Tree bionic woven fiber skeleton for evaporation and desalination and its preparation method and application

Abstract

The present invention discloses a tree bionic woven fiber skeleton for evaporation and desalination, and a preparation method and application thereof. The tree bionic woven fiber skeleton is formed by mixing and weaving carbon fibers and polypyrrole-modified Tencel yarns. The tree bionic woven fiber skeleton proposed in the present invention uses polypyrrole-modified Tencel yarns to supply water, and uses an in-situ polymerization method to modify polypyrrole particles on the surface of the Tencel yarns, which has a certain light absorption capacity to enhance its photothermal conversion capacity. The carbon fibers absorb sunlight, generate heat and evaporate water, and the stability of the skeleton is enhanced by high-speed weaving, which solves the problem that the desalination efficiency of the previous evaporation device is reduced due to the generation of a large amount of salt scale on the surface due to desalination, and improves the problem that the photothermal evaporator cannot be mass-produced, and has a broad application prospect.

Description

Technical Field

[0001] The invention relates to the technical field of textile processing and seawater desalination, in particular to a tree bionic woven fiber skeleton for evaporation and desalination and a preparation method and application thereof. Background Art

[0002] The shortage of fresh water resources is increasingly attracting people's attention. Traditional methods to alleviate water shortages include membrane distillation and reverse osmosis, but they consume a lot of electricity or fuel in actual use, resulting in carbon emissions. A solar evaporator is a device that uses solar energy to evaporate water. It can use the radiant heat of solar energy to vaporize the liquid on the water surface and then condense it into water droplets, thereby removing solutes and improving the purity of water. Solar evaporation devices have high energy efficiency, high equipment flexibility, and can output clean water, so they have attracted much attention. In all solar evaporation devices, broadband solar energy, sufficient water supply, and appropriate thermal management design can improve their photothermal evaporation efficiency. However, the durability of solar evaporation devices will be affected by salt scaling, which will not only seriously affect the solar absorption efficiency, but also inevitably block the water supply channel. 3D evaporators with high evaporation rates are prone to salt accumulation and salt scaling, especially in high-solubility brine. Blocked water supply channels will limit the phase change and vapor diffusion of water, resulting in a decrease in evaporation efficiency during long-term desalination. Summary of the invention

[0003] The purpose of the present invention is to address the above-mentioned deficiencies in the prior art and propose a tree-inspired woven fiber skeleton for evaporation and desalination, as well as a preparation method and application thereof. The skeleton has excellent photothermal evaporation and high-efficiency desalination capabilities, and solves the problem of decreased photothermal efficiency of 3D photothermal evaporation devices due to salt accumulation in seawater desalination.

[0004] The tree bionic woven fiber skeleton for evaporation and desalination of the present invention is formed by mixing and weaving carbon fibers and polypyrrole-modified Tencel yarns.

[0005] Furthermore, the tree bionic woven fiber skeleton is woven from a plurality of carbon fiber / Tencel composite woven yarns, the carbon fiber / Tencel composite woven yarns are composed of a carbon fiber braided body rotated and interlaced around a polypyrrole-modified Tencel yarn, and the carbon fiber braided body is formed by interweaving a plurality of carbon fibers.

[0006] Furthermore, in the carbon fiber / Tencel composite braided yarn, the number of the polypyrrole-modified Tencel yarns is 4-40, and the number of the carbon fibers is 8-16.

[0007] Furthermore, the preparation method of the polypyrrole-modified Tencel yarn is as follows: the Tencel yarn is first soaked in a sodium dodecylbenzene sulfate solution for a period of time, and then soaked in a ferric chloride solution for a period of time, and then a certain amount of polypyrrole is added to the ferric chloride solution in which the Tencel yarn is soaked, and after sufficient stirring for the reaction, the Tencel yarn is taken out and dried to obtain the polypyrrole-modified Tencel yarn.

[0008] Furthermore, the concentration of the sodium dodecylbenzene sulfate solution is 0.005-0.02 g / ml; the concentration of the ferric chloride solution is 0.026-0.06 g / ml; and the mass ratio of the polypyrrole to the ferric chloride is 1-3:4-6.

[0009] Furthermore, the Tencel yarn is dried at 100-120° C. for 30-45 minutes; the Tencel yarn is first soaked in a sodium dodecylbenzene sulfate solution for 5-10 minutes, and then soaked in a ferric chloride solution for 5-10 minutes.

[0010] A method for preparing the tree bionic woven fiber skeleton for evaporative desalination as described above comprises the following steps:

[0011] S1, pretreating the original Tencel yarn with polypyrrole by an in-situ polymerization method to obtain the Tencel yarn modified with polypyrrole;

[0012] S2, winding the carbon fiber on the yarn shaft through a winding machine, and then fixing the yarn shaft on the yarn disk of the high-speed braiding machine, the polypyrrole-modified Tencel yarn is wound on the constant spool, and sent to the axis of the high-speed braiding machine through a pre-tightening device; multiple carbon fibers are interwoven to form a braided body, and the braided body is interlaced and wound on the polypyrrole-modified Tencel yarn as the disk rotates to form a carbon fiber / Tencel composite braided yarn;

[0013] S3, a part of the carbon fiber / Tencel composite braiding yarn is wound on a yarn shaft through a winding machine and fixed on a yarn disk of a high-speed braiding machine. At the same time, another part of the carbon fiber / Tencel composite braiding yarn is wound on multiple constant spools and fed into the axis of the high-speed braiding machine through a pre-tightening device; a tree bionic braided fiber skeleton is obtained by weaving with a high-speed braiding machine. Furthermore, in step S2, the yarn is continuously supplied by rotating the yarn shaft, and the number of yarn shafts required for winding the yarn depends on the number of yarn feeding shafts, the number of yarn feeding shafts is 8-16, and the number of constant spools is 4-40. By changing the number ratio of the yarn feeding shafts and the constant spools, carbon fiber / Tencel composite braided yarns of different specifications are obtained; the high-speed braiding machine operates at a braiding speed of 5-25r / min, a winding speed of 0.5-5m / min, and a braiding spacing of 60-120mm; the reciprocating motion from one disc to another is conducive to the carbon fiber bundle tightly wrapping the polypyrrole-modified Tencel yarn; in step S2, the carbon fiber is wound on the yarn shaft by a winding machine, wherein the number of carbon fiber winding turns is 3000-5000 turns; in step S3, a portion of the carbon fiber / Tencel composite braided yarn is wound on the yarn shaft by a winding machine, wherein the number of winding turns is 500-1000 turns.

[0014] Furthermore, the number of carbon fiber / Tencel composite braiding yarns in the tree bionic braided fiber skeleton is 12-56.

[0015] A solar high-efficiency desalination photothermal evaporator comprises a transparent box body, wherein a salt water pool and a fresh water pool are arranged inside the transparent box body, an inclined box cover is arranged on the top of the transparent box body, and the box cover is inclined downward from the salt water pool to the top of the fresh water pool, and a plurality of tree bionic woven fiber skeletons for evaporation and desalination are inserted on the salt water pool.

[0016] The tree bionic woven fiber skeleton proposed in the present invention utilizes polypyrrole-modified Tencel yarn to supply water, and adopts in-situ polymerization to modify polypyrrole particles on the surface of the Tencel yarn, which has a certain light absorption capacity to enhance its photothermal conversion capacity. The carbon fiber absorbs sunlight, generates heat and evaporates water, and the stability of the skeleton is enhanced by high-speed weaving, which solves the problem that the desalination efficiency of the previous evaporation device is reduced due to the generation of a large amount of salt scale on the surface due to desalination, and improves the problem that the photothermal evaporator cannot be mass-produced, and has a very broad application prospect.

[0017] In order to achieve the controllability of the tree bionic woven fiber skeleton, the existing mature weaving integration technology was adopted, and the weaving speed and weaving spacing were adjusted to change the density of the tree bionic woven skeleton, or the number and distribution of the composite weaving yarns were adjusted to change the shape of the tree bionic woven skeleton. While reducing the manufacturing cost, the stability and reliability of the tree bionic woven fiber skeleton were further improved, so that it has better photothermal efficiency and water supply rate, thereby realizing the optimal design and manufacturing of the fiber skeleton.

[0018] The preparation method of the tree bionic woven fiber skeleton proposed by the present invention firstly weaves carbon fiber and polypyrrole-modified Tencel to form a carbon fiber / Tencel composite woven yarn before weaving the tree bionic woven fiber skeleton. The number of carbon fiber roots determines the light utilization efficiency of the tree bionic woven fiber skeleton, and the number of polypyrrole-modified Tencel yarns determines the water supply rate of the tree bionic woven fiber skeleton. The thickness of the composite yarn is adjusted by adjusting the number of carbon fiber and polypyrrole-modified Tencel yarns, and then the number of carbon fiber / Tencel composite woven yarns is adjusted to achieve a balance between the photothermal efficiency and the water supply rate of the tree bionic woven fiber skeleton.

[0019] The present invention is inspired by the ecological structure of natural trees (roots, trunks, leaves), uses carbon fiber and polypyrrole-modified Tencel yarn as raw materials, and adopts adjustable weaving technology to prepare a tree bionic woven fiber skeleton. At the same time, by adjusting the external morphology and illumination area of ​​the bionic woven fiber skeleton, the tree morphology with thick trunks and lush leaves is simulated, and the equilibrium state of salt water diffusion and energy utilization is achieved to achieve efficient desalination in long-term operation. Considering the salt scale problem caused by the imbalance of water supply and steam evaporation rate, a reasonable design scheme of the bionic woven fiber skeleton is proposed to achieve stable desalination performance. The bionic woven fiber skeleton has excellent durable use performance, and can still use solar energy to achieve stable and efficient desalination after running in salt water for multiple cycles. In the actual application environment, the desalination and purification performance of the system is competitive, and the daily water production is sufficient and considerable. This bionic evaporator balances the efficiency and practicality of photothermal evaporation, providing a feasible way for solar desalination.

[0020] After bionic simulation and regulation, the evaporation and desalination efficiency of brine were high under 1 sun. After three days of high-concentration salt water testing, the tree bionic woven fiber skeleton remained intact, and there was no salt particle deposition or blockage due to the porous fiber structure. In addition, the outdoor seawater desalination and purification performance was also very impressive with the daily water collection rate. In short, the stable and effective tree bionic woven fiber skeleton makes it possible to provide a potential green desalination method. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1The present invention discloses a tree bionic woven fiber skeleton for evaporation and desalination, wherein: 1-carbon fiber, 2-tencel yarn modified with polypyrrole, 3-carbon fiber / tencel composite woven yarn, 4-tree bionic woven fiber skeleton;

[0022] Figure 2 A physical picture of a tree bionic woven fiber skeleton for evaporative desalination woven with carbon fiber / Tencel composite woven yarns with different numbers of roots;

[0023] Figure 3a-3c The comparison of water supply flux, water quality change and evaporation temperature of tree bionic woven fiber skeletons for evaporation desalination woven with different numbers of carbon fiber / Tencel composite woven yarns;

[0024] Figure 4a-4b The water supply flux and desalination performance of the tree-inspired woven fiber skeleton for evaporative desalination woven from different numbers of polypyrrole-modified Tencel yarns and the same number of carbon fiber woven yarns in 15wt% NaCl solution for 8h;

[0025] Figure 5a This is a schematic diagram of the structure of a solar-powered high-efficiency desalination photothermal evaporator;

[0026] Figure 5b A physical picture of a solar energy efficient desalination thermal evaporator that can be implemented;

[0027] Figure 5c Comparison of ion concentrations before and after desalination.

[0028] 1-transparent box; 2-salt water pool; 3-fresh water pool; 4-box cover; 5-tree bionic woven fiber skeleton. DETAILED DESCRIPTION

[0029] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0030] Figure 1 The figure is a schematic diagram of the manufacturing of the bionic composite fiber skeleton. The original Tencel yarn is pretreated with polypyrrole by in-situ polymerization to obtain a carbon fiber / Tencel composite braided yarn with strong sunlight absorption performance. The Tencel yarn is used as the core yarn for water supply, and the carbon fiber is wrapped around it to absorb the incident sunlight and convert it into heat energy. The specific operation steps are as follows:

[0031] 20 Tencel yarns were placed in a solution of 2g sodium dodecylbenzene sulfate dissolved in 200ml deionized water, and taken out after soaking for 8 minutes. The soaked Tencel yarn was placed in a solution of 5.7g anhydrous ferric chloride dissolved in 100ml deionized water, and also soaked for 8 minutes. 3g polypyrrole was taken, poured into the ferric chloride solution in which the Tencel yarn was soaked, and after sufficient stirring and reaction, the Tencel yarn was placed in an electric heating blower and dried at 120°C for 45 minutes. The carbon fiber was wound on the yarn shaft by a winding machine, and the yarn shaft was fixed on the yarn disk of the high-speed braiding machine, wherein the number of winding turns was 3000. The Tencel yarn modified by polypyrrole was wound on a constant bobbin and fed into the axis of the high-speed braiding machine through a pre-tightening device. Multiple carbon fibers were interwoven to form a braided body shell, and the braided body was interlaced and wound on the Tencel yarn modified by polypyrrole as the disc rotated. The high-speed braiding machine runs at a braiding speed of 15r / min, a winding speed of 3m / min, and a braiding spacing of 80mm. The reciprocating motion from one disc to another is conducive to the carbon fiber bundle tightly wrapping the polypyrrole-modified Tencel yarn to form a carbon fiber / Tencel composite braided yarn.

[0032] Then, a part of the carbon fiber / tencel composite braided yarn is wound on a yarn shaft through a winding machine and fixed on the yarn disc of the high-speed braiding machine, wherein the number of winding turns is 1000. At the same time, another part of the carbon fiber / tencel composite braided yarn is wound on multiple constant bobbins and fed into the axis of the high-speed braiding machine through a pre-tightening device.

[0033] The yarn is continuously supplied by the rotation of the yarn shaft, and the number of yarn shafts required for winding the yarn depends on the number of yarn feeding shafts. The number of yarn feeding shafts is 16, and the number of constant spools is 24. By changing the number ratio of yarn feeding shafts and constant spools, different specifications of carbon fiber / Tencel composite braided yarns can be obtained, thereby obtaining different specifications of tree bionic braided fiber skeletons. The total number of carbon fiber / Tencel composite braided yarns in the tree bionic braided fiber skeleton is 40. The photothermal evaporation efficiency of tree bionic braided fiber skeletons of different specifications is not the same.

[0034] Figure 2 This is a physical picture of the tree bionic woven fiber skeleton for evaporation desalination woven with carbon fiber / Tencel composite woven yarns with different numbers of roots.

[0035] When preparing carbon fiber / Tencel composite braided yarn, 16 yarn feeding shafts are used, that is, the number of carbon fiber bundles is 16, and the number of polypyrrole-modified Tencel yarns is 20, which are fixed on the bobbin and fed into the axis of the high-speed braiding machine through a pre-tightening device. 16 yarn feeding shafts are also used to prepare tree bionic braided fiber skeletons. When the total number of carbon fiber / Tencel composite braided yarns in the tree bionic braided fiber skeleton is set to 16, 24, 32, 40, 48, and 56, the corresponding tree bionic braided fiber skeletons are marked as B16, B24, B32, B40, B48, and B56.

[0036] Figure 3a-3c The comparison of water supply flux, water quality change, and evaporation temperature of tree bionic woven fiber skeletons for evaporative desalination woven with different numbers of carbon fiber / Tencel composite woven yarns is shown. The diameter of the tree bionic woven fiber skeleton increases with the increase of carbon fiber / Tencel composite woven yarns, and its water supply also gradually increases, and the water supply of B56 is almost twice that of B16. However, the illumination / evaporation area is determined by the unique structure and elastic modulus of carbon fiber / Tencel composite woven yarns. Due to the change in carbon fiber density, there are differences in the continuous absorption of sunlight in different illumination areas. The illumination / evaporation area reaches the limit at B40, which is about 1.8 times higher than B16. With the increase of the projected area, the solar energy absorption and photothermal conversion performance continue to improve. The difference in solar energy absorption performance of the tree bionic woven fiber skeleton in the spectral range of 200-2500nm is almost negligible, and its excellent optical performance is attributed to the synergistic effect of the three-dimensional pore network structure of Tencel and the tightly wrapped structure of carbon fiber, which proves that the photothermal performance of the tree bionic woven fiber skeleton is mainly attributed to the characteristics of the structure rather than the material itself. As the number of carbon fibers increases, multiple solar energy absorption is achieved in the macrostructure, which means stronger light-to-heat conversion and higher surface temperature. However, when the heat generated reaches its maximum, the excess water supply leads to a decrease in the surface temperature. The evaporation rates of B16, B24, B32, B40, B48, and B56 are 3.16, 3.39, 3.83, 4.58, 4.39, and 4.25 kg·m, respectively. -2 ·h -1 Among them, B40 exhibits the best evaporation performance due to its balanced light-heat conversion and water supply rate.

[0037] picture Figure 4a-4b The water supply flux of the tree-inspired woven fiber skeleton for evaporative desalination woven from different numbers of polypyrrole-modified Tencel yarns and the same number of carbon fiber woven yarns, as well as the desalination performance after running in 15wt% NaCl solution for 8h.

[0038] When the number of silk yarns changes from 10 to 40, the corresponding water flow rates are 4.98, 6.13, 7.82, and 9.99 kg·m -2 The gradient increase of water supply flux is mainly due to the following two reasons: on the one hand, as the number of Tencel yarns increases, the number of hydrophilic groups contained in the core layer also increases accordingly; on the other hand, inspired by the porous structure of trees, as the number of Tencel yarns increases, more microchannels are formed inside the woven core yarn layer. The microchannels formed by the interweaving of Tencel yarns enhance the capillary action, thereby improving its water supply capacity. Moreover, the greater the water supply flux, the greater the evaporation rate.

[0039] The microchannels of the tree-inspired woven fiber skeleton can be precisely tuned to improve the desalination rate and durability of the solar desalination process. The salt water diffusion and convection performance can be improved by adjusting the number of Tencel yarns to mitigate salt accumulation.

[0040] When the number of silk yarns is 10, 20, 30, and 40, the corresponding tree bionic woven fiber skeletons are labeled as C10, C20, C30, and C40. The evaporation rates of C10, C20, C30, and C40 are 3.05, 3.54, 4.58, and 4.22 kg·m, respectively. -2 ·h -1 For C10 and C20, the transported water was insufficient and the energy utilization was low. For C40, excess water was supplied to the evaporation interface, but the energy generated was insufficient to evaporate this water. Even in highly concentrated brine (15wt%), the evaporation rate remained above 70%. This proves that the desalination process does not destroy the tree bionic woven fiber skeleton structure or block the pores even in highly concentrated brine.

[0041] Figure 5a The schematic diagram of the structure of the solar energy efficient desalination photothermal evaporator of this embodiment is a solar energy efficient desalination photothermal evaporator, comprising a transparent box 1, a salt water pool 2 and a fresh water pool 3 are arranged in the transparent box, an inclined box cover 4 is arranged on the top of the transparent box 1, the box cover 4 is inclined downward from the salt water pool 2 to the top of the fresh water pool 3, and a plurality of tree bionic woven fiber skeletons 5 for evaporation and desalination are inserted on the salt water pool 2. The two ends of the inserted tree bionic woven fiber skeletons are cut and are in a scattered state.

[0042] Figure 5b This is a photo of the solar high-efficiency desalination photothermal evaporator of this embodiment. The transparent box is made of transparent acrylic glass. For practical applications, an outdoor experiment was conducted using an expandable 9-array tree bionic woven fiber skeleton. The selected projection area is about 300cm 2 The ultra-clear acrylic lid acts as a concentrator. The desalinated water flows by gravity along the lid to the freshwater pool for collection.

[0043] Figure 5c To compare the ion concentrations before and after desalination, the experiment was conducted using unpurified salt water from the Yellow Sea in Wuhan, China, changing the solar flux and temperature. 2+ Mg 2+ 、Na + and K + The corresponding concentration dropped significantly, far below the World Health Organization's drinking water ion concentration standard. The intensity of sunlight varies with the weather and the angle of solar incidence, so it is impossible to guarantee that the light intensity is always the same during the experiment. Even in this case, after running for 7 days (8 hours per day), the average water collection rate still reached 30L·m -2 After seven days of operation in high-concentration salt water, the tree bionic woven fiber skeleton remained intact without salt particle deposition or clogging. Outdoor tests have shown that the tree bionic woven fiber skeleton provides a potential path for stable and efficient seawater desalination and purification applications. In addition, it also has the ability to desalinate strong acid and alkaline sewage and organic dye wastewater.

[0044] In summary, the tree bionic woven fiber skeleton proposed in the present invention utilizes polypyrrole-modified Tencel yarn to supply water, and carbon fibers to absorb solar energy for evaporation. The stability of the skeleton is enhanced by high-speed weaving, which solves the problem that a large amount of salt scale is generated on the surface of the evaporation device due to desalination, resulting in a decrease in desalination efficiency. It also improves the problem that photothermal evaporation devices cannot be mass-produced, and has a broad application prospect.

[0045] For matters not mentioned above, the prior art applies.

[0046] Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art should understand that the above examples are for illustration only and are not intended to limit the scope of the present invention. Those skilled in the art to which the present invention belongs may make various modifications or supplements to the specific embodiments described or replace them in a similar manner, but they will not deviate from the direction of the present invention or exceed the scope defined by the attached claims. Those skilled in the art should understand that any modifications, equivalent substitutions, improvements, etc. made to the above embodiments based on the technical essence of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing a tree bionic woven fiber skeleton for evaporative desalination, characterized in that: The steps include: S1, pretreating the original Tencel yarn with polypyrrole by an in-situ polymerization method to obtain the Tencel yarn modified with polypyrrole; S2, winding the carbon fiber on the yarn shaft through a winding machine, and then fixing the yarn shaft on the yarn disk of the high-speed braiding machine, the polypyrrole-modified Tencel yarn is wound on the constant spool, and sent to the axis of the high-speed braiding machine through a pre-tightening device; multiple carbon fibers are interwoven to form a braided body, and the braided body is interlaced and wound on the polypyrrole-modified Tencel yarn as the disk rotates to form a carbon fiber / Tencel composite braided yarn; S3, a part of the carbon fiber / Tencel composite braiding yarn is wound on a yarn shaft through a winding machine and fixed on a yarn disk of a high-speed braiding machine. At the same time, another part of the carbon fiber / Tencel composite braiding yarn is wound on multiple constant spools and fed into the axis of the high-speed braiding machine through a pre-tightening device; a tree bionic braided fiber skeleton is obtained by weaving with a high-speed braiding machine.

2. The preparation method according to claim 1, characterized in that: In step S2, the yarn is continuously supplied by rotating the yarn shaft, and the number of yarn shafts required for winding the yarn depends on the number of yarn feeding shafts, the number of yarn feeding shafts is 8-16, and the number of constant spools is 4-40. By changing the number ratio of the yarn feeding shafts and the constant spools, carbon fiber / Tencel composite braided yarns of different specifications are obtained; the high-speed braiding machine operates at a braiding speed of 5-25r / min, a winding speed of 0.5-5m / min, and a braiding spacing of 60-120mm; the reciprocating motion from one disc to another is conducive to the carbon fiber bundle tightly wrapping the polypyrrole-modified Tencel yarn; in step S2, the carbon fiber is wound on the yarn shaft by a winding machine, wherein the number of carbon fiber winding turns is 3000-5000 turns; in step S3, a part of the carbon fiber / Tencel composite braided yarn is wound on the yarn shaft by a winding machine, wherein the number of winding turns is 500-1000 turns.

3. The preparation method according to claim 1, characterized in that: The number of carbon fiber / Tencel composite braiding yarns in the tree bionic braided fiber skeleton is 12-56.

4. A tree bionic woven fiber skeleton for evaporation and desalination prepared by the preparation method according to any one of claims 1 to 3, characterized in that: It is made of a mixed weaving of carbon fiber and polypyrrole-modified Tencel yarn.

5. The tree bionic woven fiber skeleton for evaporation and desalination as claimed in claim 4, characterized in that: The tree bionic woven fiber skeleton is woven from a plurality of carbon fiber / Tencel composite woven yarns, the carbon fiber / Tencel composite woven yarns are composed of a carbon fiber braided body rotating and interlaced around a polypyrrole-modified Tencel yarn, and the carbon fiber braided body is formed by interweaving a plurality of carbon fibers.

6. The tree bionic woven fiber skeleton for evaporation and desalination as claimed in claim 4, characterized in that: In the carbon fiber / tencel composite braided yarn, the number of polypyrrole-modified tencel yarns is 4-40, and the number of carbon fibers is 8-16.

7. The tree bionic woven fiber skeleton for evaporation and desalination as claimed in claim 4, characterized in that: The preparation method of polypyrrole-modified Tencel yarn is as follows: the Tencel yarn is first soaked in a sodium dodecylbenzene sulfate solution for a period of time, and then soaked in a ferric chloride solution for a period of time, and then a certain amount of polypyrrole is added to the ferric chloride solution in which the Tencel yarn is soaked, and after sufficient stirring for reaction, the Tencel yarn is taken out and dried to obtain the polypyrrole-modified Tencel yarn.

8. The tree bionic woven fiber skeleton for evaporation and desalination as claimed in claim 7, characterized in that: The concentration of the sodium dodecylbenzene sulfate solution is 0.005-0.02 g / ml; the concentration of the ferric chloride solution is 0.026-0.06 g / ml; and the mass ratio of the polypyrrole to the ferric chloride is 1-3:4-6.

9. The tree bionic woven fiber skeleton for evaporation and desalination as claimed in claim 7, characterized in that: The Tencel yarn is dried at 100-120° C. for 30-45 minutes; the Tencel yarn is first soaked in a sodium dodecylbenzene sulfate solution for 5-10 minutes, and then soaked in a ferric chloride solution for 5-10 minutes.

10. A solar high-efficiency desalination photothermal evaporator, characterized by: It comprises a transparent box body, wherein a salt water pool and a fresh water pool are arranged inside the transparent box body, an inclined box cover is arranged on the top of the transparent box body, and the box cover is inclined downward from the salt water pool to the top of the fresh water pool, and a plurality of tree bionic woven fiber skeletons for evaporation and desalination as claimed in any one of claims 4 to 9 are inserted on the salt water pool.

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