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...

Examples

Embodiment 1

[0064] Firstly, Example 1 provides a preparation method of hollow fiber membranes for photothermal seawater desalination: using superfiber membranes with an average pore size of 0.9 μm, a porosity of 60%, a membrane thickness of 200 μm, and inner / outer diameters of 0.5 mm / 1.0 mm respectively. The hydrophilic polysulfone hollow fiber gradient membrane is used as the polymer base membrane, and the 0.5wt% carbon nanotube dispersion is fixed on the outer surface of the hollow fiber membrane through surface adsorption by vacuum filtration technology for 1 hour, so that the outer surface has photothermal function The black appearance hollow fiber membrane of the first layer can be obtained after washing and drying the hollow fiber membrane for photothermal seawater desalination.

[0065] The polymer hollow fiber membrane modified by carbon nanotubes has excellent self-siphon performance, and the appearance is uniform black. Secondly, this embodiment 1 also provides a portable photot...

Embodiment 2

[0067] First, Example 2 provides a method for preparing a hollow fiber membrane for photothermal seawater desalination: Step 1: adopt an average pore diameter of 2 μm, a porosity of 80%, a membrane thickness of 50 μm, and an inner / outer diameter of 0.1 mm / 0.25 mm The hydrophobic polyethylene hollow fiber membrane is a polymer base membrane, and dopamine and polyethyleneimine are dispersed and dissolved in a buffer solution with a pH of 8.5 to form a uniform solution, wherein the ratio of dopamine: polyethyleneimine is 1:1; The surface coating technology was treated for 12 hours to fix the homogeneous solution on the inner surface of the hollow fiber membrane, and then cleaned and dried for later use;

[0068] Step 2: Put the polymer base membrane treated in step 1 in a 2wt% polypyrrole solution to modify the outer surface by vapor deposition for 3 hours to obtain a hollow fiber membrane with a black appearance and a photothermal functional layer on the outer surface. After clea...

Embodiment 3

[0072] Firstly, Example 3 provides a method for preparing hollow fiber membranes for photothermal seawater desalination: using ultra-thin membranes with an average pore size of 1.0 μm, a porosity of 40%, a membrane thickness of 200 μm, and inner / outer diameters of 2.0 mm / 3.5 mm, respectively. The hydrophilic polyethersulfone hollow fiber membrane is a polymer base membrane, and the superhydrophilic polyethersulfone hollow fiber membrane is placed in a 20wt% polyaniline solution for cross-linking and fixing modification of the outer surface for 6 hours, and the outer surface has a light The black appearance hollow fiber membrane of the thermal functional layer can be washed and dried to obtain the hollow fiber membrane for photothermal seawater desalination. The polyaniline-modified polymer hollow fiber membrane prepared in Example 3 has excellent self-siphon performance, and its appearance is uniform black.

[0073]Secondly, this embodiment 3 also provides a portable photother...

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...

Examples

Embodiment 1

[0064] Firstly, Example 1 provides a preparation method of hollow fiber membranes for photothermal seawater desalination: using superfiber membranes with an average pore size of 0.9 μm, a porosity of 60%, a membrane thickness of 200 μm, and inner / outer diameters of 0.5 mm / 1.0 mm respectively. The hydrophilic polysulfone hollow fiber gradient membrane is used as the polymer base membrane, and the 0.5wt% carbon nanotube dispersion is fixed on the outer surface of the hollow fiber membrane through surface adsorption by vacuum filtration technology for 1 hour, so that the outer surface has photothermal function The black appearance hollow fiber membrane of the first layer can be obtained after washing and drying the hollow fiber membrane for photothermal seawater desalination.

[0065] The polymer hollow fiber membrane modified by carbon nanotubes has excellent self-siphon performance, and the appearance is uniform black. Secondly, this embodiment 1 also provides a portable photot...

Embodiment 2

[0067] First, Example 2 provides a method for preparing a hollow fiber membrane for photothermal seawater desalination: Step 1: adopt an average pore diameter of 2 μm, a porosity of 80%, a membrane thickness of 50 μm, and an inner / outer diameter of 0.1 mm / 0.25 mm The hydrophobic polyethylene hollow fiber membrane is a polymer base membrane, and dopamine and polyethyleneimine are dispersed and dissolved in a buffer solution with a pH of 8.5 to form a uniform solution, wherein the ratio of dopamine: polyethyleneimine is 1:1; The surface coating technology was treated for 12 hours to fix the homogeneous solution on the inner surface of the hollow fiber membrane, and then cleaned and dried for later use;

[0068] Step 2: Put the polymer base membrane treated in step 1 in a 2wt% polypyrrole solution to modify the outer surface by vapor deposition for 3 hours to obtain a hollow fiber membrane with a black appearance and a photothermal functional layer on the outer surface. After clea...

Embodiment 3

[0072] Firstly, Example 3 provides a method for preparing hollow fiber membranes for photothermal seawater desalination: using ultra-thin membranes with an average pore size of 1.0 μm, a porosity of 40%, a membrane thickness of 200 μm, and inner / outer diameters of 2.0 mm / 3.5 mm, respectively. The hydrophilic polyethersulfone hollow fiber membrane is a polymer base membrane, and the superhydrophilic polyethersulfone hollow fiber membrane is placed in a 20wt% polyaniline solution for cross-linking and fixing modification of the outer surface for 6 hours, and the outer surface has a light The black appearance hollow fiber membrane of the thermal functional layer can be washed and dried to obtain the hollow fiber membrane for photothermal seawater desalination. The polyaniline-modified polymer hollow fiber membrane prepared in Example 3 has excellent self-siphon performance, and its appearance is uniform black.

[0073]Secondly, this embodiment 3 also provides a portable photother...

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