woven into a film shape.

6. Use according to claim 4 or 5, characterized in that: the solvent in the multi-medium solvent system comprises water and/or an organic solvent.

7. A carbon fiber photothermal conversion device characterized by comprising the carbon fiber photothermal conversion material produced by the method of claim 1 or the carbon fiber photothermal conversion material of claim 2.

8. The carbon fiber photothermal conversion device according to claim 7, comprising a photothermal conversion film woven from the carbon fiber photothermal conversion material, a liquid container, and a condensation recovery unit, wherein at least a partial region of the photothermal conversion film floats on a liquid surface of the multimedia solvent system when the liquid container contains the multimedia solvent system, and the carbon fiber photothermal conversion material can perform photothermal conversion to cause at least a part of the solvent in the multimedia solvent system to be thermally evaporated when the carbon fiber photothermal conversion material is irradiated with a predetermined light, and the condensation recovery unit is configured to condense and recover the evaporated at least a part of the solvent.

9. The carbon fiber photothermal conversion device according to claim 8, wherein: when the liquid container is filled with a multi-medium solvent system, a local area of the photo-thermal conversion film floats on the liquid level of the multi-medium solvent system, and the rest area is positioned below the liquid level of the multi-medium solvent system; and/or, the condensation recovery unit includes the condensation box and the condensation panel that the slope set up, the uncovered end department on condensation box upper portion of condensation panel lock, liquid container arranges in the condensation box, just still be provided with the condensate export on the condensation box.

10. The carbon fiber photothermal conversion device according to claim 9, wherein: the inclination angle of the condensation panel is 20-80 degrees; and/or at least partial areas of the photo-thermal conversion film are combined on the upper part of floating body materials to form a double-layer structure, and the density of the floating body materials is less than that of the multi-medium solvent system.

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