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Method for preparing nanofiltration membrane by electrostatic spraying and product thereof

An electrostatic spraying, nanofiltration membrane technology, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of low utilization rate of reactants, complex preparation process, and large amount of production, and achieve controllable thickness of separation layer and process. Simple and controllable, smooth surface effect

Active Publication Date: 2018-06-26
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems in the prior art that the preparation process of nanofiltration membranes is complicated, a large amount of waste liquid is produced, and the utilization rate of reactants is low, the present invention proposes a new method for preparing nanofiltration membranes by electrostatically spraying reactive small molecular substances, which can be achieved in one step. The nanofiltration membrane is prepared, which is simple and easy, and at the same time realizes zero discharge of waste liquid in the preparation process

Method used

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  • Method for preparing nanofiltration membrane by electrostatic spraying and product thereof
  • Method for preparing nanofiltration membrane by electrostatic spraying and product thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Fix the 5cm×5cm polyvinyl chloride ultrafiltration membrane on the receiving roller of the electrostatic spraying equipment;

[0028] (2) N, N-bicine buffer solution with a molar concentration of 10 mM and a pH of 8.5 is configured;

[0029] (3) Dissolving 20 mg of pyrogallol in 10 mL of the N,N-bishydroxyethylglycine solution obtained in step (2);

[0030] (4) Put the solution obtained in step (3) into a syringe, and install it on an electrostatic spraying equipment for electrostatic spraying to form a film. The electrostatic spraying parameters are as follows: nozzle diameter 0.7mm, voltage 10kV, receiving distance 10cm, propulsion speed 1mL / h, The speed of lateral movement (left and right movement) of the spraying equipment is 100mm / min, the speed of the receiving roller is 80rpm, the temperature of the spraying environment is 30°C, the humidity of the spraying environment is 30%, and the spraying time is 5h;

[0031](5) Remove the sprayed film from the receivin...

Embodiment 2

[0034] (1) Fix the 5cm×5cm polyvinylidene fluoride ultrafiltration membrane on the receiving roller of the electrostatic spraying equipment;

[0035] (2) configuration molar concentration is 20mM, and pH is 7.5 trimethylolaminopropanesulfonic acid;

[0036] (3) Dissolving 10 mg of catechin in 10 mL of trimethylolaminopropanesulfonic acid solution obtained in step (2);

[0037] (4) Put the solution obtained in step (3) into a syringe, and install it on an electrostatic spraying equipment for electrostatic spraying to form a film. The electrostatic spraying parameters are as follows: nozzle diameter 0.7mm, voltage 8kV, receiving distance 10cm, advance speed 0.8mL / h , the speed of lateral movement (left and right movement) of the spraying equipment is 100mm / min, the speed of the receiving roller is 80rpm, the temperature of the spraying environment is 30°C, the humidity of the spraying environment is 30%, and the spraying time is 8h;

[0038] (5) Remove the sprayed film from the...

Embodiment 3

[0041] (1) Fix the 5cm×5cm polyethersulfone ultrafiltration membrane on the receiving roller of the electrostatic spraying equipment;

[0042] (2) configuration molar concentration is 10mM, pH is the Tris of 9.5;

[0043] (3) 20 mg of dopamine was dissolved in 10 mL of tris solution obtained in step (2);

[0044] (4) Put the solution obtained in step (3) into a syringe, and install it on an electrostatic spraying equipment for electrostatic spraying to form a film. The electrostatic spraying parameters are as follows: nozzle diameter 0.7mm, voltage 7kV, receiving distance 10cm, advancing speed 0.7mL / h , the lateral movement (left and right movement) speed of the spraying equipment is 100mm / min, the speed of the receiving roller is 80rpm, the spraying ambient temperature is 30°C, the spraying ambient humidity is 30%, and the spraying time is 10h;

[0045] (5) Remove the sprayed film from the receiving roll to obtain the nanofiltration membrane.

[0046] The thickness of the s...

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Abstract

The present invention provides a method for preparing a nanofiltration membrane by electrostatic spraying. The method is characterized by comprising step 1) of dissolving a pH buffering agent in waterto obtain a pH buffer solution, and adjusting the pH to 7.5 to 9.5; step 2) of dissolving reactive small molecules in the solution obtained in the step 1), and preparing a spray liquid; wherein the reactive small molecules are one or more of tannic acid, pyrogallol, catechol, catechin, 1, 2, 4-pyrogallol, epigallocatechin gallate, epigallocatechin and dopamine hydrochloride; step 3) of electrostatically spraying the solution obtained in step 2) onto a polymer ultrafiltration membrane wrapping a receiving roller of a device, and obtaining the nanofiltration membrane by removal. The nanofiltration membrane can be prepare by the one-step method, the method is simple and easy to implement, and zero discharge of waste liquid is achieved in the preparation process.

Description

【Technical field】 [0001] The invention belongs to the field of preparation of nanofiltration membranes, in particular to a method for preparing nanofiltration membranes by electrostatically spraying reactive small molecules and a product thereof. 【Background technique】 [0002] Nanofiltration is a water treatment technology between ultrafiltration and reverse osmosis. It is currently widely used in industrial wastewater treatment, food industry, biomedicine and other fields to separate, purify or concentrate the waste liquid to be treated. The preparation of nanofiltration membranes originated in the 1970s, mainly referring to separation membranes with a pore size of about 1-5nm and a molecular weight cut-off of 200-1000 Daltons. Nanofiltration membranes are effective for small molecular organic substances (such as organic dye molecules, antibiotics, endocrine disruptors, and pesticides) and high-valent metal ions (Mg 2+ , Ca 2+ and Fe 3+ etc.) etc. have high interception...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D67/00B01D69/02B01D71/28B01D71/30B01D71/34B01D71/42B01D71/68C02F1/44
CPCB01D61/027B01D67/0002B01D69/02B01D71/28B01D71/30B01D71/34B01D71/42B01D71/68B01D2323/26B01D2325/14B01D2325/36C02F1/442
Inventor 王建强刘富
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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