A sewing textile capable of efficiently desalting, and its preparation method and application

Abstract

The present invention provides a sewing textile capable of efficient desalination, and its preparation method and application. The preparation method of the sewing textile capable of efficient desalination of the present invention comprises the following steps: twisting a plurality of hydrophilic fibers to obtain hydrophilic yarn; sequentially immersing the hydrophilic yarn in a cleaning agent and a passivation solution, and obtaining a hydrophilic twisted yarn after drying; immersing the hydrophilic twisted yarn in a carbon-based material solution for modification, and obtaining a hydrophilic twisted modified yarn after drying; winding the hydrophilic twisted modified yarn on an electric wire to obtain a photo-electro-thermal yarn; modifying a hydrophilic fabric using a carbon-based material solution to obtain a hydrophilic modified fabric; sewing the photo-electro-thermal yarn onto the hydrophilic modified fabric to obtain a sewing textile capable of efficient desalination. The sewing textile capable of efficient desalination of the present invention has the properties of photo-thermal conversion, water flow supply, and optimized evaporation rate.

Description

Technical Field

[0001] The present invention relates to the technical field of energy utilization, in particular to a sewing textile capable of efficiently desalting, a preparation method thereof and an application thereof. Background Art

[0002] The global water crisis has become a huge threat to people's daily lives and social development. Solar steam generation is considered a green and promising technology for brine desalination and waste purification. Many strategies, such as material modification and structural engineering, have been applied to enhance performance. Structural engineering for ambient heat collection, wind energy utilization, and all-round solar absorption can accelerate evaporation more than material modification. Traditional methods for seawater desalination include membrane distillation, reverse osmosis, electrodialysis, etc., but their huge energy consumption and cumbersome equipment limit their application. In recent years, the application of environmentally friendly, efficient, and simple interfacial photothermal water evaporation technology in seawater desalination has become a hot topic, and the use of photothermal-driven power generation has also received widespread attention. However, the strong dependence of common structural engineering strategies on ambient energy supply (such as solar energy, heat, and wind) limits the acceleration of evaporation. Specifically, weather changes and day and night alternations have a huge impact on operational efficiency and continuity.

[0003] Therefore, it is necessary and meaningful to study solar steam generator (ESSG) systems. Common ESSG systems are constructed by connecting heat dissipation devices (such as solar cells and solar panels) or heat dissipation components (such as electric panels, sheets, wires). However, most ESSG research only focuses on integrating electrothermal to assist light-to-heat conversion, but lacks exploration of optimizing electrothermal conversion efficiency. In addition, scalable equipment is crucial for practical ESSG. Insufficient power supply and huge losses have become important obstacles to large-scale ESSG. Fiber materials with different properties (including hydrophilicity, flexibility, processability and portability) show excellent potential for the manufacture of ESSG systems. Mature, convenient and streamlined textile processing technology provides conditions for the construction of practical large-scale ESSG.

[0004] Prior art discloses the preparation and application of a generator set that combines power generation with desalination. This approach combines the generator set with desalination equipment, housing both the internal combustion generator and the desalination module within a shipping container. The desalination module utilizes the waste heat from the power generation module to promote seawater evaporation. However, this achievement lacks salt rejection performance, suffers from poor stability over long-term operation, and the system structure is overly complex, resulting in high costs.

[0005] Prior art also discloses the preparation and application of a solar-powered water cogeneration device. This device utilizes heat absorption during water phase change to lower the operating temperature of photovoltaic cells and uses waste heat to distill seawater for desalination. Multi-stage evaporation technology fully utilizes both the sensible heat of steam and the latent heat of condensation. A membrane distillation system can increase freshwater production. However, the complex manufacturing process, the difficulty in efficient mass production, and the high cost limit its industrial application.

[0006] Based on the defects of the above-mentioned seawater desalination device, it is necessary to improve it. Summary of the Invention

[0007] In light of this, the present invention addresses the shortcomings of existing technologies and proposes a highly efficient desalination sewing textile, its preparation method, and its application. Hydrophilic fibers serve as the base material and framework for functionalized loading. The hydrophilic fibers are twisted and loaded with a carbon-based material. The carbon-based material serves as both a photothermal conversion material and a power generation material, effectively collecting charge, which is crucial for water circulation and ion migration. The sewing textile of the present invention exhibits properties such as photothermal conversion, water flow, and optimized evaporation rate.

[0008] The present invention is achieved through the following technical solutions:

[0009] In a first aspect, the present invention provides a method for preparing a sewing textile capable of efficient desalination, comprising the following steps:

[0010] Twisting several strands of hydrophilic fibers to obtain hydrophilic yarn;

[0011] The hydrophilic yarn is sequentially immersed in a cleaning agent and a passivation solution, and dried to obtain a hydrophilic twisted yarn;

[0012] The hydrophilic twisted yarn is immersed in a carbon-based material solution for modification, and then dried to obtain the hydrophilic twisted modified yarn;

[0013] Winding the hydrophilic twisted modified yarn on an electric wire to obtain a photo-electrothermal yarn;

[0014] Using a carbon-based material solution to modify the hydrophilic fabric to obtain a hydrophilic modified fabric;

[0015] The photo-electrothermal yarn is sewn onto the hydrophilic modified fabric to obtain a sewn textile capable of desalination with high efficiency.

[0016] Preferably, the hydrophilic fiber includes at least one of Tencel, cotton, acetate fiber, and wool;

[0017] And / or, in the steps of immersing the hydrophilic twisted yarn in a carbon-based material solution for modification and using the carbon-based material solution to modify the hydrophilic fabric, the carbon-based material includes at least one of single-walled carbon nanotubes, carbon black, dopamine hydrochloride, graphene oxide, and Mxene; and the hydrophilic fabric includes at least one of Tencel, cotton, acetate fiber, and wool.

[0018] Preferably, in the step of twisting the plurality of hydrophilic fibers, the twist coefficient is 2T / cm to 6T / cm, the main shaft speed is 5000r / min to 6000r / min, and the number of hydrophilic fibers is 10 to 18 strands.

[0019] Preferably, the cleaning agent comprises a mixture of oxalic acid, sulfuric acid and water;

[0020] The concentration of oxalic acid in the cleaning agent is 20-30 wt %, and the concentration of sulfuric acid in the cleaning agent is 5-10 wt %.

[0021] Preferably, the passivation solution is a copper passivation solution.

[0022] Preferably, the carbon-based material solution comprises water and carbon-based material, and the concentration of the carbon-based material in the carbon-based material solution is 0.1 wt% to 0.25 wt%.

[0023] Preferably, the hydrophilic twisted modified yarn is wound around an electric wire using a fancy twisting machine to obtain a photo-electrothermal yarn, wherein the twist coefficient is 280T / m-300T / m, the rotation speed is 4000r / min-5000r / min, and the winding speed is 1.7m / min-2.2m / min.

[0024] Preferably, in the step of sewing the photo-electrothermal yarn onto the hydrophilic modified fabric, the sewing tension coefficient is 2-3, the stitch width is 0 mm-7 mm, the stitch length is 0 mm-5 mm, and the sewing speed is 800 r / min-850 r / min;

[0025] And / or, the length of the hydrophilic twisted modified yarn is 8.94 cm to 24.49 cm.

[0026] In a second aspect, the present invention further provides a sewing textile capable of efficient desalination, which is prepared by the preparation method.

[0027] In a third aspect, the present invention further provides a sewing textile capable of high-efficiency desalination prepared by the preparation method or the use of the sewing textile capable of high-efficiency desalination in hydrovoltaic power generation and seawater desalination.

[0028] The method for preparing the sewing textile capable of efficient desalination of the present invention has the following advantages over the prior art:

[0029] Beneficial effects:

[0030] The sewing textile prepared by the present invention is a sewing photo-electric heating yarn, the yarn is composed of a core layer of wires and a sheath layer of fibers modified by carbon-based materials; the sewing photo-electric heating textile is designed with a custom pattern on a cotton substrate using an automatic sewing machine. The sewing textile capable of efficient desalination of the present invention has the properties of photothermal conversion, water flow supply, and optimized evaporation rate. The evaporation efficiency is affected by the evaporation conversion rate, heat distribution and evaporation utilization rate. By controlling the sewing pattern, not only the heat conversion and heat distribution can be optimized, but also the evaporation utilization rate can be improved. Moderate DC input is manipulated to obtain the best evaporation utilization performance. At the same time, the carbon-based material provides sufficient photothermal input for interfacial evaporation. The hydrophilic substrate can achieve moderate water supply and continuous brine circulation, achieving efficient and long-lasting desalination. And most common impurity ions and dye pollutants can be removed during the seawater desalination process. This solution achieved 2.43 kg m under 2V DC input and 1 solar radiation. -2 ·h -1 Excellent evaporation rate. Stable and continuous desalination was achieved in 3.5 wt% brine with no salt accumulation after 24 hours of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0032] Figure 1 Finite element simulation analysis of sewing textiles of different lengths prepared in Examples 1 to 5;

[0033] Figure 2 The cloud diagram shows the sewing textiles of different lengths prepared in Examples 1 to 5;

[0034] Figure 3 The actual temperature performance of sewing textiles of different lengths prepared in Examples 1 to 5 on cotton fabrics;

[0035] Figure 4 This is the friction resistance test of SPE-4 prepared in Example 4;

[0036] Figure 5 is the electrothermal efficiency of SPE-4 prepared in Example 4 at different input voltages;

[0037] Figure 6is the evaporation efficiency of the SPE-4 prepared in Example 4 under different radiation conditions at a voltage input of 2 V;

[0038] Figure 7 The evaporation mass changes over time for 3.5 wt % brine using the SPE-4 prepared in Example 4 under 1 sun radiation and different voltage inputs;

[0039] Figure 8 The salt rejection rate of the SPE-4 prepared in Example 4 in a 3.5 wt% saline solution under different voltage input conditions;

[0040] Figure 9 The desalination process of the SPE-4 prepared in Example 4 in a brine solution with a concentration of 3.5 wt% is shown;

[0041] Figure 10 The SPE-4 prepared in Example 4 evaporates seawater outdoors under a 2V DC input, and the outdoor temperature changes and the collection rate of condensed water obtained by evaporating seawater;

[0042] Figure 11 The ion concentration changes of the SPE-4 prepared in Example 4 after all-day outdoor desalination. DETAILED DESCRIPTION

[0043] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0044] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0045] It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments. In addition, in the description of this application, the term "including" means "including but not limited to". Various embodiments of the present invention may be presented in the form of a range; it should be understood that the description in the form of a range is merely for convenience and brevity and should not be understood as a rigid limitation on the scope of the invention; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within the range. For example, the range description from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0046] The present invention provides a method for preparing a sewing textile capable of efficient desalination, comprising the following steps:

[0047] S1. twisting a plurality of hydrophilic fibers to obtain hydrophilic yarn;

[0048] S2, immersing the hydrophilic yarn in a cleaning agent and a passivation solution in sequence, and drying to obtain a hydrophilic twisted yarn;

[0049] S3, immersing the hydrophilic twisted yarn in a carbon-based material solution for modification, and drying to obtain the hydrophilic twisted modified yarn;

[0050] S4, winding the hydrophilic twisted modified yarn onto an electric wire to obtain a photo-electrothermal yarn;

[0051] S5. Modifying the hydrophilic fabric using a carbon-based material solution to obtain a hydrophilic modified fabric;

[0052] S6. Sewing the photo-electrothermal yarn onto the hydrophilic modified fabric to obtain a sewn textile capable of highly efficient desalination.

[0053] In some embodiments, the hydrophilic fiber includes at least one of tencel, cotton, acetate, and wool.

[0054] In some embodiments, in the steps of immersing the hydrophilic twisted yarn in a carbon-based material solution for modification and using the carbon-based material solution to modify the hydrophilic fabric, the carbon-based material includes at least one of single-walled carbon nanotubes, carbon black, dopamine hydrochloride, graphene oxide, and Mxene; and the hydrophilic fabric includes at least one of Tencel, cotton, acetate fiber, and wool.

[0055] In some embodiments, during the step of twisting the plurality of hydrophilic fiber strands, the twist coefficient is 2 T / cm to 6 T / cm, the spindle speed is 5000 r / min to 6000 r / min, and the number of hydrophilic fiber strands is 10 to 18. Through twisting, the hydrophilic fibers are tightly interwoven and entangled with each other, forming a hydrophilic twisted yarn having unique interfiber capillary channels.

[0056] In some embodiments, the hydrophilic yarn is first immersed in a cleaning agent and then immersed in a passivation solution; wherein the cleaning agent includes a mixture of oxalic acid, sulfuric acid and water; the concentration of oxalic acid in the cleaning agent is 20-30wt%, and the concentration of sulfuric acid in the cleaning agent is 5-10wt%; the passivation solution is a copper passivation solution.

[0057] Specifically, the copper passivation solution is a commercially available copper passivation solution, specifically the copper passivation solution C108 produced by Suzhou Jiuchen Environmental Protection Technology Co., Ltd.

[0058] In some embodiments, the carbon-based material solution includes water and the carbon-based material, that is, the carbon-based material is added to the water to obtain the carbon-based material solution; the concentration of the carbon-based material in the carbon-based material solution is 0.1wt% to 0.25wt%, specifically, the concentration of the carbon-based material is 0.1wt%, 0.15wt%, 0.17wt%, 0.18wt%, 0.19wt%, 0.20wt%, 0.21wt%, 0.22wt%, 0.23wt%, 0.24wt%, and 0.25wt%. The higher the concentration of the carbon-based material, the better the photothermal effect, but too much carbon-based material will cause many problems such as agglomeration, blockage or waste during polymerization.

[0059] In some embodiments, a fancy twisting machine is used to wind the hydrophilic twisted modified yarn around an electric wire to obtain a light-electrothermal yarn, wherein the twist coefficient is 280T / m-300T / m, the rotation speed is 4000r / min-5000r / min, and the winding speed is 1.7m / min-2.2m / min. Specifically, the winding speed is 1.7m / min, 1.8m / min, 1.9m / min, 2.0m / min, 2.1m / min, and 2.2m / min; the hydrophilic twisted modified yarn is used as the base material, and the prepared hydrophilic twisted modified yarn has different fiber densities and distributions, and the rough surface is conducive to solar energy absorption and moisture migration. After the twisting process, the increase in fiber density leads to increased frictional resistance, reduced unevenness, and increased sliding resistance between fibers.

[0060] In some embodiments, in the step of sewing the photo-electrothermal yarn onto the hydrophilic modified fabric, the sewing tension coefficient is 2-3, the stitch width is 0mm-7mm, the stitch length is 0mm-5mm, and the sewing speed is 800r / min-850r / min.

[0061] In some embodiments, the drying temperature in S2 is 65-85° C., and the drying time is 30 min to 60 min.

[0062] In some embodiments, the length of the hydrophilic twisted modified yarn is 8.94 cm to 24.49 cm.

[0063] Based on the same inventive concept, the present invention also provides a sewing textile capable of efficiently desalting, which is prepared by the above-mentioned preparation method.

[0064] Based on the same inventive concept, the present invention also provides a sewing textile capable of high-efficiency desalination prepared by the above-mentioned preparation method or the use of the above-mentioned sewing textile capable of high-efficiency desalination in hydrovoltaic power generation and seawater desalination.

[0065] The above technical solution of the present invention has the following advantages over the prior art:

[0066] The sewing textile of the present invention is a sewing photo-electric heating yarn, which is composed of a core layer of wire and a sheath layer of fiber modified with a carbon-based material. The sewing photo-electric heating textile is custom-designed on a cotton substrate using an automatic sewing machine. The high-efficiency, all-day desalination sewing textile device of the present invention has the properties of photothermal conversion, water flow supply, and optimized evaporation rate. Evaporation efficiency is affected by evaporation conversion rate, heat distribution, and evaporation utilization rate. By controlling the sewing pattern, not only can heat conversion and heat distribution be optimized, but also evaporation utilization rate can be improved. Moderate DC input can be manipulated to achieve optimal evaporation utilization performance. At the same time, the carbon-based material provides sufficient photothermal input for interfacial evaporation. The hydrophilic substrate enables moderate water supply and continuous brine circulation, achieving efficient and long-lasting desalination. Most common impurity ions and dye contaminants can also be removed during the seawater desalination process. This solution operates under a 2V DC input and 1 sun (i.e., 1 sun generally refers to the standard solar irradiance received by the Earth's surface, i.e., 1000 watts per square meter (W / m2)). 2 )) achieved 2.43kg m -2 ·h -1 Excellent evaporation rate. Stable and continuous desalination was achieved in 3.5 wt% brine with no salt accumulation after 24 hours of operation.

[0067] The following further illustrates the present invention's highly efficient desalination sewing textiles, their preparation methods, and applications with specific examples. This section further illustrates the present invention with reference to specific examples, but should not be construed as limiting the present invention. Unless otherwise specified, the techniques employed in the examples are conventional techniques well known to those skilled in the art. Unless otherwise specified, the reagents, methods, and equipment employed in the present invention are conventional reagents, methods, and equipment in the art.

[0068] In the following examples, the Tencel fibers are those produced by Lenzing AG. TM Brand lyocell fiber; the passivation liquid in the following examples is the copper passivation liquid C108 produced by Suzhou Jiuchen Environmental Protection Technology Co., Ltd.

[0069] Example 1

[0070] The present invention provides a method for preparing a sewing textile capable of efficient desalination, comprising the following steps:

[0071] S1. Add Tencel fibers to water and perform ultrasonic treatment. Add the ultrasonically treated Tencel fibers to 60° C. anhydrous ethanol and stir at a constant temperature for 2 h to remove impurities and contaminants inside or on the surface of the fibers. After drying, four strands of Tencel fibers are passed through a ring spinning machine to produce Tencel twisted yarn. The main shaft speed is set to 6000 r / min and the twist coefficient is set to 5 T / cm.

[0072] S2. Pre-treating the Tencel twisted yarn by immersing it in a cleaning agent for 60 minutes and then immersing it in a passivation solution for 5 minutes. After the pre-treatment, the yarn is dried for 30 minutes to prevent rusting, thereby obtaining the pre-treated Tencel twisted yarn; wherein the cleaning agent comprises a mixture of oxalic acid, sulfuric acid, and water; the concentration of oxalic acid in the cleaning agent is 25 wt %, and the concentration of sulfuric acid in the cleaning agent is 8 wt %;

[0073] S3, immersing the pretreated Tencel twisted yarn in a 0.15 wt% single-walled carbon nanotube dispersion (single-walled carbon nanotubes are added to water to obtain a 0.15 wt% single-walled carbon nanotube dispersion) for 60 min for loading, and then drying in an oven at 60° C. for 30 min to obtain a modified Tencel twisted yarn (the modified Tencel twisted yarn is 8.94 cm);

[0074] S4. Using a fancy twisting machine, the modified Tencel twisted yarn is wound around an electric wire to produce a light-electrothermal yarn; the twist coefficient is 280 T / m; the rotation speed is 4000 r / min; and the winding speed is 1.7 m / min;

[0075] S5, impregnating the cotton fabric with a 0.15 wt% single-walled carbon nanotube dispersion for 60 min for loading, and then drying in an oven at 60° C. for 1 h to obtain a modified cotton fabric;

[0076] S6. Use a sewing machine to sew the photo-electrothermal yarn onto the modified cotton fabric to obtain a sewing textile (SPEY) that can efficiently desalinate; the sewing tension coefficient is 2, the stitch width is 2 mm, the stitch length is 2 mm, the sewing speed is 800 r / min, the length of the modified Tencel twisted yarn is 8.94 cm, and the prepared sewing textile is named SET-1.

[0077] Example 2

[0078] The present invention provides a method for preparing a sewing textile capable of efficient desalination, comprising the following steps:

[0079] S1. Add Tencel fibers to water and perform ultrasonic treatment. Add the ultrasonically treated Tencel fibers to 60° C. anhydrous ethanol and stir at a constant temperature for 2 h to remove impurities and contaminants inside or on the surface of the fibers. After drying, four strands of Tencel fibers are passed through a ring spinning machine to produce Tencel twisted yarn. The main shaft speed is set to 6000 r / min and the twist coefficient is set to 5 T / cm.

[0080] S2. Pre-treating the Tencel twisted yarn by immersing it in a cleaning agent for 60 minutes and then immersing it in a passivation solution for 5 minutes. After the pre-treatment, the yarn is dried for 30 minutes to prevent rusting, thereby obtaining the pre-treated Tencel twisted yarn; wherein the cleaning agent comprises a mixture of oxalic acid, sulfuric acid, and water; the concentration of oxalic acid in the cleaning agent is 25 wt %, and the concentration of sulfuric acid in the cleaning agent is 8 wt %;

[0081] S3, immersing the pretreated Tencel twisted yarn in a 0.15 wt% single-walled carbon nanotube dispersion for 60 min for loading, and then drying in an oven at 60° C. for 30 min to obtain a modified Tencel twisted yarn (the modified Tencel twisted yarn is 13.65 cm);

[0082] S4. Using a fancy twisting machine, the modified Tencel twisted yarn is wound around an electric wire to produce a light-electrothermal yarn; the twist coefficient is 280 T / m; the rotation speed is 4000 r / min; and the winding speed is 1.7 m / min;

[0083] S5, impregnating the cotton fabric with a 0.15 wt% single-walled carbon nanotube dispersion for 60 min for loading, and then drying in an oven at 60° C. for 1 h to obtain a modified cotton fabric;

[0084] S6. Use a sewing machine to sew the photo-electrothermal yarn onto the modified cotton fabric to obtain a sewing textile (SPEY) that can efficiently desalinate; the sewing tension coefficient is 2, the stitch width is 2 mm, the stitch length is 2 mm, the sewing speed is 800 r / min, the length of the modified Tencel twisted yarn is 13.65 cm, and the prepared sewing textile is named SET-2.

[0085] Example 3

[0086] The present invention provides a method for preparing a sewing textile capable of efficient desalination, comprising the following steps:

[0087] S1. Add Tencel fibers to water and perform ultrasonic treatment. Add the ultrasonically treated Tencel fibers to 60° C. anhydrous ethanol and stir at a constant temperature for 2 h to remove impurities and contaminants inside or on the surface of the fibers. After drying, four strands of Tencel fibers are passed through a ring spinning machine to produce Tencel twisted yarn. The main shaft speed is set to 6000 r / min and the twist coefficient is set to 5 T / cm.

[0088] S2. Pre-treating the Tencel twisted yarn by immersing it in a cleaning agent for 60 minutes and then immersing it in a passivation solution for 5 minutes. After the pre-treatment, the yarn is dried for 30 minutes to prevent rusting, thereby obtaining the pre-treated Tencel twisted yarn; wherein the cleaning agent comprises a mixture of oxalic acid, sulfuric acid, and water; the concentration of oxalic acid in the cleaning agent is 25 wt %, and the concentration of sulfuric acid in the cleaning agent is 8 wt %;

[0089] S3, immersing the pretreated Tencel twisted yarn in a 0.15 wt% single-walled carbon nanotube dispersion for 60 min for loading, and then drying in an oven at 60° C. for 30 min to obtain a modified Tencel twisted yarn (the modified Tencel twisted yarn has a length of 16.49 cm);

[0090] S4. Using a fancy twisting machine, the modified Tencel twisted yarn is wound around an electric wire to produce a light-electrothermal yarn; the twist coefficient is 280 T / m; the rotation speed is 4000 r / min; and the winding speed is 1.7 m / min;

[0091] S5, impregnating the cotton fabric with a 0.15 wt% single-walled carbon nanotube dispersion for 60 min for loading, and then drying in an oven at 60° C. for 1 h to obtain a modified cotton fabric;

[0092] S6. Use a sewing machine to sew the photo-electrothermal yarn onto the modified cotton fabric to obtain a sewing textile (SPEY) that can efficiently desalinate; the sewing tension coefficient is 2, the stitch width is 2 mm, the stitch length is 2 mm, the sewing speed is 800 r / min, the length of the modified Tencel twisted yarn is 16.49 cm, and the prepared sewing textile is named SET-3.

[0093] Example 4

[0094] The present invention provides a method for preparing a sewing textile capable of efficient desalination, comprising the following steps:

[0095] S1. Add Tencel fibers to water and perform ultrasonic treatment. Add the ultrasonically treated Tencel fibers to 60° C. anhydrous ethanol and stir at a constant temperature for 2 h to remove impurities and contaminants inside or on the surface of the fibers. After drying, four strands of Tencel fibers are passed through a ring spinning machine to produce Tencel twisted yarn. The main shaft speed is set to 6000 r / min and the twist coefficient is set to 5 T / cm.

[0096] S2. Pre-treating the Tencel twisted yarn by immersing it in a cleaning agent for 60 minutes and then immersing it in a passivation solution for 5 minutes. After the pre-treatment, the yarn is dried for 30 minutes to prevent rusting, thereby obtaining the pre-treated Tencel twisted yarn; wherein the cleaning agent comprises a mixture of oxalic acid, sulfuric acid, and water; the concentration of oxalic acid in the cleaning agent is 25 wt %, and the concentration of sulfuric acid in the cleaning agent is 8 wt %;

[0097] S3, immersing the pretreated Tencel twisted yarn in a 0.15 wt % single-walled carbon nanotube dispersion for 60 min for loading, and then drying in an oven at 60° C. for 30 min to obtain a modified Tencel twisted yarn (the modified Tencel twisted yarn has a length of 20.94 cm);

[0098] S4. Using a fancy twisting machine, the modified Tencel twisted yarn is wound around an electric wire to produce a light-electrothermal yarn; the twist coefficient is 280 T / m; the rotation speed is 4000 r / min; and the winding speed is 1.7 m / min;

[0099] S5, impregnating the cotton fabric with a 0.15 wt% single-walled carbon nanotube dispersion for 60 min for loading, and then drying in an oven at 60° C. for 1 h to obtain a modified cotton fabric;

[0100] S6. Use a sewing machine to sew the photo-electrothermal yarn onto the modified cotton fabric to obtain a sewing textile (SPEY) that can efficiently desalinate; the sewing tension coefficient is 2, the stitch width is 2 mm, the stitch length is 2 mm, the sewing speed is 800 r / min, the length of the modified Tencel twisted yarn is 20.94 cm, and the prepared sewing textile is named SET-4.

[0101] Example 5

[0102] The present invention provides a method for preparing a sewing textile capable of efficient desalination, comprising the following steps:

[0103] S1. Add Tencel fibers to water and perform ultrasonic treatment. Add the ultrasonically treated Tencel fibers to 60° C. anhydrous ethanol and stir at a constant temperature for 2 h to remove impurities and contaminants inside or on the surface of the fibers. After drying, four strands of Tencel fibers are passed through a ring spinning machine to produce Tencel twisted yarn. The main shaft speed is set to 6000 r / min and the twist coefficient is set to 5 T / cm.

[0104] S2. Pre-treating the Tencel twisted yarn by immersing it in a cleaning agent for 60 minutes and then immersing it in a passivation solution for 5 minutes. After the pre-treatment, the yarn is dried for 30 minutes to prevent rusting, thereby obtaining the pre-treated Tencel twisted yarn; wherein the cleaning agent comprises a mixture of oxalic acid, sulfuric acid, and water; the concentration of oxalic acid in the cleaning agent is 25 wt %, and the concentration of sulfuric acid in the cleaning agent is 8 wt %;

[0105] S3, immersing the pretreated Tencel twisted yarn in a 0.15 wt % single-walled carbon nanotube dispersion for 60 min for loading, and then drying in an oven at 60° C. for 30 min to obtain a modified Tencel twisted yarn (the modified Tencel twisted yarn has a length of 24.49 cm);

[0106] S4. Using a fancy twisting machine, the modified Tencel twisted yarn is wound around an electric wire to produce a light-electrothermal yarn; the twist coefficient is 280 T / m; the rotation speed is 4000 r / min; and the winding speed is 1.7 m / min;

[0107] S5, impregnating the cotton fabric with a 0.15 wt% single-walled carbon nanotube dispersion for 60 min for loading, and then drying in an oven at 60° C. for 1 h to obtain a modified cotton fabric;

[0108] S6. Use a sewing machine to sew the photo-electrothermal yarn onto the modified cotton fabric to obtain a sewing textile (SPEY) that can efficiently desalinate; the sewing tension coefficient is 2, the stitch width is 2 mm, the stitch length is 2 mm, the sewing speed is 800 r / min, the length of the modified Tencel twisted yarn is 24.49 cm, and the prepared sewing textile is named SET-5.

[0109] Performance Testing

[0110] Figure 1 Finite element simulation analysis of SPEY of different lengths prepared in Examples 1 to 5; Figure 2 The cloud diagram shows the SPEY of different lengths prepared in Examples 1 to 5; Figure 3 The actual temperature performance of SPEY of different lengths prepared in Examples 1 to 5 on cotton fabric.

[0111] in, Figures 1 to 3 The five figures in the middle are, from left to right, sewing textiles SET-1 to SET-5 prepared in Examples 1 to 5 respectively.

[0112] from Figure 1 It can be seen that finite element analysis was used to study the electrothermal conversion performance of SET1 to SET5 and the heat transfer performance of the cotton matrix. SET-1 has the highest stable phase transition temperature, but the largest surface temperature gradient. As the length of SPEY increases, the heating uniformity of SETY gradually improves, but its average heating performance gradually weakens. This phenomenon can be explained by the following analysis: (1) Increasing the length of SPEY can increase the coverage area of ​​the heat dissipation element, thereby improving the heating uniformity. (2) However, according to Joule's law, SPEY with excessive length leads to increased resistance and weakened electrothermal conversion performance. Therefore, the sewing electrothermal mode should be improved to make the heat distribution reasonable. Figure 2The SETY surface temperature is recorded in each of the 100 areas in the dot matrix using thermocouples. The temperature distribution cloud is then drawn based on the stable temperature. Figure 3 SET-4 showed the best electrothermal performance, and we subsequently conducted tests using SET-4. The test results were basically consistent with the simulation results.

[0113] Figure 4 The friction resistance test (specifically rubbing by hand) of the SPE-4 prepared in Example 4 was performed. Figure 4 It can be seen that after 5, 20, 50 and 100 times of friction, there is still no dust shedding and deformation. Due to the adhesion of single-walled carbon nanotubes, the sample has a solid structure and morphology, which is conducive to efficient and stable operation.

[0114] Figure 5 is the electrothermal efficiency of SPE-4 prepared in Example 4 at different input voltages (0.5V to 2.5V), Figure 6 is the evaporation efficiency of SPE-4 prepared in Example 4 under different radiation (0 to 1 sun) at a voltage input of 2 V.

[0115] Specifically, heating wires are connected to both ends of the SPE-4, and the heating wires are connected to the positive and negative poles of the power supply respectively. By controlling the voltage, different voltages can be input to the SPE-4.

[0116] like Figure 5 As shown, the measured electrothermal conversion efficiencies are 25.56%, 14.91%, 21.3%, 25.8%, and 19.25% at input voltages of 0.5, 1.0, 1.5, 2.0, and 2.5 V, respectively. Initially, as the power supply increases, more thermal energy is concentrated on the SET-4 surface. This increase in temperature facilitates subsequent evaporation but also leads to an expansion of the regional thermal gradient. When excess energy is supplied, significant heat is lost to the environment rather than being effectively utilized. Figure 6 It can be seen that electrothermal conversion has a faster heating response rate than photothermal conversion. The evaporation rate increases with the increase of energy supply. At 1V DC input, SET-4 shows high evaporation efficiency but low evaporation rate. Under 1 sun radiation, the evaporation rate at 2.0V voltage input is 2.43kg m -2 ·h -1 Overall, the best evaporation conversion efficiency and evaporation utilization efficiency are achieved when the power input is stabilized at 2 V. The evaporation rate is competitive even under weak radiation, which is critical for outdoor operation in various weather conditions. The evaporation efficiency increases with increasing solar intensity because the synergistic photovoltaic heat input leads to accelerated interfacial evaporation.

[0117] Figure 7For the SPE-4 prepared in Example 4, 3.5 wt% brine (3.5 wt% brine was prepared by adding NaCl to water) was evaporated under 1 sun radiation at different voltage inputs (0 V to 2 V), and the evaporation mass change over time. Figure 8 To investigate the evaporation of a 3.5 wt% brine solution using the SPE-4 prepared in Example 4 under different voltage input conditions (0 V to 2 V), the salt rejection rate of the brine solution during the evaporation process changes with time. The inset conceptual diagram shows the salt rejection mechanism. Figure 9 The SPE-4 prepared in Example 4 was subjected to evaporation of a 3.5 wt% saline solution under 1 sun radiation at different voltages (0 V to 2 V). The SPE-4 changes within 0 to 12 hours.

[0118] like Figure 7 As shown in the figure, the desalination rate with different power inputs is competitive under 3.5wt% simulated brine (global average salinity). The desalination rate is slightly weakened compared with the evaporation rate, which is attributed to the delayed ion-induced phase transition and the smaller saturated vapor pressure. During the long-term operation of 12h, the desalination rate under different power inputs remains stable, meeting the requirements of daily operation ( Figure 8 ).from Figure 9 It can be seen that its excellent salt resistance is due to its strong hydrophilicity and continuous brine circulation. The interconnected fiber channels enable water to flow rapidly. Therefore, the brine replenishment rate is greater than the salt nucleation rate. SET-4 remains clean and intact after long-term desalination under different conditions, which prevents channel blockage and device damage.

[0119] Figure 10 The SPE-4 prepared in Example 4 with a 2V DC input was used to evaporate seawater outdoors (the seawater sample was collected from the Yellow Sea in China), and the outdoor temperature changes and the collection rate of condensed water obtained by evaporating the seawater. Figure 11 The SPE-4 prepared in Example 4 with a 2V DC input was used to evaporate seawater outdoors (seawater samples were collected from the Yellow Sea in China). The ion concentrations of the seawater before evaporation, the changes in the ion concentrations in the condensed water collected after evaporation, and the rejection rates of the ion concentrations were measured. The rejection rate represents the reduction rate of the ion concentrations in the collected condensed water compared to the initial seawater.

[0120] Figure 10 Outdoor testing was conducted over a nine-hour period between 8:00 AM and 5:00 PM. Solar angle, solar intensity, airflow velocity, and ambient temperature vary significantly throughout the day. Consequently, the SET-4's evaporation rate varies with weather conditions. However, the SET-4 remained clean, robust, and efficient during the extended desalination process. Figure 11 Using a 2V DC power supply, the daily continuous condensate collection volume reaches about 19.8L·m-2 The ion purification of SET-4 in seawater was studied. The seawater samples were collected from the Yellow Sea in China. The results showed that Ca 2+ Mg 2+ 、Na + and K + The ion concentrations were 7241 mg·L -1 、8107mg·L -1 、11580mg·L -1 and 5182 mg·L -1 Significantly reduced to 11.37 mg·L -1 、13.56mg·L -1 、88.96mg·L -1 and 5.66 mg·L -1 , meeting the salinity standards for drinking desalinated water set by the WHO. These results demonstrate the feasibility of SET-4 for efficient seawater desalination and wastewater treatment.

[0121] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A method for preparing sewing textiles capable of efficient desalination, characterized in that: The following steps are involved: Twisting several strands of hydrophilic fibers to obtain hydrophilic yarn; The hydrophilic yarn is sequentially immersed in a cleaning agent and a passivation solution, and dried to obtain a hydrophilic twisted yarn; The hydrophilic twisted yarn is immersed in a carbon-based material solution for modification, and then dried to obtain the hydrophilic twisted modified yarn; Winding the hydrophilic twisted modified yarn on an electric wire to obtain a photo-electrothermal yarn; Using a carbon-based material solution to modify the hydrophilic fabric to obtain a hydrophilic modified fabric; The photo-electrothermal yarn is sewn onto the hydrophilic modified fabric to obtain a sewn textile capable of desalination with high efficiency.

2. The method for preparing a sewing textile capable of efficient desalination according to claim 1, wherein: The hydrophilic fiber includes at least one of tencel, cotton, acetate fiber, and wool; And / or, in the steps of immersing the hydrophilic twisted yarn in a carbon-based material solution for modification treatment and using the carbon-based material solution to modify the hydrophilic fabric, the carbon-based material includes at least one of single-walled carbon nanotubes, carbon black, graphene oxide, and MXene; and the hydrophilic fabric includes at least one of Tencel, cotton, acetate fiber, and wool.

3. The method for preparing a sewing textile capable of efficient desalination according to claim 1, wherein: In the step of twisting a plurality of hydrophilic fibers, the twist coefficient is 2T / cm to 6T / cm, the main shaft speed is 5000r / min to 6000r / min, and the number of hydrophilic fibers is 10 to 18.

4. The method for preparing a sewing textile capable of efficient desalination according to claim 1, wherein: The cleaning agent includes a mixture of oxalic acid, sulfuric acid and water; The concentration of oxalic acid in the cleaning agent is 20-30 wt %, and the concentration of sulfuric acid in the cleaning agent is 5-10 wt %.

5. The method for preparing a sewing textile capable of efficient desalination according to claim 1, wherein: The passivation solution is a copper passivation solution.

6. The method for preparing a sewing textile capable of efficient desalination according to claim 1, wherein: The carbon-based material solution comprises water and a carbon-based material, and the concentration of the carbon-based material in the carbon-based material solution is 0.1 wt% to 0.25 wt%.

7. The method for preparing a sewing textile capable of efficient desalination according to claim 1, wherein: The hydrophilic twisted modified yarn is wound around an electric wire using a fancy twisting machine to obtain a photo-electrothermal yarn, wherein the twist coefficient is 280T / m-300T / m, the rotation speed is 4000r / min-5000r / min, and the winding speed is 1.7m / min-2.2m / min.

8. The method for preparing a sewing textile capable of efficient desalination according to claim 1, wherein: In the step of sewing the photo-electrothermal yarn onto the hydrophilic modified fabric, the sewing tension coefficient is 2-3, the stitch width is 2 mm-7 mm, the stitch length is 2 mm-5 mm, and the sewing speed is 800 rpm-850 rpm; And / or, the length of the hydrophilic twisted modified yarn is 8.94 cm to 24.49 cm.

9. A sewing textile capable of efficient desalination, characterized in that: The preparation method is as described in any one of claims 1 to 8.

10. Use of a sewing textile capable of high-efficiency desalination prepared by the preparation method according to any one of claims 1 to 8 or a sewing textile capable of high-efficiency desalination according to claim 9 in hydrovoltaic power generation and seawater desalination.

Images