CN-117487527-B - Solar water evaporation photo-thermal conversion material, and preparation method and application thereof

Abstract

The invention relates to a solar water evaporation photo-thermal conversion material, a preparation method and application thereof, wherein the solar water evaporation photo-thermal conversion material comprises flower-shaped MoS 2 and a porous carbon film, flower-shaped MoS 2 is uniformly dispersed on the surface and inside of the porous carbon film, the size is 200nm-1 mu m, the solar water evaporation photo-thermal conversion material consists of mutually-intersected nano sheets, and the mass percentage of flower-shaped MoS 2 in the photo-thermal conversion material is 8-50%. The preparation method comprises the steps of preparing a PAN (PAN) base film doped with carbon nanotubes by a phase inversion method, obtaining a porous carbon film after pre-oxidation and carbonization, and uniformly loading flower-shaped MoS 2 on the surface and inside of the porous carbon film by a hydrothermal method. The material designed by the invention has the synergistic absorption and conversion capability of the porous carbon film and MoS 2 on sunlight, effectively improves the solar water evaporation efficiency, has rich pore channels, can transport moisture and conduct heat, and flower-shaped MoS 2 can increase the internal reflection and light absorption of light and convert the light absorption into heat energy to be conducted to the film, thereby reducing the reflection loss of the light on the film surface and improving the light utilization rate.

Inventors

• LI XIANGCUN
• YAO YAO
• ZHAO ZEBIN
• YANG MINGZHAO
• LEI RUI
• LI FEIFEI
• LI SHUANG
• HE GAOHONG
• JIANG HELONG

Assignees

• 陕西煤业化工技术研究院有限责任公司
• 大连理工大学

Dates

Publication Date

20260508

Application Date

20231107

Claims (9)

1. 1. A solar water evaporation photo-thermal conversion material is characterized by comprising flower-shaped MoS 2 and a porous carbon film, wherein flower-shaped MoS 2 is uniformly loaded on the surface and inside of the porous carbon film, flower-shaped MoS 2 is 200 nm-1 mu m in size and is composed of mutually crossed nano sheets, the mass percentage of flower-shaped MoS 2 in the photo-thermal conversion material is 8-50%, the material is used for solar water evaporation photo-thermal conversion, a preparation method of the solar water evaporation photo-thermal conversion material is characterized in that a PAN base film doped with carbon nano tubes is prepared by a phase conversion method, the porous carbon film is obtained by pre-oxidizing and carbonizing, ammonium molybdate and thiourea are mixed, and flower-shaped MoS 2 is uniformly loaded on the porous carbon film by a hydrothermal method.
2. 2. A preparation method of a solar water evaporation photo-thermal conversion material as defined in claim 1 is characterized by comprising the following steps: (1) Preparation of porous carbon film Mixing polyacrylonitrile, carbon nano tube and N, N-dimethylformamide, heating and stirring in an oil bath until a uniform and viscous black casting solution is formed, after the casting solution is cooled to room temperature, coating the casting solution on a dry and clean glass plate to form a liquid film by using an automatic coating machine, rapidly transferring the glass plate into deionized water, forming a PAN (poly-N-carbonate) base film doped with the carbon nano tube based on a phase inversion principle, taking out and airing after soaking 12-24 h, transferring the film into a vacuum drying oven for vacuum drying to remove residual moisture in the film, transferring the dried film into a muffle furnace for pre-oxidation, and carbonizing in a tubular furnace to obtain a porous carbon film-CNT/C film; (2) Preparation of MoS 2 -CNT/C film Stirring and dissolving ammonium molybdate and thiourea in deionized water at room temperature to obtain colorless uniform hydrothermal solution, pouring the hydrothermal solution into a polytetrafluoroethylene reaction kettle, then placing a CNT/C film, sealing, placing the reaction kettle into a muffle furnace, setting a heating program, performing hydrothermal reaction, and naturally cooling to room temperature to obtain the MoS 2 -CNT/C film.
3. 3. The method of claim 2, wherein the polyacrylonitrile used in the step (1) has a molecular weight of 150000, the N, N-dimethylformamide solution is analytically pure, and the carbon nanotubes are CNT-305.
4. 4. The method for preparing a solar water evaporation photo-thermal conversion material as claimed in claim 2, wherein the stirring temperature of the oil bath in the step (1) is 60-80 ℃ and the time is 18-24 h.
5. 5. The method of claim 2, wherein the pre-oxidation process in the step (1) has a temperature rising rate of 2 ℃ min -1 , a pre-oxidation time of 1-3 h, a pre-oxidation temperature of 120-320 ℃ and a temperature lowering rate of 1-10 ℃ min -1 .
6. 6. The method of claim 2, wherein the carbonization time in the step (1) is 0.5-3 h and the carbonization temperature is 600-900 ℃.
7. 7. The method for preparing a solar water evaporation photo-thermal conversion material according to claim 2, wherein the ammonium molybdate added amount in the hydrothermal solution in the step (2) is 0.4-0.9 mg mL -1 , and the thiourea added amount is 2-5 mg mL -1 .
8. 8. The method for preparing a solar water evaporation photo-thermal conversion material as claimed in claim 2, wherein the hydrothermal temperature in the step (2) is 180-200 ℃ and the hydrothermal time is 12-24 h.
9. 9. A solar water evaporator is characterized in that a photo-thermal conversion material or a water evaporation material of the evaporator adopts the solar water evaporation photo-thermal conversion material according to claim 1.

Description

Solar water evaporation photo-thermal conversion material, and preparation method and application thereof Technical Field The invention belongs to the technical field of fresh water collection, and particularly relates to a solar water evaporation photo-thermal conversion material, a preparation method and application thereof. Background The problems of water resource pollution and fresh water resource shortage are increasingly serious due to the development of industry and the rapid population growth, but the fresh water resource has important strategic significance and is important for the sustainable development of human society. The conventional water treatment technology mostly produces clean water at the cost of high energy consumption, and is expensive and pollutes the environment. In the face of shortage of fossil energy and environmental problems around the world, water treatment by using renewable energy sources is a trend of development in the future. Solar energy is an inexhaustible clean energy source, and based on this, solar-driven interfacial water evaporation technology is receiving a great deal of attention. Compared with the traditional technology, the interface water evaporation technology adopts interface heating, limits heat at the gas-liquid interface, and only heats part of water at the interface, thereby greatly improving the utilization rate of heat and the evaporation rate of water. The photo-thermal conversion material is one of key conditions for realizing efficient solar water evaporation, and has high solar energy absorption capacity and photo-thermal conversion capacity in the whole solar spectrum range, so that the maximum utilization of solar radiation energy can be realized. Therefore, the preparation of the efficient and stable solar water evaporation photo-thermal conversion material is particularly important. Disclosure of Invention The invention aims to provide a solar water evaporation photo-thermal conversion material, a preparation method and application thereof, wherein the photo-thermal conversion material is formed by compounding flower-shaped MoS 2 and a porous carbon film, flower-shaped MoS 2 is formed by mutually crossed nano sheets, the photo-thermal conversion material is prepared by a phase conversion method and a hydrothermal method, the cooperative absorption and conversion capacity of the porous carbon film and flower-shaped MoS 2 on sunlight effectively improves the solar water evaporation efficiency, and the structure is optimized, so that the surface waviness is improved, the photo-thermal conversion material has good refraction and absorption effects on light, the reflection of the light on the film surface is effectively reduced, and the solar water evaporation efficiency is improved. In order to achieve the above object, the technical scheme of the present invention is as follows: The solar water evaporation photo-thermal conversion material comprises flower-shaped MoS 2 and a porous carbon film, wherein flower-shaped MoS 2 is uniformly dispersed on the surface and inside of the porous carbon film, the flower-shaped MoS 2 is 200nm-1 mu m in size and is composed of mutually-intersected nano sheets, and the mass percentage of flower-shaped MoS 2 in the photo-thermal conversion material is 8-50%. According to the preparation method of the solar water evaporation photo-thermal conversion material, a PAN base film doped with carbon nano tubes is prepared through a phase conversion method, a porous carbon film is obtained through pre-oxidation and carbonization, ammonium molybdate, thiourea and water are mixed, and flower-shaped MoS 2 is uniformly loaded on the porous carbon film through a hydrothermal method. The preparation method of the solar water evaporation photo-thermal conversion material specifically comprises the following steps: (1) Preparation of porous carbon film Mixing polyacrylonitrile, carbon nano tube and N, N-dimethylformamide, heating and stirring in an oil bath until a uniform and viscous black casting solution is formed, after the casting solution is cooled to room temperature, coating the casting solution on a dry and clean glass plate by using an automatic coating machine to form a liquid film, rapidly transferring the glass plate into deionized water, forming a PAN (poly-N-carbonate) base film doped with the carbon nano tube based on a phase inversion principle, taking out and airing after soaking for 12-24 hours, transferring the PAN base film into a vacuum drying oven for vacuum drying to remove residual water in the film, transferring the dried film into a muffle furnace for pre-oxidation, and carbonizing in a tubular furnace to obtain a porous carbon film-CNT/C film; (2) Preparation of MoS 2 -CNT/C film Stirring and dissolving ammonium molybdate and thiourea in deionized water at room temperature to obtain colorless uniform hydrothermal solution, pouring the hydrothermal solution into a polytetrafluoroethylene reaction kettle