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Piperazinyl primary positively-charged nanofiltration membrane and preparation method thereof

A technology of positively charged and nanofiltration membranes, which is applied in the field of piperazine-based positively charged nanofiltration membranes and their preparation, can solve the problems of low rejection rate of divalent metal cations and high surface electronegativity, and avoid surface modification. Sexual technology, high degree of cross-linking, effect of eliminating interference

Active Publication Date: 2022-08-09
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above problems, strengthen the cross-interface diffusion of piperazine monomer in the interfacial polymerization process, and realize the enhanced control of the diffusion process of piperazine monomer to the organic phase in the interfacial polymerization process, the present invention provides a piperazine-based primary charge Positive nanofiltration membrane and its preparation method, and solve the problem of low rejection rate of divalent metal cations such as Ca2+ and Mg2+ caused by the high surface electronegativity of the existing nanofiltration membrane

Method used

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Examples

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Embodiment 1

[0033] A preparation method of a piperazine-based primary positively charged nanofiltration membrane, the specific steps are as follows:

[0034] (1) piperazine, sodium lauryl sulfate and xylene are added to water, stirred at high speed to form the piperazine aqueous phase solution containing xylene emulsification droplets, piperazine mass concentration is 0.25%, and surfactant mass concentration is 0.05%, and the volume concentration of xylene is 2.0%;

[0035] (2) Tannic acid and ferric chloride solution water were used to obtain a tannic acid-iron modified solution, wherein the mass fraction of tannic acid was 0.4% and the mass fraction of ferric chloride was 0.1%, and the polysulfone ultrafiltration support membrane was immersed Surface hydrophilic modification is carried out in the modification solution for 10 minutes, then the modified support layer is immersed in the water phase of step (1), soaked for 2 minutes, and taken out;

[0036] (3) dissolving trimesoyl chloride ...

Embodiment 2

[0052] A preparation method of a piperazine-based primary positively charged nanofiltration membrane, the specific steps are as follows:

[0053] (1) piperazine, sodium dodecylbenzenesulfonate and xylene are added to water, stirred at high speed to form the piperazine aqueous phase solution containing xylene emulsification droplets, piperazine mass concentration is 0.01%, and surfactant The mass concentration is 0.01%, and the volume concentration of xylene is 0.5%;

[0054] (2) Tannic acid and ferric chloride solution water were used to obtain a tannic acid-iron modified solution, wherein the mass fraction of tannic acid was 0.4% and the mass fraction of ferric chloride was 0.1%, and the polyethersulfone ultrafiltration supporting membrane was Immerse in the modification solution for surface hydrophilic modification for 10 minutes, then immerse the modified support layer in the water phase described in step (1), soak for 2 minutes, and take out;

[0055] (3) dissolving trime...

Embodiment 3

[0061] A preparation method of a piperazine-based primary positively charged nanofiltration membrane, the specific steps are as follows:

[0062] (1) piperazine, hexadecyl trimethyl ammonium bromide and xylene are added to water, stirred at high speed to form a piperazine aqueous phase solution containing xylene emulsification droplets, the piperazine mass concentration is 2.0%, and the surface The mass concentration of active agent is 1.0%, and the volume concentration of xylene is 5.0%;

[0063] (2) Dissolving dopamine hydrochloride and polyethyleneimine in water to obtain a dopamine modified solution, wherein the mass fraction of dopamine hydrochloride and polyethyleneimine are both 0.2%, and immersing the polyimide ultrafiltration support membrane in the modified solution The surface is hydrophilically modified in the solution for 30 minutes, and then the modified support layer is immersed in the water phase described in step (1), soaked for 1 min, and taken out;

[0064]...

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Abstract

The invention relates to the technical field of water treatment membrane materials, in particular to a piperazinyl primary positively-charged nanofiltration membrane and a preparation method thereof. According to the nanofiltration membrane, a continuous water phase layer is constructed between a base membrane and an oil phase by utilizing an infiltration effect, a surfactant is added to reduce two-phase interface resistance, a weak-polarity solvent adopted by a traditional oil phase is changed into a xylene solvent, and cross-interface transfer of xylene microemulsion in a water phase is utilized to reinforce delivery of a piperazine monomer, so that the two-phase interface resistance is reduced. According to the preparation method disclosed by the invention, the process of diffusion of piperazine molecules to an organic phase in an interfacial polymerization process is intensified and regulated, a complicated surface modification technology adopted by preparation of a traditional positively charged nanofiltration membrane is avoided, and compared with a polyethyleneimine positively charged nanofiltration membrane, the nanofiltration membrane provided by the invention adopts a piperazine small-molecular monomer, retains the advantages of a piperazine-based nanofiltration membrane, and has a good application prospect. A large number of '-NH-' groups are distributed on the surface, the surface shows the positively charged property, and the water softening agent can be widely applied to the fields of water softening processes for removing divalent cations such as Ca < 2 + > and Mg < 2 + >.

Description

technical field [0001] The invention relates to the technical field of water treatment membrane materials, in particular to a piperazine-based primary positively charged nanofiltration membrane and a preparation method thereof. Background technique [0002] Membrane separation technology has the advantages of low energy consumption, low cost and easy industrialization, and is widely used in industrial production and daily life. Commonly used membrane types are divided into microfiltration, ultrafiltration, nanofiltration, reverse osmosis, etc. Ultra / microfiltration can effectively remove bacteria, viruses and protein pollutants in water, but the retention effect of small molecular organic pollutants such as salt, heavy metal ions and antibiotics is limited. Reverse osmosis can remove all ions and small molecules dissolved in water to obtain high-purity water, but in order to obtain larger water flux, reverse osmosis usually requires higher pressure. Nanofiltration membrane...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/02B01D67/00B01D69/10B01D71/82
CPCB01D69/02B01D67/0002B01D67/0006B01D69/10B01D69/105B01D71/82B01D2325/26Y02A20/131
Inventor 侯影飞蒋驰张萌萌王明
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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