Preparation method of nano material modified poly piperazine amide nanofiltration membrane

A polypiperazine amide and nanomaterial technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of small flux, low interception selectivity, poor anti-corrosion performance, etc., and improve mechanical strength. , Improve membrane permeation flux, good hydrophilic effect

Active Publication Date: 2014-06-25
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the disadvantages of low cut-off selectivity, small flux and poor anticorrosion performance of current organic nanofiltration membranes, in order to improve the surface charging performance of polypiperazine amide nanofiltration membranes and improve the resistance to monovalent salts and divalent salts. The cut-off selectivity, as well as the...

Method used

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  • Preparation method of nano material modified poly piperazine amide nanofiltration membrane
  • Preparation method of nano material modified poly piperazine amide nanofiltration membrane
  • Preparation method of nano material modified poly piperazine amide nanofiltration membrane

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Experimental program
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Embodiment 1

[0016] Configuration mass concentration is 0.2% trimesoyl chloride (TMC) organic phase solution, wherein solvent is IsoparG, adds 0.01% lipophilic nano-titanium dioxide; Configuration mass concentration is 0.2% piperazine aqueous solution, then adding mass concentration is 0.05% The conductive nano-polyaniline is dispersed evenly by ultrasonic, the polysulfone support membrane is immersed in the piperazine aqueous solution for 120 seconds, and then the polysulfone support membrane is rolled with a rubber roller to remove the excess solution; after the solution is dry, it is mixed with the organic phase solution Contact for 20 seconds; put the membrane into a vacuum oven at 80° C. for 12 minutes, and dry to obtain a modified nanofiltration composite membrane. Use 2000ppm sodium sulfate aqueous solution, magnesium chloride, sodium chloride aqueous solution to test the initial performance of the membrane under the pressure of 1MPa. 2 SO 4 and MgCl 2 The desalination rate is 97....

Embodiment 2

[0018] Configuration mass concentration is the trimesoyl chloride (TMC) organic phase solution of 0.2%, and wherein solvent is IsoparG; Configuration mass concentration is the piperazine aqueous solution of 0.2%, polysulfone support membrane is put into piperazine aqueous solution and soaked 120 seconds, Then roll the polysulfone support membrane with a rubber roller to remove excess solution; after the solution is dry, contact with the organic phase solution just after ultrasonic dispersion for 20 seconds; put the membrane in a vacuum oven at 80°C for 12 minutes, and dry it to prepare Obtain nanofiltration composite membrane and use 2000ppm sodium sulfate aqueous solution, magnesium chloride, sodium chloride aqueous solution to test the initial performance of the membrane under 1MPa pressure. 2 SO 4 and MgCl 2 The desalination rate is 89.2% and 66.7%, the removal rate of NaCl is 30.7%, and the flux is 35.6L / h / m 2 .

Embodiment 3-7

[0020] Change the addition amount of conductive nano-polyaniline (PANI) in the aqueous phase solution, and the other steps are the same as in Example 1 to prepare a composite film and test it. The results are shown in the following table:

[0021]

[0022]

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Abstract

The invention discloses a preparation method of a nano material modified poly piperazine amide nanofiltration membrane. The preparation method comprises the following steps: adding conducting nano polyaniline into a piperazine water solution, carrying out ultrasound processing so as to disperse the conducting nano polyaniline uniformly, and then contacting the dispersed conducting nano polyaniline with an organic solution containing trimesoyl chloride and lipophilicity nano titanium dioxide to generate interfacial polymerization reaction so as to obtain a modified composite nanofiltration membrane. The nanofiltration membrane prepared by the method is improved in the rejection rate of sodium sulfate and magnesium chloride to the maximum of 97.2% and 88.5%, is low in rejection rate (less than 30%) of sodium chloride, and shows high selectivity to univalent salt and divalent salt, and meanwhile, the permeation flux and the antiseptic property of a membrane sheet are improved to a certain extent; additionally, the surface of the prepared membrane is endowed with amidogens, imidogen active groups, amide bonds and nano particles, so that the nano material modified poly piperazine amide nanofiltration membrane has the characteristics of favorable hydrophilia, pollution resistance, electric conductivity, mechanical intensity and the like, and can be widely applied to the separation of multiple salts.

Description

Technical field: [0001] The invention relates to a preparation method of nanometer material modified polypiperazine amide nanofiltration membrane. Background technique: [0002] The rejection rate of nanofiltration membranes to divalent ions and solutes with a molecular weight greater than 200 is greater than 90%, while the rejection rate to monovalent ions and low molecular weight solutes is generally lower than 50%, so that the selective separation of substances can be achieved, so that in It is widely used in many fields such as pharmacy, biochemical industry, food, water treatment, etc., especially in the field of water treatment, mainly used in the following four aspects: (1) purification of drinking water; (2) pretreatment of seawater desalination; (3) industrial Wastewater treatment; (4) Domestic sewage treatment. Among them, the use of nanofiltration membranes as pretreatment for seawater desalination can solve the problem of fouling and pollution in the traditional...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D69/10B01D67/00
Inventor 周勇李洪懿翟丁高从堦
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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