High-flux and high-selectivity nanofiltration membrane and preparation method thereof

A high-selectivity, nanofiltration membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as poor stability and decreased membrane retention performance, and achieve the effect of high permeation flux

Active Publication Date: 2019-09-06
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of macromolecules and composite materials, while interfering with the interfacial polymerization process, can easily cause defects in the cross-linked layer, resulting in poor stability of the prepared membrane and a general decline in membrane retention performance.

Method used

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  • High-flux and high-selectivity nanofiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preparation of aspartate-calcium metal (Asp-Ca) chelate:

[0037] Dissolve aspartic acid powder and anhydrous calcium chloride solid at a molar ratio of 2:1 in an aqueous solution with pH = 8, stir and react at 80°C for 1 hour, then concentrate under reduced pressure and suction to a sticky paste. The precipitate was washed 4 times with absolute ethanol. Finally, the precipitate was dried in a vacuum oven at 50 °C for 24 h for use.

[0038] Preparation of composite nanofiltration membrane:

[0039] Prepare an Asp-Ca aqueous solution with a mass concentration of 0.01w / v%, a 0.1w / v% PIP aqueous solution, and a 0.1w / v% TMC n-decane solution.

[0040] First, cut the polysulfone ultrafiltration base membrane with a molecular weight cut off of 5000 to an appropriate size, and place it on the mouth of the suction filter bottle (effective filtration area 20cm 2 ), pour 30mL of prepared Asp-Ca aqueous solution into the suction filter cup, that is, the suction filtration volum...

Embodiment 2

[0042] Preparation of Glu-Cu metal chelates:

[0043] Heat and dissolve L-glutamic acid powder and copper sulfate pentahydrate crystals with a molar ratio of 2:1 in an aqueous solution of pH=6, stir and react in a water bath at 85°C for 1 hour, cool the reaction solution, and filter under reduced pressure in batches , adding absolute ethanol to wash the precipitate for 4 times, taking the filter cake layer and drying it in an oven at 110°C to constant weight to obtain blue Glu-Cu crystals, which were stored in a vacuum desiccator.

[0044] Preparation of composite nanofiltration membrane:

[0045] Prepare an Asp-Ca aqueous solution with a mass concentration of 0.01w / v%, a 0.2w / v% PIP aqueous solution, and a 0.2w / v% TMC n-decane solution.

[0046] First, cut the polysulfone ultrafiltration base membrane with a molecular weight cut off of 5000 to an appropriate size, and place it on the mouth of the suction filter bottle (effective filtration area 20cm 2 ), pour 30mL of prepar...

Embodiment 3

[0048] Preparation of Glu-Cu metal chelate: same as Example 2.

[0049] Preparation of composite nanofiltration membrane:

[0050] The Glu-Cu aqueous solution with a mass concentration of 0.05w / v%, the PIP aqueous solution with 1.0w / v%, and the TMC n-decane solution with 0.2w / v% were prepared.

[0051] First, cut the polysulfone ultrafiltration base membrane with a molecular weight cut off of 10,000 to an appropriate size, and place it on the mouth of the suction filter bottle (effective filtration area 20cm 2 ), pour 10mL of the prepared Glu-Cu aqueous solution into the suction filter cup, that is, the suction filtration volume is 0.5mL / cm 2 (relative to the area of ​​the base membrane), vacuumize and filter the moisture under the condition of 0.02MPa (absolute pressure), and obtain a polysulfone base membrane with a layer of Glu-Cu deposited on the surface. Then soak it in the water phase solution for 10 minutes, remove excess water on the surface with filter paper after t...

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Abstract

The invention relates to a high-flux and high-selectivity nanofiltration membrane and a preparation method thereof. The nanofiltration membrane is a composite membrane comprising a polysulfone ultrafiltration base membrane, an ultrathin deposition layer and a polyamide layer, wherein the ultrathin deposition layer is formed by depositing an acidic amino acid-metal nano chelate on the surface of the polysulfone ultrafiltration base membrane. The preparation method comprises the steps that the acidic amino acid-metal nano chelate is prepared, the ultrathin deposition layer of the acidic amino acid-metal nano chelate is deposited on the polysulfone base membrane; the polyamide layer is formed on the ultrathin deposition layer, and post-crosslinking is carried out at the high temperature. Theprepared nanofiltration membrane has a high permeation flux, a good selectivity for monovalent and bivalent salt ions and a higher interception capacity for dye molecules, and can be applied to the fields of the dye industry in production, separation, dye wastewater treatment and the like.

Description

technical field [0001] The invention belongs to the technical field of water treatment membranes, and in particular relates to a high-throughput and high-selectivity nanofiltration membrane and a preparation method thereof. Background technique [0002] Membrane technology is called "the water treatment technology of the 21st century". It plays a significant role in ensuring drinking water safety and reducing environmental pollution. It has gradually exerted its technical advantages in chemical, energy, pharmaceutical, electronic and other industries. Compared with the traditional water treatment process, the membrane technology process does not produce difficult-to-treat sludge, has strong applicability, simple device, high separation efficiency, easy control, and low energy consumption, so it has attracted more and more attention. [0003] Nanofiltration is a membrane separation technology between reverse osmosis and ultrafiltration. It is usually prepared by interfacial p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D67/00B01D69/12B01D71/56B01D71/68C02F1/44C02F101/30
CPCB01D61/027B01D67/0006B01D69/12B01D71/56B01D71/68C02F1/442C02F2101/308
Inventor 范琳孔新赵伟国王世宇孙家宽
Owner WANHUA CHEM GRP CO LTD
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