Hydrophilic and hydrophobic interpenetrating network nanofiber, forward osmosis membrane and preparation method

An interpenetrating network, forward osmosis membrane technology, applied in the field of high flux forward osmosis membrane, can solve the problems of internal concentration polarization, high cost, hydrophilicity, poor permeability, etc., and achieve the reduction of internal concentration polarization , The effect of enhanced chlorine resistance and increased water flux

Active Publication Date: 2016-01-06
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to meet the market demand and overcome the common problems of the existing high-flux forward osmosis membrane support layer, such as poor hydrophilicity, poor permeability, and serious internal concentration polarization, As well as the disadvantages of complex membrane preparation process and high cost, the present invention provides a method for preparing a hydrophilic-hydrophobic interpenetrating network composite nanofiber, and provides a high-flux forward osmosis membrane using the fiber as a support layer and a preparation method thereof

Method used

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  • Hydrophilic and hydrophobic interpenetrating network nanofiber, forward osmosis membrane and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Dissolve 10g of PET in 90ml of trifluoroacetic acid to prepare a 10wt% PET solution; dissolve 1g of polyvinyl alcohol (PVA) in 9ml of deionized water to obtain a 10wt% uniform solution of PVA. The two solutions were added to different syringes, the mass ratio of PET solution and PVA solution in the syringe was 4 / 1, the injection speed was 10.5μl / min, the distance between the syringe and the metal rotating drum was 15cm, and under the DC voltage of 15KV, the hydrophilic and hydrophobic Composite nanofibers were received up to 0.5m 2 On a metal rotating drum, the composite nanofibers were rinsed with deionized water for 30 minutes, then dried in a vacuum oven at 30°C for 5 hours, and finally stored in a desiccator for use.

[0048] Prepare 3.4wt% MPD / water solution, 0.1wt% TMC / n-hexane solution, soak the composite nanofiber support layer in the MPD solution for 5 minutes, drain the excess water on the surface of the support layer after taking it out, and then soak it in t...

Embodiment 2

[0051] Dissolve 10g of PET in 40ml of trifluoroacetic acid to prepare a 20wt% PET solution; dissolve 1g of PVA in 9ml of deionized water to obtain a 10wt% uniform solution of PVA. The two solutions were added to different syringes. The mass ratio of PET solution to PVA solution in the syringe was 3 / 1, the injection speed was 10.5μl / min, the distance between the syringe and the metal rotating drum was 15cm, and the hydrophilic and hydrophobic Composite nanofibers were received up to 0.5m 2 On a metal rotating drum, the composite nanofibers were rinsed with deionized water for 30 minutes, then dried in a vacuum oven at 30°C for 5 hours, and finally stored in a desiccator for use.

[0052] Prepare 3.4wt% MPD / water solution, 0.1wt% TMC / n-hexane solution, soak the composite nanofiber support layer in the MPD solution for 5 minutes, drain the excess water on the surface of the support layer after taking it out, and then soak it in the TMC solution for 30s , so that the two monomers...

Embodiment 3

[0055] Dissolve 1g of PET in 4ml of trifluoroacetic acid to prepare a 20wt% PET solution; dissolve 15g of PVA in 85ml of deionized water to obtain a 15wt% uniform solution of PVA. The two solutions were added to different syringes. The mass ratio of PET solution to PVA solution in the syringe was 1 / 4, the injection speed was 10.5μl / min, and the distance between the syringe and the metal rotating drum was 15cm. Under the DC voltage of 15KV, the hydrophilic and hydrophobic Composite nanofibers were received up to 0.5m 2 On a metal rotating drum, the composite nanofibers were rinsed with deionized water for 30 minutes, then dried in a vacuum oven at 30°C for 5 hours, and finally stored in a desiccator for use.

[0056] Prepare 3.4wt% MPD / water solution, 0.1wt% TMC / n-hexane solution, soak the composite nanofiber support layer in the MPD solution for 5 minutes, drain the excess water on the surface of the support layer after taking it out, and then soak it in the TMC solution for 3...

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Abstract

The invention relates to a preparation method for a hydrophilic and hydrophobic interpenetrating polymer network nanofiber, a forward osmosis membrane taking the nanofiber as a supporting layer, and a preparation method for the forward osmosis membrane, belonging to the technical field of membranes. The preparation method for hydrophilic and hydrophobic interpenetrating polymer network nanofiber forward osmosis membrane comprises the steps: preparing hydrophobic polymer melt or solution and hydrophilic polymer melt or solution, then respectively pouring the two melts or solutions into different injectors or electrostatic spinning tubes, electrically spinning the two melts or solutions into hydrophilic and hydrophobic interpenetrating polymer network nanofiber by utilizing electrostatic spinning equipment; and then polymerizing a thin desalting skin layer on the hydrophilic and hydrophobic interpenetrating polymer network nanofiber supporting layer by adopting an interfacial polymerization technology, thus preparing a high-throughput hydrophilic and hydrophobic interpenetrating polymer network nanofiber forward osmosis membrane. According to the prepared forward osmosis membrane, the water flux is obviously improved, the chlorine resistance is enhanced, and the internal concentration polarization is reduced.

Description

technical field [0001] The invention relates to a high-flux forward osmosis membrane, in particular to a method for preparing a hydrophilic-hydrophobic interpenetrating network nanofiber, a forward osmosis membrane with the nanofiber as a support layer and a preparation method thereof. It belongs to the field of membrane technology. Background technique [0002] As an emerging technology with low energy consumption, low pollution and high rejection rate, forward osmosis (FO) has attracted widespread attention of researchers in recent years. Forward osmosis technology has potential application value in seawater / brackish water desalination, sewage recycling, food processing, power generation and other fields. In recent years, many people have devoted themselves to the development and research of forward osmosis membranes. At present, the only commercialized forward osmosis membranes are cellulose triacetate membranes developed by HTI Company of the United States, which are as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/10B01D69/12B01D67/00D01D5/00D01D5/28
Inventor 任以伟田恩玲周欢王兴祖李静
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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