Preparation method of high-performance ZIF-8-containing nanofiltration membrane based on two-step addition of sodium polystyrene sulfonate

A technology of sodium polystyrene sulfonate and ZIF-8, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of membrane performance decline, poor dispersion, agglomeration, etc. Ease of the process

Inactive Publication Date: 2020-06-02
天津生态城水务投资建设有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if ZIF-8 particles are directly added to the water phase or oil phase of the interfacial polymerization reaction, serious agglomeration will occur, and the dispersion in the film will be poor, resulting in a decrease in film performance.

Method used

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  • Preparation method of high-performance ZIF-8-containing nanofiltration membrane based on two-step addition of sodium polystyrene sulfonate
  • Preparation method of high-performance ZIF-8-containing nanofiltration membrane based on two-step addition of sodium polystyrene sulfonate

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Using 30KDa polyacrylonitrile ultrafiltration flat membrane as the base membrane, fix the 10cm×10cm base membrane on the glass plate, and soak the upper surface in 50mL of 0.6% PSS aqueous solution, take it out after 20h, and remove the membrane with a rubber roller Excess water on the surface; soak the upper surface of the membrane in 50mL zinc nitrate solution with a concentration of 0.018mol / L, take it out after 20h, remove the excess water on the surface of the membrane with a rubber roller; soak the upper surface of the membrane in 50mL Hmim with a concentration of 0.28mol / L, PSS concentration of 0.6% in the mixed aqueous solution, take it out after 20h, wash it thoroughly with deionized water, and let it stand for 15min at 60℃; soak the upper surface of the membrane in 50mL of 2% PIP aqueous solution, and take it out after 2min , Use a rubber roller to remove excess water on the membrane surface; immerse the upper surface of the membrane in 50 mL of 0.2% TMC n-hexa...

Embodiment 2

[0031] Using 30KDa polyacrylonitrile ultrafiltration flat membrane as the base membrane, fix the 10cm×10cm base membrane on the glass plate, soak the upper surface of the membrane in 50mL zinc nitrate solution with a concentration of 0.018mol / L, and take it out after 20h. The rubber roller removes excess water on the surface of the membrane; soak the upper surface of the membrane in 50mL Hmim aqueous solution with a concentration of 0.28mol / L, take it out after 20h, wash it with deionized water, and let it stand at 60℃ for 15min; soak the upper surface of the membrane In 50mL of 2% concentration of PIP aqueous solution, take out after 2 minutes, remove excess water on the surface of the film with a rubber roller; soak the top surface of the film in 50mL of 0.2% concentration of TMC n-hexane solution, take out after 1 minute, at 65℃ The composite nanofiltration membrane containing ZIF-8 was prepared by heat treatment for 2 min. The performance of the membrane was tested with a c...

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Abstract

The invention discloses a preparation method of a high-performance ZIF-8-containing nanofiltration membrane based on two-step addition of sodium polystyrene sulfonate. The method comprises the following steps: (1) modifying an ultrafiltration base membrane by using a sodium polystyrene sulfonate (PSS) aqueous solution; (2) introducing an aqueous solution containing Zn<2+>; (3) introducing an aqueous solution containing 2-methylimidazole and PSS, preparing ZIF-8 by using an in-situ growth method, and adjusting the particle loading capacity; (4) introducing an aqueous solution containing piperazine (PIP); and (5) introducing an n-hexane solution containing trimesoyl chloride (TMC), and preparing a polyamide skin layer through interfacial polymerization. ZIF-8 is deposited on the surface of the base membrane through the in-situ growth method, the preparation method is simple and convenient, and industrial amplification is facilitated; in the step (1), anchoring of Zn<2+> on the surface ofthe base membrane is realized by using the PSS, and in the step (3), the deposition amount of ZIF-8 is increased by using the PSS, so that agglomeration of the ZIF-8 is avoided; and the polyamide nanofiltration membrane containing ZIF-8 prepared by the method shows high water flux and stable interception performance on divalent ions and dyes.

Description

Technical field [0001] The invention relates to a method for preparing a high-performance ZIF-8-containing nanofiltration membrane based on two-step addition of sodium polystyrene sulfonate, and belongs to the technical field of membrane material modification. Background technique [0002] With the rapid development of my country's economy and urbanization, on the one hand, the massive discharge of domestic sewage and industrial wastewater has caused the water pollution situation to become more and more severe. In recent years, membrane water treatment technology has developed rapidly. According to the pore size of the separation membrane, membrane technology can be divided into microfiltration, ultrafiltration, nanofiltration, and reverse osmosis. The pore size of the nanofiltration membrane is between the ultrafiltration membrane and the reverse osmosis membrane, which effectively retains divalent salts and can permeate monovalent salts. Nanofiltration has low driving pressure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D71/42B01D71/28B01D71/06B01D71/02B01D67/00B01D61/02
CPCB01D61/027B01D67/0002B01D71/022B01D71/06B01D71/28B01D71/42B01D71/68
Inventor 赵益华龙星丽张文茂陶君马同宇
Owner 天津生态城水务投资建设有限公司
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