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A kind of composite polyamide membrane with salt concentration responsiveness and preparation method and use thereof
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A composite polyamide membrane and polyamide membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve high-efficiency separation and high separation efficiency
Active Publication Date: 2021-08-03
SICHUAN UNIV
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[0004] The composite polyamide membrane involved in the present invention exhibits salt concentration responsiveness, and its water flux will increase with the increase of salt concentration in the filtrate, which has never been reported
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Embodiment 1
[0028] Composite polyamide membranes were prepared as follows:
[0029] 1. Fix the asymmetric polysulfone ultrafiltration membrane (used as a support layer) on a glass plate and a Teflon frame, then pour the aqueous phase monomer solution into the Teflon frame, and soak the support layer for 1-10 minutes;
[0030] 2. Pour off the aqueous monomer solution, and use high-pressure gas to dry the surface moisture of the support layer (or use a rubber roller to remove moisture). Then pour the oil phase monomer solution into the surface of the support layer, and the interfacial polymerization reaction takes 30-600s;
[0031] 3. Pour off the oil phase monomer solution, and store the prepared composite polyamide membrane in distilled water at 4°C.
[0032] Wherein, the aqueous phase monomer solution may be an aqueous solution of L-lysine; the oil phase monomer solution may be an n-hexane solution (0.1 wt%) of trimesoyl chloride. All samples are represented by L-x in this example, whe...
Embodiment 2
[0037] Composite polyamide membranes were prepared as follows:
[0038] 1. Fix the asymmetric polysulfone ultrafiltration membrane (used as a support layer) on a glass plate and a Teflon frame, then pour the aqueous phase monomer solution into the Teflon frame, and soak the support layer for 1-10 minutes;
[0039] 2. Pour off the aqueous monomer solution, and use high-pressure gas to dry the surface moisture of the support layer (or use a rubber roller to remove moisture). Then pour the oil phase monomer solution into the surface of the support layer, and the interfacial polymerization reaction takes 30-600s;
[0040] 3. Pour off the oil phase monomer solution, rinse the surface with n-hexane and dry it, then immediately add the surface grafting aqueous solution to react for 1-10min. The prepared composite polyamide membrane was stored in distilled water at 4°C.
[0041] Wherein, the water phase monomer solution can be the aqueous solution (2wt%) of MPD or PIP; The oil phase m...
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Abstract
The invention provides a composite polyamide membrane with salt concentration responsiveness, a preparation method and application thereof, and belongs to the technical field of composite membrane preparation. The composite membrane of the present invention is prepared by the following method: (1) the support layer is fixed in the glass plate and the Teflon frame, then the aqueous monomer solution is poured into the Teflon frame, and the support layer is soaked for 1-10min; ( 2) Pour off the water-phase monomer solution, remove the moisture on the surface of the support layer, then pour the oil-phase monomer solution into the surface of the support layer, and perform the interfacial polymerization reaction for 30-600 s; (3) pour out the oil-phase monomer solution, so that the The prepared composite polyamide membrane was stored in distilled water at 4°C. The composite polyamide membrane obtained by the invention has a unique salt concentration response characteristic, and its water flux increases with the increase of the salt concentration in the raw material liquid. It can efficiently separate small organic molecules such as salts and dyes in the raw material liquid, and has a very high separation efficiency.
Description
technical field [0001] The invention belongs to the technical field of membrane material preparation, and specifically relates to a composite polyamide membrane with salt concentration responsiveness and its preparation method and application. This type of composite polyamide membrane has a unique salt concentration response characteristic, and its water flux will decrease. With the change of the salt concentration in the raw material solution, it shows obvious changes. Background technique [0002] The technology of interfacial polymerization to prepare polyamide selective membranes was invented by Caddote in 1972, and the polyamide membranes prepared by this method were named polyamide thin-film composite membranes, namely polyamide composite membranes. It consists of a non-woven fabric back layer, a polymer porous support layer (such as a polysulfone porous support layer prepared by a phase separation method) and a polyamide selective layer. The implementation method of ...
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