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Preparation method of blended modified polysulfone charged nanofiltration membrane and obtained membrane

A blending modification and nanofiltration membrane technology, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as secondary pollution, harsh modification process, and poor stability of the modified layer, and achieve Avoid poor stability, strong tolerance, good stability

Active Publication Date: 2020-06-26
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past decades of research, interfacial polymerization, in-situ growth and secondary growth are all commonly used preparation methods, but the nanofiltration membrane prepared by interfacial polymerization has a smaller pore size and better retention efficiency, but the water flux is low The shortcomings of high pressure, high energy consumption, etc. greatly limit its large-scale industrial application; although the methods of in-situ growth and secondary growth can achieve high interception filtration and water flux, the modification process is relatively harsh and difficult to apply Large-scale production, the poor stability of the modified layer can easily cause secondary pollution, and this series of problems are not suitable for large-scale industrial wastewater treatment

Method used

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  • Preparation method of blended modified polysulfone charged nanofiltration membrane and obtained membrane
  • Preparation method of blended modified polysulfone charged nanofiltration membrane and obtained membrane
  • Preparation method of blended modified polysulfone charged nanofiltration membrane and obtained membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Prepare a modified nanofiltration membrane 1 according to the following steps:

[0043] (1) UiO-66-NH 2 preparation of

[0044] Use an analytical balance to weigh 0.125g of zirconium chloride and place it in a 100mL round-bottomed flask, add 5mL of N,N-dimethylformamide and 1mL of concentrated hydrochloric acid with a pipette gun, and place the round-bottomed flask in an ultrasonic cleaner for ultrasonic cleaning. until the solid is completely dissolved. Then add accurately weighed 0.136g of 2-aminoterephthalic acid and 10mL of N,N-dimethylformamide, and sonicate again to dissolve the solid. Put the rotor into the round-bottom flask, stir in an 80°C oil bath for 5 hours, then take it out and centrifuge, wash the precipitate with methanol, repeat three times, and then dry it in an oven. Put the dried sample into a 100mL beaker, add 80mL acetone and let it soak for 72h, and replace the acetone solution every 12h to realize the activation of UiO-66.

[0045] (2) UiO-66...

Embodiment 2

[0051] Prepare a modified nanofiltration membrane 3 according to the following steps:

[0052] (1) UiO-66-NH 2 preparation of

[0053] Use an analytical balance to weigh 0.125g of zirconium chloride and place it in a 100mL round-bottomed flask, add 5mL of N,N-dimethylformamide and 1mL of concentrated hydrochloric acid with a pipette gun, and place the round-bottomed flask in an ultrasonic cleaner for ultrasonic cleaning. until the solid is completely dissolved. Then add accurately weighed 0.136g of 2-aminoterephthalic acid and 10mL of N,N-dimethylformamide, and sonicate again to dissolve the solid. Put the rotor into the round-bottom flask, stir in an 80°C oil bath for 5 hours, then take it out and centrifuge, wash the precipitate with methanol, repeat three times, and then dry it in an oven. Put the dried sample into a 100mL beaker, add 80mL acetone and let it soak for 72h, and replace the acetone solution every 12h to realize the activation of UiO-66.

[0054] (2) UiO-66...

Embodiment 3

[0073] Prepare a modified nanofiltration membrane 2 according to the following steps:

[0074] (1) UiO-66-NH 2 preparation of

[0075] Use an analytical balance to weigh 0.125g of zirconium chloride and place it in a 100mL round-bottomed flask, add 5mL of N,N-dimethylformamide and 1mL of concentrated hydrochloric acid with a pipette gun, and place the round-bottomed flask in an ultrasonic cleaner for ultrasonic cleaning. until the solid is completely dissolved. Then add accurately weighed 0.136g of 2-aminoterephthalic acid and 10mL of N,N-dimethylformamide, and sonicate again to dissolve the solid. Put the rotor into the round-bottom flask, stir in an 80°C oil bath for 5 hours, then take it out and centrifuge, wash the precipitate with methanol, repeat three times, and then dry it in an oven. Put the dried sample into a 100mL beaker, add 80mL acetone and let it soak for 72h, and replace the acetone solution every 12h to realize the activation of UiO-66.

[0076] (2) UiO-66...

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Abstract

The invention provides a preparation method of a blended modified polysulfone charged nanofiltration membrane and the obtained membrane. The preparation method comprises the following steps: under acidic conditions, by taking zirconium chloride and 2-aminoterephthalic acid as raw materials, preparing UiO-66-NH2 and UiO-66-NH<3><+> powder, and preparing a selective machine-made membrane by adoptinga blending method. The technical scheme provided by the invention is adopted, according to the preparation method of the blended modified polysulfone charged nanofiltration membrane, the UiO-66-NH2 and UiO-66-NH<3><+> powder is prepared, and the modified nanofiltration membrane is prepared by adopting a blending method, so that the water flux and the rejection rate of the membrane are improved, and meanwhile, the nanofiltration membrane is endowed with the characteristic of selectively intercepting positive and negative charges. According to the technical scheme, the technology is simple, operation is easy and convenient, no high temperature or high pressure exists in the whole process, and meanwhile the problem that a membrane surface self-assembly modification method is poor in stability can be effectively solved. The nanofiltration membrane prepared in the invention has good stability, also has the function of selectively intercepting and recovering dye, can rapidly separate dye wastewater under low pressure and high concentration, and has very strong tolerance to organic reagents.

Description

technical field [0001] The invention relates to the technical field of water treatment membranes, in particular to a preparation method of a blended modified polysulfone charged nanofiltration membrane and the obtained membrane. Background technique [0002] Among the many printing and dyeing wastewater treatment processes, the emerging nanofiltration (NF) membrane process, because of its remarkable ability to selectively separate one solute from another and avoid limiting the osmotic pressure of monovalent ions, has become a A forward-looking technology that can efficiently treat dyes in industrial wastewater. At the same time, the appropriate nanofiltration membrane pore size and charge can further selectively concentrate the dye, realize the recycling of the dye, and conform to the policy of sustainable development. [0003] However, the relatively low separation efficiency is a serious problem that limits the large-scale application of NF membrane separation technology ...

Claims

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Application Information

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IPC IPC(8): B01D71/76B01D71/68B01D71/34B01D71/16B01D67/00B01D61/02C02F1/44C02F101/30
CPCB01D71/76B01D71/68B01D71/34B01D71/16B01D67/0011B01D61/027C02F1/442C02F2101/308
Inventor 孟祥民张明月王新萍刘毅宋晓明陈夫山张笑银
Owner QINGDAO UNIV OF SCI & TECH
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