A low-cost photothermal material based on solar interface evaporation and its preparation method

Abstract

The invention discloses a low-cost photothermal material based on solar energy interface evaporation and a preparation method thereof. The preparation method is carried out as follows: 1) immerse melamine foam in aniline solution, then add oxidant solution to react, then soak melamine foam The cotton is taken out, washed, and dried to obtain a polyaniline / melamine foam composite structure, which is marked as PMF; 2) Add linear alkanoic acid and nano-titanium dioxide to lower alcohols, and then immerse PMF into the titanium-containing After the reaction is carried out in the mixed solution, the PMF is taken out, washed and dried, and the preparation is completed. The present invention innovatively utilizes the self-assembly properties of straight-chain alkyl acid, titanium dioxide, melamine foam and polyaniline to anchor TiO 2 Nanoparticles realize the construction of micro-nano structure on the surface, with high-efficiency evaporation rate, photothermal conversion performance and dye degradation performance, and its evaporation rate is as high as 2.346kg m under one sunlight ‑2 h ‑1 , the light-to-heat conversion efficiency can be as high as 128.38%.

Description

technical field [0001] The invention belongs to the field of water treatment and surface function modification, in particular to a low-cost photothermal material based on solar interface evaporation and a preparation method thereof. Background technique [0002] my country's water resources are short, and the per capita water resources are only 1 / 4 of the world's average level. The shortage of fresh water resources is an urgent problem that needs to be solved. Seawater desalination and sewage purification are two effective ways to solve water shortages. At present, clean water is mainly obtained through methods such as reverse osmosis, multi-stage flash evaporation and low-temperature multi-effect distillation, but these methods consume a lot of fuel and electricity. Therefore, we urgently need to develop a low-cost, green and sustainable new technology. As a green renewable energy, solar energy has attracted more and more attention from experts and scholars at home and abr...

AI Technical Summary

Problems solved by technology

However, in the process of solar photothermal desalination, pollutants such as salt and microorganisms may be generated on the surface and inside, which seriously restrict water supply, damage the absorption of light by photothermal materials, and block pores, resulting in a decrease in steam conversion rate.

Especially for wastewater, it inevitably involves complex biogeochemical environment and complex components, which increases the difficulty of purification

[0004] Chinese patent CN111170393A discloses a solar evaporator with a hollow structure and its preparation. This method forms a hollow convex solar evaporator through hydrothermal reaction, but its evaporation rate is only 1.476kg m -2 h -1 , the evaporation efficiency is only 92.9%, and the performance needs to be improved

Chinese patent CN111282443A discloses a membrane material for desalination of seawater by solar energy interface evaporation and its preparation method. The method prepares PAA nanofiber membrane by electrospinning technology, then imidizes to obtain PI nanofiber membrane, and finally uses laser ablation technology to obtain porous and fluffy graphite fibers, the preparation process of this method is complicated and the evaporation rate is only 1.595kg·m under one sun light -2 h -1 , the performance needs to be improved

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