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A method for preparing high-performance nanofiltration membranes by constructing a zif-8 intermediate layer

A technology of ZIF-8 and intermediate layer, which is applied in the field of membrane material modification, can solve the problem of low flux of nanofiltration membranes, and achieve the effects of uniform structure, high flux and retention capacity, and effective retention capacity

Active Publication Date: 2021-12-21
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the defect of low flux of existing nanofiltration membranes, provide a method for preparing high-performance nanofiltration membranes by constructing ZIF-8 intermediate layers, and adjust the polyamide separation layer by constructing ZIF-8 intermediate layers structure to realize the preparation of high-performance polyamide nanofiltration membrane

Method used

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  • A method for preparing high-performance nanofiltration membranes by constructing a zif-8 intermediate layer
  • A method for preparing high-performance nanofiltration membranes by constructing a zif-8 intermediate layer

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Using polyethersulfone microfiltration membrane as the supporting base membrane, pour an aqueous solution containing 0.1mol / L zinc nitrate and 1wt% sodium polystyrene sulfonate on the surface of the supporting base membrane, pour off the excess liquid after contacting for 12 hours, and remove the surface of residual liquid. Subsequently, the n-hexane / 1-octanol solution with a volume ratio of 9:1 containing 0.8 wt% dimethylimidazole was poured on the surface of the membrane. Rinse membrane. The membrane was annealed at 60°C for 30 minutes. After cooling to room temperature, an aqueous solution containing 2.0 wt% piperazine was poured on the surface of the membrane. After contacting for 2 minutes, the excess solution was poured off and the remaining liquid on the surface was removed. The n-hexane solution containing 0.2wt% trimesoyl chloride was poured onto the surface of the diaphragm, and after contacting for 1 min, the excess solution was poured off. The obtained fil...

Embodiment 2

[0037]Using the polyethersulfone microfiltration membrane as the supporting base membrane, pour an aqueous solution containing 0.2mol / L zinc nitrate and 0.5wt% sodium polystyrene sulfonate on the surface of the supporting base membrane, pour off the excess liquid after contacting for 8 hours, and remove residual liquid on the surface. Subsequently, the n-hexane / 1-octanol solution containing 1.0wt% dimethylimidazole in a volume ratio of 8:2 was poured on the surface of the membrane. Rinse membrane. The membrane was annealed at 60°C for 30 minutes. After cooling to room temperature, an aqueous solution containing 1.0 wt% piperazine was poured on the surface of the membrane. After contacting for 2 minutes, the excess solution was poured off and the remaining liquid on the surface was removed. The n-hexane solution containing 0.1 wt% trimesoyl chloride was poured onto the surface of the diaphragm, and after contacting for 1 min, the excess solution was poured off. The obtained f...

Embodiment 3

[0040] With the polysulfone microfiltration membrane as the supporting base membrane, pour the aqueous solution containing 0.05mol / L zinc nitrate and 2wt% sodium polystyrene sulfonate on the surface of the supporting base membrane, pour off the excess liquid after contacting for 5 hours, and remove the surface Residual liquid. Subsequently, the n-hexane / 1-octanol solution with a volume ratio of 7:3 containing 1.2 wt% dimethylimidazole was poured on the surface of the membrane. After contacting for 15 minutes, the excess organic solution was poured off. Rinse membrane. The membrane was thermally annealed at 70°C for 15 minutes. After cooling to room temperature, an aqueous solution containing 5wt% piperazine was poured on the surface of the membrane. After contacting for 5 minutes, the excess solution was poured off and the remaining liquid on the surface was removed. The n-hexane solution containing 0.5 wt% trimesoyl chloride was poured onto the surface of the diaphragm, and ...

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Abstract

The invention discloses a method for preparing a high-performance nanofiltration composite membrane by constructing a ZIF-8 intermediate layer. The method comprises: 1) preparing a ZIF-8 intermediate layer on a porous base membrane through a water / oil interface synthesis method; 2) preparing a polyamide separation layer on the ZIF-8 layer through an interfacial polymerization method. The ZIF-8 intermediate layer prepared by the water / oil interface synthesis method has the characteristics of uniform structure, small thickness and low agglomeration; 2+ A certain concentration of sodium polystyrene sulfonate is added to the water phase to effectively stabilize the ZIF-8 formation interface, thereby obtaining a ZIF-8 intermediate layer with continuous and uniform structural properties. The polyamide separation layer formed on this basis has a small thickness and no defects, so the prepared nanofiltration membrane has high flux and effective dianion and dye retention capacity. In the present invention, the water / oil interface synthesis process used to construct the ZIF-8 intermediate layer is similar to the interface polymerization process used to prepare the polyamide layer, which is convenient to improve on the basis of the traditional polyamide nanofiltration composite membrane preparation process. Scale up preparative production.

Description

technical field [0001] The invention belongs to the technical field of membrane material modification, and specifically relates to a method for preparing a high-performance nanofiltration membrane by constructing a ZIF-8 intermediate layer with high flux and effective dianion and dye interception capacity. Background technique [0002] The shortage of water resources and the increasing pollution of water bodies urgently require advanced technologies to produce clean water sustainably, economically and efficiently. Among them, membrane separation technology has been successfully used in water treatment because of its good treatment effect and wide application range. Among them, nanofiltration is a membrane separation technology driven by pressure. The pore size of nanofiltration membrane is about several nanometers, which can effectively remove divalent and multivalent ions and various substances with molecular weight greater than 200. Its separation performance is better tha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/00B01D69/12B01D71/56B01D67/00C02F1/44
CPCB01D61/027B01D69/12B01D71/56B01D67/0006C02F1/442
Inventor 王亮赵斌王虹利钱怡冉马聪张朝晖李君敬
Owner TIANJIN POLYTECHNIC UNIV
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