Sewing textile capable of efficiently desalting as well as preparation method and application of sewing textile

Abstract

The invention provides a sewing textile capable of efficiently desalting as well as a preparation method and application of the sewing textile. The preparation method of the sewing textile capable of efficiently desalting comprises the following steps: twisting a plurality of strands of hydrophilic fibers to obtain hydrophilic yarns; hydrophilic yarns are sequentially soaked in a cleaning agent and a passivation solution, and hydrophilic twisted yarns are obtained after drying; dipping the hydrophilic twisted yarns in a carbon-based material solution for modification treatment, and drying to obtain hydrophilic twisted modified yarns; winding the hydrophilic twisted modified yarn on an electric wire to obtain an optical-electric heating yarn; carrying out modification treatment on the hydrophilic fabric by using the carbon-based material solution to obtain a hydrophilic modified fabric; the optical-electric heating yarn is sewn on the hydrophilic modified fabric, and the sewn textile capable of efficiently desalting is obtained. The sewing textile capable of efficiently desalting has the performance of photo-thermal conversion, water flow supply, evaporation rate optimization and the like.

Description

Technical Field

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

[0002] The global water crisis has become a huge threat to people's daily life 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 performance enhancement. Structural engineering of ambient heat collection, wind energy utilization and all-round solar energy absorption can accelerate evaporation more than material modification. Traditional methods of 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 becomes necessary and meaningful to study the solar steam generator (ESSG) system. 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 essential 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] The prior art discloses the preparation and application of a generator set that combines power generation with seawater desalination. The generator set is combined with seawater desalination equipment, and both the internal combustion generator and the seawater desalination module are arranged in a container. The seawater desalination module can use the waste heat function of the power generation module to promote the evaporation of seawater. However, this achievement does not reflect the salt rejection performance, the stability is poor under long-term operation, the system structure is too complicated, and the cost is too high.

[0005] The prior art also discloses the preparation and application of a solar power-water cogeneration device, which uses water phase change to absorb heat to reduce the working temperature of photovoltaic cells, and uses waste heat to distill seawater to achieve desalination; multi-stage evaporation technology can fully utilize steam sensible heat and condensation latent heat; membrane distillation system can increase fresh water production. However, the complex manufacturing process of this achievement, the difficulty of 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 view of this, the present invention aims at the deficiencies of the prior art and proposes a sewing textile capable of efficient desalination and its preparation method and application, using hydrophilic fibers as the base material and frame for functional load processing, and the hydrophilic fibers are twisted to load carbon-based materials, which are used as both photothermal conversion materials and power generation materials, and can effectively collect charges, which is crucial for water circulation and ion migration. The sewing textile of the present invention has the properties of photothermal conversion, water flow supply, 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 efficiently desalting, comprising the following steps:

[0010] Twisting a number of hydrophilic fibers to obtain hydrophilic yarn;

[0011] The hydrophilic yarn is sequentially immersed in a cleaning agent and a passivation solution, and after drying, a hydrophilic twisted yarn is obtained;

[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 highly efficient desalination.

[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 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, 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 several strands of hydrophilic fibers, during the twisting process, the twist coefficient is 2T / cm to 6T / cm, the spindle speed is 5000r / min to 6000r / min, and the number of strands of the 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 0mm-7mm, the stitch length is 0mm-5mm, and the sewing speed is 800r / min-850r / 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 also provides a sewing textile capable of highly efficient desalination, which is prepared by the preparation method.

[0027] In a third aspect, the present invention also 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 wire and a sheath layer fiber modified by a carbon-based material; 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 desalination process. This scheme achieved 2.43kg m under 2V DC input and 1 solar radiation. -2 ·h -1 Excellent evaporation rate. Stable and continuous desalination was obtained in 3.5wt% brine with no salt accumulation after 24 hours of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order 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 prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

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

[0033] Figure 2 The sewing textiles of different lengths prepared in Examples 1 to 5 are represented in cloud charts;

[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 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 SPE-4 prepared in Example 4 under different radiations at 2 V voltage input;

[0038] Figure 7 The evaporation mass variation over time of 3.5 wt % brine by the SPE-4 prepared in Example 4 under 1 sun radiation at different voltage inputs is shown;

[0039] Figure 8 is 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] Fig. 9 The desalination process of the SPE-4 prepared in Example 4 in a brine with a concentration of 3.5 wt%;

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

[0042] Fig.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 solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

[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 described embodiments 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 creative work 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 the present application, the term "including" means "including but not limited to". Various embodiments of the present invention may be in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be understood as a rigid limitation on the scope of the present invention; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single values ​​within the range. For example, it should be considered that the range description from 1 to 6 has 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 numbered ranges, such as 1, 2, 3, 4, 5 and 6, which apply regardless of the range. In addition, whenever a numerical range is indicated in this article, it is meant to include any quoted numbers (fractions or integers) within the indicated range.

[0046] The present application embodiment provides a method for preparing a sewing textile capable of efficiently desalting, 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 obtaining a hydrophilic twisted yarn after drying;

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

[0050] S4, winding the hydrophilic twisted modified yarn on 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; the hydrophilic fabric includes at least one of Tencel, cotton, acetate fiber, and wool.

[0055] In some embodiments, in the step of twisting a plurality of hydrophilic fibers, during the twisting process, the twist coefficient is 2T / cm to 6T / cm, the spindle speed is 5000r / min to 6000r / min, and the number of hydrophilic fibers is 10 to 18. Through twisting, the hydrophilic fibers are tightly interwoven and entangled with each other to form a hydrophilic twisted yarn with unique inter-fiber 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%, 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 on an electric wire to obtain a light-electrical heating yarn, wherein the twist coefficient is 280T / m-300T / m, the rotation speed is 4000r / min-5000r / min, the winding speed is 1.7m / min-2.2m / min, and specifically, the winding speed is 1.7m / min, 1.8m / min, 1.9m / min, 2.0m / min, 2.1m / min, 2.2m / min; the hydrophilic twisted modified yarn is used as a substrate, 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 friction 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-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 highly efficient desalination, 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 compared with the prior art:

[0066] The sewing textile of the present invention is a sewing photo-electric heating yarn, and the yarn is composed of a core layer wire and a sheath layer fiber modified by a carbon-based material. The sewing photo-electric heating textile is designed with a custom pattern on a cotton substrate using an automatic sewing machine. The high-efficiency all-day desalination sewing textile device of the present invention has the performance 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 can the heat conversion and heat distribution 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 interface evaporation. The hydrophilic substrate can achieve moderate water supply and continuous brine circulation, and realize efficient and lasting desalination. And most common impurity ions and dye pollutants can be removed in the process of seawater desalination. This scheme is under 2V DC input and 1 solar radiation (i.e. 1sun, 1sun usually refers to the standard solar irradiance received by the earth's surface, i.e. 1000 watts / square meter (W / m 2 )) achieved 2.43kg m -2 ·h -1 Excellent evaporation rate. Stable and continuous desalination was obtained in 3.5wt% brine with no salt accumulation after 24 hours of operation.

[0067] The following further describes the sewing textiles capable of efficient desalination and their preparation methods and applications of the present application with specific examples. This section further describes the content of the present invention in conjunction with specific examples, but should not be construed as limiting the present invention. Unless otherwise specified, the technical means used in the examples are conventional means known to those skilled in the art. Unless otherwise specified, the reagents, methods and equipment used in the present invention are conventional reagents, methods and equipment in the art.

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

[0069] Example 1

[0070] The present application embodiment provides a method for preparing a sewing textile capable of efficiently desalting, comprising the following steps:

[0071] S1. Add Tencel fiber to water and perform ultrasonic treatment, add the Tencel fiber after ultrasonic treatment to 60°C anhydrous ethanol and stir at constant temperature for 2 hours to remove impurities and pollutants inside or on the surface of the fiber, and after drying, pass four strands of Tencel fiber through a ring spinning machine to produce Tencel twisted yarn; set the main shaft speed to 6000r / min and the twist coefficient to 5T / cm;

[0072] S2, pre-treating the Tencel twisted yarn by first immersing it in a cleaning agent for 60 minutes, and then immersing it in a passivation solution for 5 minutes, and drying it for 30 minutes after the pre-treatment to prevent rust, 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 25wt%, and the concentration of sulfuric acid in the cleaning agent is 8wt%;

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

[0074] S4. Use a fancy twisting machine to wind the modified Tencel twisted yarn on the wire to produce the light-electric heating yarn; the twist coefficient is 280T / m; the rotation speed is 4000r / min; the winding speed is 1.7m / min;

[0075] S5, using 0.15wt% single-walled carbon nanotube dispersion to immerse cotton fabric for 60 minutes for loading, and then drying in an oven at 60°C for 1 hour to obtain 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 application embodiment provides a method for preparing a sewing textile capable of efficiently desalting, comprising the following steps:

[0079] S1. Add Tencel fiber to water and perform ultrasonic treatment, add the Tencel fiber after ultrasonic treatment to 60°C anhydrous ethanol and stir at constant temperature for 2 hours to remove impurities and pollutants inside or on the surface of the fiber, and after drying, pass four strands of Tencel fiber through a ring spinning machine to produce Tencel twisted yarn; set the main shaft speed to 6000r / min and the twist coefficient to 5T / cm;

[0080] S2, pre-treating the Tencel twisted yarn by first immersing it in a cleaning agent for 60 minutes, and then immersing it in a passivation solution for 5 minutes, and drying it for 30 minutes after the pre-treatment to prevent rust, 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 25wt%, and the concentration of sulfuric acid in the cleaning agent is 8wt%;

[0081] S3, immersing the pretreated Tencel twisted yarn in a 0.15wt% 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. Use a fancy twisting machine to wind the modified Tencel twisted yarn on the wire to produce the light-electric heating yarn; the twist coefficient is 280T / m; the rotation speed is 4000r / min; the winding speed is 1.7m / min;

[0083] S5, using 0.15wt% single-walled carbon nanotube dispersion to immerse the cotton fabric for 60 minutes for loading, and then drying it in an oven at 60°C for 1 hour to obtain 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 application embodiment provides a method for preparing a sewing textile capable of efficiently desalting, comprising the following steps:

[0087] S1. Add Tencel fiber to water and perform ultrasonic treatment, add the Tencel fiber after ultrasonic treatment to 60°C anhydrous ethanol and stir at constant temperature for 2 hours to remove impurities and pollutants inside or on the surface of the fiber, and after drying, pass four strands of Tencel fiber through a ring spinning machine to produce Tencel twisted yarn; set the main shaft speed to 6000r / min and the twist coefficient to 5T / cm;

[0088] S2, pre-treating the Tencel twisted yarn by first immersing it in a cleaning agent for 60 minutes, and then immersing it in a passivation solution for 5 minutes, and drying it for 30 minutes after the pre-treatment to prevent rust, 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 25wt%, and the concentration of sulfuric acid in the cleaning agent is 8wt%;

[0089] S3, immersing the pretreated Tencel twisted yarn in a 0.15wt% 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 length of the modified Tencel twisted yarn is 16.49 cm);

[0090] S4. Use a fancy twisting machine to wind the modified Tencel twisted yarn on the wire to produce the light-electric heating yarn; the twist coefficient is 280T / m; the rotation speed is 4000r / min; the winding speed is 1.7m / min;

[0091] S5, using 0.15wt% single-walled carbon nanotube dispersion to immerse the cotton fabric for 60 minutes for loading, and then drying it in an oven at 60°C for 1 hour to obtain 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 application embodiment provides a method for preparing a sewing textile capable of efficiently desalting, comprising the following steps:

[0095] S1. Add Tencel fiber to water and perform ultrasonic treatment, add the Tencel fiber after ultrasonic treatment to 60°C anhydrous ethanol and stir at constant temperature for 2 hours to remove impurities and pollutants inside or on the surface of the fiber, and after drying, pass four strands of Tencel fiber through a ring spinning machine to produce Tencel twisted yarn; set the main shaft speed to 6000r / min and the twist coefficient to 5T / cm;

[0096] S2, pre-treating the Tencel twisted yarn by first immersing it in a cleaning agent for 60 minutes, and then immersing it in a passivation solution for 5 minutes, and drying it for 30 minutes after the pre-treatment to prevent rust, 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 25wt%, and the concentration of sulfuric acid in the cleaning agent is 8wt%;

[0097] S3, immersing the pretreated Tencel twisted yarn in a 0.15wt% 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 length of the modified Tencel twisted yarn is 20.94 cm);

[0098] S4. Use a fancy twisting machine to wind the modified Tencel twisted yarn on the wire to produce the light-electric heating yarn; the twist coefficient is 280T / m; the rotation speed is 4000r / min; the winding speed is 1.7m / min;

[0099] S5, using 0.15wt% single-walled carbon nanotube dispersion to immerse the cotton fabric for 60 minutes for loading, and then drying it in an oven at 60°C for 1 hour to obtain 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 application embodiment provides a method for preparing a sewing textile capable of efficiently desalting, comprising the following steps:

[0103] S1. Add Tencel fiber to water and perform ultrasonic treatment, add the Tencel fiber after ultrasonic treatment to 60°C anhydrous ethanol and stir at constant temperature for 2 hours to remove impurities and pollutants inside or on the surface of the fiber, and after drying, pass four strands of Tencel fiber through a ring spinning machine to produce Tencel twisted yarn; set the main shaft speed to 6000r / min and the twist coefficient to 5T / cm;

[0104] S2, pre-treating the Tencel twisted yarn by first immersing it in a cleaning agent for 60 minutes, and then immersing it in a passivation solution for 5 minutes, and drying it for 30 minutes after the pre-treatment to prevent rust, 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 25wt%, and the concentration of sulfuric acid in the cleaning agent is 8wt%;

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

[0106] S4. Use a fancy twisting machine to wind the modified Tencel twisted yarn on the wire to produce the light-electric heating yarn; the twist coefficient is 280T / m; the rotation speed is 4000r / min; the winding speed is 1.7m / min;

[0107] S5, using 0.15wt% single-walled carbon nanotube dispersion to immerse the cotton fabric for 60 minutes for loading, and then drying it in an oven at 60°C for 1 hour to obtain 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 is used to study the electrothermal conversion performance of SET1~SET5 and the heat transfer performance of the cotton matrix. SET-1 has the highest stable phase transition temperature, but the surface temperature gradient is the largest. 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 in each of the 100 areas in the dot matrix is ​​recorded using thermocouples. Then a temperature distribution cloud map is drawn based on the stable temperature. Figure 3 It can be seen that SET-4 shows the best performance in electric heat utilization, and then SET-4 was used for testing. The test results are basically consistent with the simulation results.

[0113] Figure 4 The friction resistance test (specifically rubbing by hand) of SPE-4 prepared in Example 4 is as follows: 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 It is the evaporation efficiency of SPE-4 prepared in Example 4 under different radiation (0-1 sun) at 2 V voltage input.

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

[0116] like Figure 5 As shown, at input voltages of 0.5, 1.0, 1.5, 2.0, and 2.5 V, the measured electrothermal conversion efficiencies are 25.56%, 14.91%, 21.3%, 25.8%, and 19.25%, respectively. Initially, as the power supply increases, more thermal energy is concentrated on the SET-4 surface. The increase in temperature is beneficial to subsequent evaporation, but it also leads to an expansion of the regional thermal gradient. When excess energy is provided, there is significant heat loss to the environment instead of effective utilization. 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. Under 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 can be 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 under 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 is prepared by adding NaCl to water) was evaporated under 1 sun radiation at different voltages (0 V to 2 V), and the evaporation mass change over time. Figure 8 To study the evaporation of 3.5 wt % brine solution by 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 schematic diagram shows the salt rejection mechanism. Fig. 9 The SPE-4 prepared in Example 4 is a graph showing the changes in SPE-4 within 0 to 12 hours when evaporating a 3.5 wt% saline solution under 1 sun radiation and at different voltages (0 V to 2 V).

[0118] like Figure 7 As shown, the desalination rate with different power inputs at 3.5wt% simulated brine (global average salinity) is competitive. The desalination rate is slightly weakened compared to the evaporation rate, which is attributed to the ion-induced phase transition delay and the smaller saturated vapor pressure. In the long-term operation of 12h, the desalination rate under different power supplies remains stable, meeting the requirements of daily operation ( Figure 8 ).from Fig. 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 quickly, so 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] Fig.10 The SPE-4 prepared in Example 4 with 2V DC input was used to evaporate seawater outdoors (seawater samples were collected from the Yellow Sea of ​​China), and the outdoor temperature changes and the collection rate of condensed water obtained by evaporating seawater. Fig.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 of ​​China), and the concentrations of various ions in the seawater before evaporation, the changes in the concentrations of various ions in the condensed water collected after evaporation, and the rejection rates of various ion concentrations were measured; the rejection rate represents the reduction rate of the concentrations of various ions in the collected condensed water compared to the initial seawater.

[0120] Fig.10 The outdoor test was conducted over a 9-hour period between 8:00 am and 17:00 pm. The solar radiation angle, solar intensity, airflow speed and ambient temperature vary in a complex manner throughout the day. Therefore, the evaporation rate of SET-4 varies with weather conditions. SET-4 remains clean, strong and efficient during the long desalination process. Fig.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 5182mg·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 WHO. These results prove that SET-4 is feasible for efficient seawater desalination and sewage treatment.

[0121] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. A method for preparing sewing textiles capable of efficient desalination, characterized in that: The following steps are involved: Twisting a number of hydrophilic fibers to obtain hydrophilic yarn; The hydrophilic yarn is sequentially immersed in a cleaning agent and a passivation solution, and after drying, a hydrophilic twisted yarn is obtained; 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 highly efficient desalination.

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

4. The method for preparing a sewing textile capable of efficient desalination according to claim 1, characterized in that: 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, characterized in that: The passivation solution is a copper passivation solution.

6. The method for preparing a sewing textile capable of efficient desalination according to claim 1, characterized in that: 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, characterized in that: 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, characterized in that: 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; And / or, the length of the hydrophilic twisted modified yarn is 8.94 cm to 24.49 cm.

9. A sewing textile capable of efficiently desalinating, 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.

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