Portable photo-thermal seawater desalination hollow fiber membrane, preparation method, device and application

Abstract

The invention discloses a portable photo-thermal seawater desalination hollow fiber membrane, a preparation method, a device and application. The preparation method comprises the following steps: 1) dispersing and dissolving a hydrophilic polymer and nano-particles in a buffer solution with the pH value of 8.5 to prepare a uniform solution, circularly washing the hollow fiber membrane with the uniform solution for 1-24 hours, and conducting cleaning and drying for later use to prepare the hollow fiber membrane with the super-hydrophilic inner surface, wherein the ratio of the hydrophilic polymer to the nano-particles is (1-20):(0-20); and (2) putting the hollow fiber membrane with the super-hydrophilic inner surface obtained in the step (1) in 0.1-20wt% photo-thermal modified material solution atmosphere, and conducting treating for 1-24 hours in manners of surface adsorption, surface vapor deposition, surface cross-linking fixation, suction filtration and / or coating modification, so as to prepare the hollow fiber membrane with the super-hydrophilic inner surface and the photo-thermal outer surface. The three-dimensional hollow fiber membrane is selected as a base material, and the photo-thermal seawater desalination hollow fiber membrane obtained through inner / outer surface modification can realize photo-thermal 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 its preparation method, device and application. Background technique [0002] Fresh water is one of the basic materials for the survival and development of human society. However, it only exists in rivers, lakes and underground fresh water that can be directly used by humans, which is less than 0.36%. my country has a long coastline, and some islands, coastal saline-alkaline areas, and inland brackish water areas are areas that lack fresh water. People have various diseases due to long-term drinking of water that does not meet hygienic standards, which directly affects their health and local economic construction. Therefore, desalination of seawater and brackish water has become an effective way to expand freshwater sources. [0003] At present, there are many methods for desalination of seaw...

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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