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A preparation method and application of a polyelectrolyte-coated nanofiltration composite membrane for treating electroplating wastewater

A polyelectrolyte and composite membrane technology, which is applied in the fields of metallurgical wastewater treatment, water/sewage treatment, chemical instruments and methods, etc., to achieve the effects of strong controllability, mild conditions and good pollution resistance

Active Publication Date: 2022-04-05
宁波日新恒力科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the water quality of electroplating wastewater from different enterprises varies greatly, common heavy metal ion pollutants include chromium, copper, nickel, zinc, gold, silver and lead, etc. In addition, wastewater also contains acid, alkali pollutants and a certain amount of organic matter

Method used

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  • A preparation method and application of a polyelectrolyte-coated nanofiltration composite membrane for treating electroplating wastewater

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Experimental program
Comparison scheme
Effect test

preparation example Construction

[0071] The invention provides a preparation method of a nanofiltration composite membrane, comprising the following steps:

[0072] 1) After mixing the polyacrylonitrile and the first solvent, an intermediate film liquid is obtained, and then the intermediate film liquid is coated on the base film to obtain a carrier compounded with the intermediate film;

[0073] 2) After mixing polyethyleneimine, poly(2-hydroxylactone methacrylate), vinylpyrrolidone and the second solvent again, a cross-linked composite film liquid is obtained, and then the cross-linked composite film liquid is coated on the above steps On the intermediate film of the obtained carrier, after cross-linking by electron beam irradiation, solidification is performed to obtain a nanofiltration membrane carrier;

[0074] 3) The nanofiltration membrane carrier obtained in the above steps is immersed in a poly(4-styrenesulfonic acid) ammonium salt solution, taken out and then immersed in a polydimethyldiallyl ammoni...

Embodiment 1

[0125]To prepare an intermediate transition support layer, put 100 g of organic polyacrylonitrile into 900 g of N,N-dimethylformamide, stir to dissolve, and degassing to obtain an intermediate transition support layer membrane liquid. The interlayer film liquid is quantitatively coated on the non-woven fabric, and the solvent is evaporated to form the interlayer. 80 g of polyethyleneimine, 20 g of poly(4-styrenesulfonamide) ammonium salt and vinylpyrrolidone (1%) were dissolved in N,N-dimethylformamide to form a colloidal raw material, which was defoamed to obtain a composite layer film liquid. The composite layer film liquid was quantitatively coated on the intermediate layer, and the cross-linking dose was 60kGy using electron beam irradiation. The crosslinked membrane was immersed in pure water to solidify. The polyelectrolyte poly(4-styrenesulfonic acid) ammonium salt was dissolved in pure water to prepare a 0.2 wt% poly(4-styrenesulfonic acid) ammonium salt solution with...

Embodiment 2

[0131] To prepare an intermediate transition support layer, put 100 g of organic polyacrylonitrile into 900 g of N,N-dimethylformamide, stir to dissolve, and degassing to obtain an intermediate transition support layer membrane liquid. The interlayer film liquid is quantitatively coated on the non-woven fabric, and the solvent is evaporated to form the interlayer. 75 g of polyethyleneimine, 25 g of poly(4-styrenesulfonamide) ammonium salt and vinylpyrrolidone (1%) were dissolved in N,N-dimethylformamide to form a colloidal raw material, which was defoamed to obtain a composite layer film liquid. The composite layer film solution was quantitatively coated on the intermediate layer, and the cross-linking dose was 70kGy using electron beam irradiation. The crosslinked membrane was immersed in pure water to solidify. The polyelectrolyte poly(4-styrenesulfonic acid) ammonium salt was dissolved in pure water to prepare a 0.4 wt% poly(4-styrenesulfonic acid) ammonium salt solution w...

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Abstract

The invention provides a preparation method of a nanofiltration composite membrane, comprising the following steps: firstly, after mixing polyacrylonitrile and a first solvent, an intermediate membrane liquid is obtained, and then the intermediate membrane liquid is coated on a base membrane to obtain a composite organic The carrier of the intermediate film; then polyethyleneimine, poly(methacrylic acid-2-hydroxylactone), vinylpyrrolidone and the second solvent are mixed again to obtain a cross-linked composite membrane solution, and then the cross-linked composite membrane solution is coated Cover on the intermediate membrane of the carrier obtained in the above steps, after cross-linking by electron beam irradiation, solidify to obtain the nanofiltration membrane carrier; finally, immerse the nanofiltration membrane carrier obtained in the above steps into poly(4-styrenesulfonate)ammonium After being taken out of the saline solution, it is immersed in polydimethyldiallylammonium chloride solution again, and then cross-linked again by electron beam irradiation to obtain a nanofiltration composite membrane.

Description

technical field [0001] The invention belongs to the technical field of electroplating wastewater treatment, and relates to a preparation method and application of a nanofiltration composite membrane, in particular to a preparation method and application of a polyelectrolyte-coated nanofiltration composite membrane for treating electroplating wastewater. Background technique [0002] The sources of electroplating wastewater are generally: (1) cleaning water for plating parts; (2) waste electroplating solution; (3) other wastewater, including scouring workshop floor, scrubbing plate washing water, ventilation equipment condensation water, and leakage due to plating tank leakage Or various tank liquids and drainage of "running, running, dripping and leaking" caused by improper operation and management; (4) Equipment cooling water, the cooling water is not polluted except for the temperature rise during use. The quality and quantity of electroplating wastewater are related to th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/66B01D71/64B01D71/42B01D71/38B01D69/12B01D61/02C02F1/44C02F101/20C02F101/22C02F103/16
CPCB01D71/42B01D71/64B01D71/38B01D71/66B01D69/125B01D61/027C02F1/442B01D2325/26C02F2103/16C02F2101/22C02F2101/20
Inventor 不公告发明人
Owner 宁波日新恒力科技有限公司