Preparation method of positively charged polyamide/TiO2 ceramic hollow fiber composite nano-filtration membrane and nano-filtration membrane

A technology of fiber composite and polyamide, which is applied in the field of positively charged polyamide/TiO2 ceramic hollow fiber composite nanofiltration membrane and its preparation, can solve the problems of complex operation and high environmental requirements, and achieve simple preparation process, large flux, The effect of mild reaction conditions

Active Publication Date: 2018-09-21
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

AnaF.M.Pinheiro prepared a solvent-resistant nanofiltration membrane on a γ-Al2O3 base membrane with an average pore size of 5nm by grafting, which is complicated to operate and requires high environmental requirements

Method used

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  • Preparation method of positively charged polyamide/TiO2 ceramic hollow fiber composite nano-filtration membrane and nano-filtration membrane
  • Preparation method of positively charged polyamide/TiO2 ceramic hollow fiber composite nano-filtration membrane and nano-filtration membrane
  • Preparation method of positively charged polyamide/TiO2 ceramic hollow fiber composite nano-filtration membrane and nano-filtration membrane

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0042] (1) Preparation of the base film: Prepare the casting solution according to the ratio of polyethersulfone: polyvinylpyrrolidone: N-methylpyrrolidone: α-alumina = 1-20:0.1-8: 30-60:30-70, The hollow fiber membrane is spun by the phase inversion method, placed in a muffle furnace to program the temperature to 1000-1700°C, and kept for 1-6 hours to obtain a ceramic hollow fiber base membrane;

[0043] (2) Pretreatment of the base membrane: take the ceramic hollow fiber microfiltration membrane as the base membrane, soak it in 0.1-1.0mol / L sodium hydroxide solution for 5-10h, take it out and ultrasonically clean it several times, and place it in an oven at 50-70°C to completely dry the basement membrane;

[0044] (3) Surface modification of the base film: adding polyvinylpyrrolidone (2-8g / 100mL) and polyvinyl alcohol (0.1-2g / 100mL) to the titanium sol to adjust the viscosity of the sol. After immersing the pretreated ceramic base film in titanium sol, dry it at room temper...

Embodiment 1-5

[0046] Polyamide / TiO 2 Preparation of composite nanofiltration membrane:

[0047] The sol-modified basement membrane was immersed in the aqueous phase solution for 15s, and then the solution was removed. After being placed in the air for 30s, it was immersed in the organic phase solution for 20s for interfacial polymerization, and then the organic solution on the surface of the membrane was removed to obtain a nanofiltration membrane.

[0048] The content of polyethyleneimine in the aqueous phase is 0.3% (w / v), 0.6% (w / v), 0.9% (w / v), 1.2% (w / v), 1.5% (w / v ). The organic phase is 0.15% (w / v) trimesoyl chloride n-hexane solution.

[0049] The polyamide / TiO that embodiment 1-5 makes 2 The nanofiltration membrane was tested for water flux and salt rejection performance, and the test results are shown in Table 1

[0050] Embodiments 1-5 mainly consider the influence of the concentration of the aqueous phase on the performance of the nanofiltration membrane.

[0051]

Embodiment 6-9

[0053] Substantially the same as Example 3, keep the polyethyleneimine content in the water phase as 0.9% (w / v) constant, adjust the content of trimesoyl chloride in the organic phase, investigate the effect of trimesoyl chloride content on nanofiltration membrane performance influences.

[0054] The nanofiltration membrane prepared in Examples 6-9 was tested for water flux and salt interception performance, and the test results are as follows.

[0055]

[0056]

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Abstract

The invention relates to a preparation method of a positively charged polyamide / TiO2 ceramic hollow fiber composite nano-filtration membrane. The composite nano-filtration membrane comprises a supporting layer, a middle layer and a separation layer. The preparation method comprises the following steps that 1, a ceramic base membrane is prepared; 2, the base membrane is preprocessed; 3, titanium sol is prepared; 4, the base membrane is coated with the sol; 5, the sol is sintered; 6, an aqueous phase and an organic phase solution are prepared; 7, an interfacial polymerization reaction is conducted to obtain the final composite nano-filtration membrane. The invention further provides the nano-filtration membrane obtained through the method. The method has the advantages that the process is simple, the membrane separation performance is good, and the industrial practical application value is remarkable.

Description

technical field [0001] The invention belongs to the technical field of functional ceramic membranes, in particular to a positively charged polyamide / TiO2 ceramic hollow fiber composite nanofiltration membrane and a preparation method thereof. Background technique [0002] Nanofiltration is a pressure-driven membrane separation process that features high flux, low operating pressure, and low operating costs. As an emerging membrane separation technology, nanofiltration membranes are widely used in wastewater treatment, seawater desalination, drug separation and purification, and other fields. The molecular weight cut-off of the nanofiltration membrane is usually 200-1000Da, and its pore size is 0.5nm-2nm. [0003] The nanofiltration membrane mainly includes a support layer and a separation layer. According to different supports, nanofiltration membranes can be divided into organic nanofiltration membranes and inorganic nanofiltration membranes. Due to various types, mature...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/08B01D69/12B01D69/02
CPCB01D67/0079B01D69/02B01D69/08B01D69/12B01D69/125B01D2325/26
Inventor 许振良李宇璇王明曹悦
Owner EAST CHINA UNIV OF SCI & TECH
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