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Method for preparing composite nanofiltration membrane by interfacial polymerization based on step-by-step spin-coating method

A composite nanofiltration membrane and interfacial polymerization technology, applied in the field of nanofiltration membranes, can solve problems such as shortage, achieve the effects of improving utilization rate, simplifying steps, and reducing reaction time

Pending Publication Date: 2021-09-28
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] There is a lack of technology on the market that combines spin coating technology with interfacial polymerization technology for the production of composite nanofiltration membranes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The present invention a kind of method based on interfacial polymerization of step-by-step spin coating method to prepare composite nanofiltration membrane, comprises the following steps:

[0030] a. the ratio of preparation m-phenylenediamine, hyperbranched polyethyleneimine and water is 0g: 2g: 98g aqueous phase solution, and the ratio of preparation trimesoyl chloride and n-hexane is 1g: 99g organic phase solution;

[0031] b. Place the commercialized polyvinylidene fluoride (PVDF) microporous filter membrane on the spin-coating apparatus plate support, set the rotation speed of the spin-coating apparatus to run at a constant speed of 2000r / min, and drop 1mL of the aqueous phase solution to the polyvinyl Vinylidene fluoride-based film center, and continue to spin for 40s until the aqueous solution is evenly spin-coated;

[0032] c. Then add 1mL of the organic phase solution dropwise to the center of the polyvinylidene fluoride base film at a constant speed within 10s...

Embodiment 2

[0040] Compared with embodiment 1, this embodiment differs in that:

[0041] The rotational speed of the spin coater in step b of Example 1 was adjusted to 4000r / min, and the rest of the process parameters were the same as in Example 1. The separation performance (methylene blue / ethanol mixed solution) of the prepared composite membrane was evaluated using the same nanofiltration test device, test conditions and methods as in Example 1. The results show that the permeate flux of the membrane is 3.6Lm -2 h -1 bar -1 , The rejection rate of methylene blue is 95.4%.

Embodiment 3

[0043] Compared with embodiment 1, this embodiment differs in that:

[0044] The ratio of m-phenylenediamine, hyperbranched polyethyleneimine and water in step a of Example 1 is adjusted to 1.6g: 0.4g: 98g, and the ratio of trimesoyl chloride to n-hexane is adjusted to 0.5g: 99.5g, All the other processing parameters are with embodiment 1. The separation performance (methylene blue / ethanol mixed solution) of the prepared composite membrane was evaluated using the same nanofiltration test device, test conditions and methods as in Example 1. The results show that the permeate flux of the membrane is 2.7Lm -2 h -1 bar -1 , The rejection rate of methylene blue is 98.8%.

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Abstract

The invention discloses a method for preparing a composite nanofiltration membrane by interfacial polymerization based on a step-by-step spin-coating method. According to the method, a polyvinylidene fluoride microporous filter membrane is used as a base membrane, and an interfacial polymerization reaction is conducted on a water phase containing a polyamine monomer and an organic phase containing a polyacyl chloride monomer under the condition of step-by-step spin-coating to prepare a polyamide separation layer; and the method has the characteristics of high repeatability and simple preparation process. The polyamide composite nanofiltration membrane prepared by using the method has an excellent separation effect on organic solutions (or aqueous solutions) containing various dyes (or drugs) such as methylene blue, Congo red, acid red 94, solvent red, brilliant blue R, amaranth red, rhodamine B, vitamin B12 and the like.

Description

technical field [0001] The invention belongs to the technical field of nanofiltration membranes, in particular to a method for preparing composite nanofiltration membranes by interfacial polymerization based on a step-by-step spin coating method. Background technique [0002] In recent years, membrane separation technology has gained widespread attention in the fields of organic solvent recovery, drug purification, and saline wastewater treatment due to its advantages of simple operation, high separation efficiency, low investment, and low maintenance cost. Among them, nanofiltration is a new pressure-driven membrane separation technology developed since the 1980s, and has practical applications in solvent treatment and chemical industry. [0003] The composite nanofiltration membrane is composed of a porous support layer and an ultra-thin separation layer. Compared with the overall asymmetric membrane, its design freedom is greater, and the pore structure and thickness of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00C02F1/44C02F101/30C02F101/34C02F101/36C02F101/38
CPCB01D69/12B01D67/0006C02F1/442C02F2101/308C02F2101/34C02F2101/36C02F2101/38C02F2101/40
Inventor 花丹潘俊扬郑大渊许庆清吴之涛詹国武
Owner HUAQIAO UNIVERSITY
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