Portable photothermal seawater desalination hollow fiber membrane, preparation method, device and application

Abstract

The invention discloses a portable photothermal seawater desalination hollow fiber membrane, a preparation method, a device and an application. The preparation method includes step 1): dispersing and dissolving hydrophilic polymers and nanoparticles in a buffer solution with a pH of 8.5 It is configured as a homogeneous solution in which the ratio of hydrophilic polymer:nanoparticles is 1-20:0-20, and the hollow fiber membrane is flushed with the homogeneous solution for 1-24 hours, and then cleaned and dried for later use to obtain super-hydrophilic hollow membranes on the inner surface. Fiber membrane; step 2): placing the super-hydrophilic hollow fiber membrane on the inner surface obtained in step 1) in an atmosphere of 0.1 to 20 wt% photothermal modification material solution through surface adsorption, surface vapor deposition, surface crosslinking, Suction filtration and / or coating modification are treated for 1-24 hours to prepare a hollow fiber membrane with super-hydrophilic inner surface and photothermal function on the outer surface. The present invention selects a three-dimensional hollow fiber membrane as a base material, and the photothermal seawater desalination hollow fiber membrane obtained through inner / outer surface modification can realize photothermal seawater desalination.

Description

technical field [0001] The invention relates to the technical field of photothermal conversion, in particular to a portable photothermal seawater desalination hollow fiber membrane and a preparation method, device and application thereof. Background technique [0002] Freshwater is one of the basic substances for the survival and development of human society, but at present, only existing in rivers, lakes and underground freshwater that can be directly used by human beings is less than 0.36%. my country has a long coastline, and some islands, coastal saline-alkali areas and inland brackish water areas are all areas lacking fresh water. People have suffered from various diseases due to long-term drinking of water that does not meet the hygienic standards, which directly affects their health and local economic development. Therefore, desalination of seawater and brackish water has become an effective way to expand freshwater sources. [0003] At present, there are many method...

AI Technical Summary

Problems solved by technology

However, the above photothermal materials and devices all use two-dimensional photothermal conversion surfaces to perform photothermal conversion to achieve water evaporation during use, which leads to low photothermal efficiency, and at the same time, due to factors such as large volume and heavy weight, it greatly limits their use. widely used

Patent CN111573780A discloses a hollow fiber photothermal membrane equipment and its preparation method and application, as well as water treatment equipment, mainly by inserting the two ends of the hollow fiber membrane into the support and passing through the surface of the support to realize However, the photothermal membrane equipment does not maximize the specific surface area of ​​the hollow fiber membrane, and both ends are inserted into the water body, so heat loss is inevitable

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