A method for improving the photo-thermal water evaporation capacity of silver / polyazole on seaweed nonwoven fabric

Abstract

The application discloses a method for improving the light-thermal water evaporation capacity of silver / polyazole on seaweed non-woven fabrics, and is characterized by the following processes: (1) a dispersion liquid containing 0.12 mol / L silver nitrate, 0.1 mol / L dodecyl trimethyl ammonium chloride and 0.12 mol / L pyrrole is prepared by using deionized water, ultrasonic treatment is carried out for 10 min at 30 DEG C, and the reaction is carried out for 8 h in the dark, and ultrasonic treatment is carried out for 5 min every 20 min, so as to prepare a silver / polyazole composite dispersion liquid; (2) the silver / polyazole dispersion liquid prepared in the above step is diluted by 4 times, then a seaweed non-woven fabric which is fully soaked, flattened and dried is immersed, the bath ratio is 100:1, the seaweed non-woven fabric is taken out after being immersed for 15 min, is washed by deionized water and is dried at 40 DEG C. It is tested that the light-thermal water evaporation capacity of the silver / polyazole composite on the seaweed non-woven fabric can be obviously improved by using the method.

Description

Technical Field

[0001] This invention relates to a method for improving the photothermal evaporation capacity of silver / polypyrrole on seaweed nonwoven fabrics, belonging to the field of textile printing and dyeing technology. Background Technology

[0002] In recent years, interfacial water evaporation technology based on photothermal materials has attracted widespread attention due to its advantages such as low cost, simplicity, and environmental friendliness. This method utilizes photothermal materials to convert absorbed light energy into heat energy to accelerate water evaporation. Compared with traditional overall heating and bottom heating, it greatly reduces heat loss during the evaporation process and significantly improves the efficiency of photothermal conversion, effectively obtaining fresh water from various water sources.

[0003] Currently, the most studied photothermal materials include metal nanomaterials, semiconductor materials, carbon-based materials, and organic polymer materials. Metal materials can absorb a certain range of light under illumination. When the vibration frequency of the incident light matches the resonant frequency of the free electrons on the surface of the metal particles, the free electrons oscillate, thus generating heat energy. However, the preparation cost of metal nanomaterials is relatively high, and their photothermal conversion efficiency needs further improvement. Organic polymers such as polypyrrole and polythiophene possess excellent light absorption and photothermal conversion properties and are often used to composite with metal materials to enhance their performance.

[0004] Besides the photothermal conversion materials, the matrix material serving as the support also significantly impacts the performance of photothermal evaporation. Typically, the matrix material separates the evaporation zone from the water body, reducing heat loss to the water while utilizing capillary effects to ensure a continuous water supply to the evaporation zone. Currently, research on various nonwoven materials as support matrices has garnered attention. Nonwoven materials offer advantages such as mature large-scale production, adjustable material thickness and pore size, and exhibit excellent moisture transport and thermal management performance. For example, nonwoven materials composed of polyvinylidene fluoride fiber, viscose fiber, carbon fiber, polypropylene / polyethylene bicomponent fiber, and polyethylene terephthalate / polypropylene composite fiber have all been used as support matrices in photothermal evaporation systems. Summary of the Invention

[0005] In the preparation of silver / polypyrrole composite, the present invention utilizes the cationic modifier dodecyltrimethylammonium chloride to modify the composite, and then attaches it to the seaweed nonwoven fabric matrix, which can effectively improve its photothermal evaporation capacity.

[0006] This invention mainly relates to the following processes: (1) A dispersion containing 0.12 mol / L silver nitrate, 0.1 mol / L dodecyltrimethylammonium chloride and 0.12 mol / L pyrrole was prepared using deionized water, sonicated at 30℃ for 10 min and reacted in the dark for 8 h, and sonicated for 5 min every 20 min to obtain a silver / polypyrrole composite dispersion. (2) Dilute the silver / polypyrrole dispersion prepared above by 4 times, then immerse the seaweed nonwoven fabric that has been fully wetted, rolled flat and dried in the solution at a bath ratio of 100:1, soak for 15 minutes, take it out, rinse with deionized water and dry at 40°C.

[0007] In the above preparation process, silver nitrate acts as an oxidant, while pyrrole acts as a reducing agent. The two undergo a redox reaction to generate a silver / polypyrrole complex. Dodecyltrimethylammonium chloride plays an auxiliary modifying role, not only maintaining the stable dispersion of the complex in the aqueous medium but also altering the properties of the silver / polypyrrole complex, which is beneficial for improving subsequent water evaporation capacity. The silver / polypyrrole dispersion prepared above was diluted 4 times, and then the thoroughly wetted, rolled, and dried seaweed nonwoven fabric was immersed in it at a bath ratio of 100:1 for 15 minutes. After immersion, it was removed, rinsed with deionized water, and dried at 40°C. During this process, a large amount of the dodecyltrimethylammonium chloride-modified silver / polypyrrole complex adhered to the seaweed nonwoven fabric. After washing and drying, a photothermal evaporation system was formed.

[0008] The method of this invention can improve the photothermal evaporation capacity of silver / polypyrrole composites on seaweed nonwoven fabrics, which can be attributed to the following factors: First, dodecyltrimethylammonium chloride has a dispersing effect, which not only allows the silver / polypyrrole composite to be stably dispersed in water, but also facilitates its uniform adhesion and distribution on the seaweed fabric, which is beneficial for subsequent full contact and absorption of light waves, thus improving the photothermal evaporation capacity. Second, dodecyltrimethylammonium chloride can make the surface of the silver / polypyrrole composite carry a positive charge, which can attract the seaweed fabric (which is negatively charged) through electrostatic force, thereby making it adhere more firmly to the seaweed fabric, thus improving the photothermal evaporation capacity. Finally, the silver / polypyrrole composite modified by dodecyltrimethylammonium chloride can also block the carboxyl and hydroxyl groups on the seaweed macromolecules, weakening their ionization, hydrophilicity, and hydration capabilities. This is beneficial for maintaining the internal pore morphology of the seaweed fabric and reducing the binding and obstruction of water molecules. This reduces the resistance of water molecules when passing through the internal pores of the fabric, increases the freedom of water molecule flow, and makes it easier for water molecules to reach the fabric surface, thus improving the water evaporation effect. Detailed Implementation

[0009] The present invention will be further illustrated by means of examples and comparative examples.

[0010] Example 1 (1) A dispersion containing 0.12 mol / L silver nitrate, 0.1 mol / L dodecyltrimethylammonium chloride and 0.12 mol / L pyrrole was prepared using deionized water, sonicated at 30℃ for 10 min and reacted in the dark for 8 h, and sonicated for 5 min every 20 min to obtain a silver / polypyrrole composite dispersion. (2) Dilute the silver / polypyrrole dispersion prepared above by 4 times, then immerse the seaweed nonwoven fabric that has been fully wetted, rolled flat and dried in the solution at a bath ratio of 100:1, soak for 15 minutes, take it out, rinse with deionized water and dry at 40°C.

[0011] Comparative Example 1 No modifier is added during the preparation of the silver / polypyrrole composite, as detailed below: (1) A dispersion containing 0.12 mol / L silver nitrate and 0.12 mol / L pyrrole was prepared using deionized water, sonicated at 30℃ for 10 min and reacted in the dark for 8 h, and sonicated for 5 min every 20 min to obtain a silver / polypyrrole composite dispersion. (2) Dilute the silver / polypyrrole dispersion prepared above by 4 times, then immerse the seaweed nonwoven fabric that has been fully wetted, rolled flat and dried in the solution at a bath ratio of 100:1, soak for 15 minutes, take it out, rinse with deionized water and dry at 40°C.

[0012] Comparative Example 2 In the preparation of the silver / polypyrrole composite, the nonionic modifier AEO-9 of the same concentration was used instead of dodecyltrimethylammonium chloride, as follows: (1) A dispersion containing 0.12 mol / L silver nitrate, 0.1 mol / L AEO-9 and 0.12 mol / L pyrrole was prepared using deionized water, sonicated at 30℃ for 10 min and reacted in the dark for 8 h, and sonicated for 5 min every 20 min to obtain a silver / polypyrrole composite dispersion. (2) Dilute the silver / polypyrrole dispersion prepared above by 4 times, then immerse the seaweed nonwoven fabric that has been fully wetted, rolled flat and dried in the solution at a bath ratio of 100:1, soak for 15 minutes, take it out, rinse with deionized water and dry at 40°C.

[0013] Comparative Example 3 In the preparation of the silver / polypyrrole composite, sodium dodecyl sulfate, an anionic modifier of the same concentration, was used instead of dodecyltrimethylammonium chloride, as follows: (1) A dispersion containing 0.12 mol / L silver nitrate, 0.1 mol / L sodium dodecyl sulfate and 0.12 mol / L pyrrole was prepared using deionized water, sonicated at 30℃ for 10 min and reacted in the dark for 8 h, and sonicated for 5 min every 20 min to obtain a silver / polypyrrole composite dispersion. (2) Dilute the silver / polypyrrole dispersion prepared above by 4 times, then immerse the seaweed nonwoven fabric that has been fully wetted, rolled flat and dried in the solution at a bath ratio of 100:1, soak for 15 minutes, take it out, rinse with deionized water and dry at 40°C.

[0014] Seaweed nonwoven fabrics (of the same size) obtained from the treatments in Example 1 and the comparative examples were dripped with the same amount of deionized water and then irradiated under a UV lamp (8 min). The change in fabric mass before and after irradiation was measured to obtain the water loss mass, and the water evaporation rate was calculated using the following formula: Water evaporation rate (%) = (mass of water lost / initial water mass) × 100 Calculations showed that the water evaporation rates measured in Example 1 and Comparative Examples 1, 2, and 3 were 78.07%, 70.73%, 70.24%, and 63.51%, respectively. It can be seen that the method described in this invention can significantly improve the photothermal evaporation capacity of the silver / polypyrrole composite on seaweed nonwoven fabrics.

Claims

1. A method for improving the photothermal evaporation capacity of silver / polypyrrole on seaweed nonwoven fabrics, characterized in that... The following process is adopted: (1) A dispersion containing 0.12 mol / L silver nitrate, 0.1 mol / L dodecyltrimethylammonium chloride and 0.12 mol / L pyrrole was prepared using deionized water, sonicated at 30°C for 10 min and reacted in the dark for 8 h, and sonicated for 5 min every 20 min to obtain a silver / polypyrrole composite dispersion. (2) Dilute the silver / polypyrrole dispersion prepared above by 4 times, then immerse the seaweed nonwoven fabric that has been fully wetted, rolled flat and dried in the solution at a bath ratio of 100:1, soak for 15 minutes, take it out, rinse with deionized water and dry at 40°C.