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A method for preparing a new polyelectrolyte/metal organic framework compound mixed matrix nanofiltration membrane by layer-by-layer self-assembly method
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A metal-organic framework, polyelectrolyte technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as low permeation flux, achieve high permeation flux and increase processing efficiency.
Active Publication Date: 2020-04-28
HARBIN INST OF TECH AT WEIHAI +1
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[0005] The purpose of the present invention is to solve the characteristics of low permeation flux under the high rejection rate of existing commercial nanofiltration membranes, and to prepare high rejection rate and high flux composite nanofiltration membranes
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specific Embodiment approach 1
[0027] Embodiment 1: A method for preparing a novel polyelectrolyte / metal-organic framework compound mixed matrix nanofiltration membrane by layer-by-layer self-assembly method, which is realized according to the following steps:
[0028] The surface charge of the nanofiltration membrane prepared by the invention is adjustable, and the thickness of the selection layer is adjustable. The permeation flux of the prepared nanofiltration membrane is more than three times higher than that of the traditional nanofiltration membrane, and the water flux of the nanofiltration membrane is greatly increased.
Embodiment 1
[0030] A method for preparing a novel polyelectrolyte / metal organic framework compound mixed matrix nanofiltration membrane by layer-by-layer self-assembly method, which is realized according to the following steps:
[0031] 1. Add polysodium p-styrene sulfonate and UiO-66 capped polyelectrolyte into deionized water, and mix well to obtain a polyanion solution;
[0032] The concentration of sodium polystyrene sulfonate was 0.1 wt.%, and the concentration of UiO-66-terminated polyelectrolyte was 0.02 wt.%.
[0033] 2. Add branched polyethyleneimine to deionized water and mix uniformly to obtain a polycation solution with a branched polyethyleneimine concentration of 0.1wt.%.
[0034] 3. The commercial polyacrylonitrile base membrane (nanofiltration membrane) was treated with NaOH solution with a concentration of 10wt.% for 0.5 h, and then the surface of the membrane was cleaned with deionized water, and then with a concentration of 0.1 mol L -1 HCl solution was treated for 3 h...
Embodiment 2
[0042] A method for preparing a novel polyelectrolyte / metal organic framework compound mixed matrix nanofiltration membrane by layer-by-layer self-assembly method, which is realized according to the following steps:
[0043] 1. Add polysodium p-styrene sulfonate and UiO-66 capped polyelectrolyte into deionized water, and mix well to obtain a polyanion solution;
[0044] The concentration of sodium polystyrene sulfonate was 0.2 wt.%, and the concentration of UiO-66-terminated polyelectrolyte was 0.05 wt.%.
[0045] 2. Add polydimethyldiallyl ammonium chloride to deionized water, and mix uniformly to obtain a polycation solution whose concentration of polydimethyldiallylammonium chloride is 0.2wt.%.
[0046] 3. The commercial polyacrylonitrile base membrane (nanofiltration membrane) was treated with NaOH solution with a concentration of 10wt.% for 0.5 h, and then the surface of the membrane was cleaned with deionized water, and then with a concentration of 0.1 mol L -1 HCl solu...
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Abstract
The invention discloses a method for preparing a novel mixed matrix nanofiltration membrane of polyelectrolyte / a metal organic framework compound by using a layer-by-layer self-assembly method, and relates to the method for preparing the membrane. The method aims to solve the problem of low flux of a commercial nanofiltration membrane under a high retention rate during actual application. The method comprises the following steps: (1) sequentially treating a polyacrylonitrile base membrane with a NaOH solution and a HCl solution, and performing washing and soaking with deionized water; (2) thenputting the treated polyacrylonitrile base membrane in a polycation solution for assembly, and performing washing with water; (3), putting the assembled polyacrylonitrile base membrane in a polyanionsolution for assembly, and performing water washing; (4), repeating the steps of 2 and 3 multiple times; and (5) heating for cross-linking. The self-assembly technique is adopted to prepare the nanofiltration membrane, the characteristics of optional layer thickness and adjustable electric charges are achieved; and a water channel is prepared by introducing the polyelectrolyte which is terminatedby the water-soluble metal organic framework compound, so that the high-performance composite nanofiltration membrane is prepared.
Description
technical field [0001] The invention relates to a method for preparing a film. Background technique [0002] The nanofiltration process started in the mid-to-late 1980s and is a new pressure-driven physical separation process without phase change. The pore size of the nanofiltration membrane is larger than that of the ultrafiltration membrane but smaller than that of the reverse osmosis membrane. Therefore, when the nanofiltration membrane first came out, it was called a loose reverse osmosis membrane. The characteristic of nanofiltration membrane is that it has a high rejection rate for divalent and multivalent ions, and its molecular weight cut-off is between 200-1000 g∙mol -1 , while the rejection rate of monovalent ions is relatively low. Although the membrane separation process originated from water treatment, with the development of membrane separation technology, its application field is not limited to water treatment. Removal, material separation and purification ...
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