Composite nanofiltration membrane and preparation method thereof

A technology of composite nanofiltration membrane and ultrafiltration membrane, which is applied in the field of preparation of nanofiltration membrane and nanofiltration membrane, can solve the problems of inability to realize water softening ability, uncontrollable separation layer thickness, large fluctuation of nanofiltration membrane performance, etc. Achieve the effect of low working pressure, low cost and simple process

Pending Publication Date: 2022-04-01
NINGBO FOTILE KITCHEN WARE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, on the one hand, the rejection efficiency of calcium ions is not high, so that efficient water softening ability cannot be achieved; have efficient heavy metal removal and vice versa
However, in some water usage scenarios, the removal rate of heavy metals must be highly efficient, which will inevitably lead to an increase in pressure and a decrease in flux, while the removal rate of hardness needs to fluctuate within a certain range, which leads to contradictions
In this way, the existing nanofiltration membranes cannot realize
[0004] In addition, the conventional interfacial polymerization method adopts the method of scraping or dipping, and the water phase and oil phase monomers are scraped or dipped on the support layer of the base film. In this process, a large amount of water phase monomers penetrate into the pores of the support layer. , so the interfacial polymerization reaction occurs through the diffusion of monomers in the pores and on the membrane surface, resulting in the uncontrollable thickness of the separation layer, and the performance of the prepared nanofiltration membrane fluctuates greatly
At the same time, due to the influence of the thickness of the separation layer, while achieving high retention, the flux still cannot meet the ideal requirements

Method used

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  • Composite nanofiltration membrane and preparation method thereof
  • Composite nanofiltration membrane and preparation method thereof
  • Composite nanofiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1. Preparation of heavy metal adsorption support layer

[0043]In terms of mass percentage, mix dried 10% polyethersulfone, 2% polyvinylpyrrolidone and 86% N,N-dimethylacetamide, heat to 60°C to dissolve and stir for about 6 hours, then add 1% Polyethyleneimine (10000) and 1% glycerol glycidyl ether were reacted at 60°C for 2 hours, and left to stand for 8 hours to remove the bubbles in the feed solution to prepare a film solution.

[0044] Ultrafiltration support layer: put the above membrane solution into the ultrafiltration membrane scraping equipment, adjust the parameters of the scraping membrane, and obtain an ultrafiltration support layer with a pore size of 10nm and a thickness of 200μm. Refer to the photomicrograph figure 1 .

[0045] 2. Electrostatic spray deposition film separation layer

[0046] Active monomer solution preparation

[0047] Dissolve 0.25% polyethyleneimine PEI 70000 in 99.75% deionized water and stir to make a uniform polyethyleneimine PEI...

Embodiment 2

[0064] 1. Preparation of heavy metal adsorption support layer

[0065] In terms of mass percentage, mix dried 10% polyethersulfone, 2% polyvinylpyrrolidone and 86% N,N-dimethylacetamide, heat to 60°C to dissolve and stir for about 6 hours, then add 1% Polyethyleneimine (10000) and 1% glycerol glycidyl ether were reacted at 60°C for 2 hours, and left to stand for 8 hours to remove the bubbles in the feed solution to prepare a film solution.

[0066] Nanofiber membrane support layer: put the above membrane solution into the electrospinning equipment, adjust the electrostatic parameters, the flow rate of the syringe pump is fixed at 50 μL / min, the distance between the needle and the collector is 10cm, and the applied voltage is 11KV. The rotating speed is 100rpm, and the dense nanofiber film is collected on the non-woven fabric, and the diameter of the nanofiber is between 150-450nm. Nanofiber Membrane Support Layer Photomicrograph Reference figure 2 .

[0067] 2. Electrostat...

Embodiment 3

[0077] 1. Preparation of heavy metal adsorption support layer

[0078] In terms of mass percentage, dissolve 16% polyvinylidene fluoride after drying in 71% N,N-dimethylacetamide and mix, heat to 60°C to dissolve and stir for about 6 hours, then add 10% polyethyleneimine (10000) and 3% glycerol glycidyl ether were reacted at 60°C for 2 hours, and left to stand for 8 hours to remove the bubbles in the feed solution to prepare a film solution.

[0079] Nanofiber membrane support layer: put the above membrane solution into the electrospinning equipment, adjust the electrostatic parameters, the flow rate of the syringe pump is fixed at 80 μL / min, the distance between the needle and the collector is 10cm, and the applied voltage is 19KV. The rotation speed was 100 rpm, and a dense nanofibrous film was collected on a non-woven fabric.

[0080] 1. Active monomer solution preparation

[0081] Dissolve 0.25% polyethyleneimine PEI 100000 in 99.75% deionized water and stir to make a un...

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Abstract

A composite nanofiltration membrane is characterized by comprising a heavy metal adsorption supporting layer and a cation separation layer which are stacked, the cation separation layer independently exists on the surface of the heavy metal adsorption supporting layer, and the heavy metal adsorption supporting layer is an ultrafiltration membrane or a nanofiber membrane prepared through electrostatic spinning. The cation separation layer is atomized into micro-nano liquid drops in an electrostatic spraying mode, and the micro-nano liquid drops react and deposit on the heavy metal adsorption supporting layer. The invention also discloses a preparation method of the composite nanofiltration membrane. The composite nanofiltration membrane disclosed by the invention has double-effect functions, and the problem of synchronism of removal rates of heavy metal ions and hardness ions by a traditional nanofiltration membrane is solved.

Description

technical field [0001] The invention relates to a water filtration membrane, in particular to a nanofiltration membrane, and also relates to a preparation method of the nanofiltration membrane. Background technique [0002] With the rapid development of industry and the increase of human activities, a large amount of heavy metals have caused heavy metals in water sources through man-made pollution sources such as mining, metal smelting, metal processing, and chemical production wastewater, combustion of fossil fuels, application of pesticides and fertilizers, and domestic waste. Ion pollution, and the amount of pollution continues to expand, and has endangered the lives of the people. At the same time, due to the high mineral content of hard water in domestic water supply or industrial applications, it can reduce the efficiency of household cleaning, cause scaling and corrosion problems, and cause serious failures in the piping of boilers, heat exchangers and appliances. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D67/00B01D69/12B01D71/34B01D71/42B01D71/68C02F1/44
Inventor 裴小强高婷婷郭国良郑军妹
Owner NINGBO FOTILE KITCHEN WARE CO LTD
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