A kind of preparation method of layer by layer self-assembled metal-organic framework composite film
A metal-organic framework, layer-by-layer self-assembly technology, applied in the field of water treatment, can solve the problems of non-adjustable pore size, many impurities, poor compatibility, etc.
Active Publication Date: 2018-09-07
SHANDONG UNIV
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These unique characteristics make it possible to load the membrane material as a modified layer, thereby improving the performance of the membrane. Due to its unique structure and properties, nanomaterials are expected to endow the separation membrane with new performance. It has a nanoscale pore structure and a larger Specific surface area and other advantages, but the existing nanomaterials are difficult to combine stably with membrane materials, the compatibility is poor, and there are many impurities, and the pore size cannot be adjusted.
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[0006] Technical scheme of the present invention is as follows:
[0007] A method for preparing a layer-by-layer self-assembled metal-organic framework composite film, comprising the following steps:
[0008] (1) Synthesis of ZIF-8
[0009] 1) Zn(NO 3 ) 2 ·6H 2 O dissolved in methanol, Zn(NO 3 ) 2 ·6H 2 The mass volume ratio of O to methanol is: (0.6-1.0): 50, unit g / mL; the methanol solution of zinc nitrate is obtained,
[0010] 2) Dissolving 2-methylimidazole in methanol, the mass volume ratio of methylimidazole to methanol is: (0.6-1.0):50, unit g / mL; to obtain a methanol solution of methylimidazole;
[0011] 3) Pour the methanol solution of methylimidazole obtained in step 2) into the methanol solution of zinc nitrate, the volume ratio of the methanol solution of methylimidazole and the methanol solution of zinc nitrate is (1-2:(1-2) ), let stand for 24-36h, the precipitate is centrifuged, washed, dried and recovered under vacuum, then dissolved in methanol to form...
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Abstract
The invention relates to a preparation method of a layer-by-layer self-assembly metal-organic framework composite film. Polyethyleneimine (PEI) with positive charges, a methanol solution containing ZIF-8 and polyacrylic acid (PAA) with negative charges deposit on the surface of a polyether sulfone (PES) film layer by layer, ZIF-8 is wrapped in PEI and PAA through the electrostatic repulsion effect of the opposite charges, and a layer structure is formed on the surface of the PES film. By preparing the methanol solution containing ZIF-8, through the layer-by-layer self-assembly technology, ZIF-8 is successfully loaded on the surface of the PES film, the loading capacity of the PES film is maximized, and the composite film material with high permeation flux under no permselectivity compromise is successfully prepared.
Description
technical field [0001] The invention relates to a preparation method of a layer-by-layer self-assembled metal-organic framework composite membrane, which belongs to the technical field of water treatment. Background technique [0002] With the increasing scarcity of water resources and the increasing demand for water, membrane technology has become the most promising reclaimed water reuse technology at present, due to its simple device, no phase change in the separation process, high efficiency, low energy Secondary pollution and other advantages, widely used in the field of water purification. [0003] In the application process of membrane separation technology, it is of great significance to develop membranes with good chemical stability, high flux, corrosion resistance and anti-pollution performance. Metal-organic framework (MOF) is a porous network structure material formed by self-assembly of metal ions and organic ligands through supernetwork molecules. Since differe...
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IPC IPC(8): B01D71/68B01D69/12B01D67/00
CPCB01D67/0002B01D69/12B01D71/68B01D2323/46
Inventor 孙雪菲王琳王曙光
Owner SHANDONG UNIV