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Preparation method of mineralization modified thin layer composite forward osmosis membrane

A forward osmosis membrane, thin layer technology, applied in the field of membrane separation, can solve the problems of large pollution trend, low salt retention rate, small water flux and so on

Inactive Publication Date: 2018-04-27
CHANGJIANG RIVER SCI RES INST CHANGJIANG WATER RESOURCES COMMISSION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the very thin polyamide active layer, this thin-layer composite forward osmosis membrane has greatly improved the permeability and selectivity compared with the traditional cellulose acetate forward osmosis membrane, but there are still low water flux and salt Disadvantages such as low retention rate and high pollution tendency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A preparation method of a mineralized modified thin-layer composite forward osmosis membrane, comprising the steps of:

[0016] A thin-layer composite forward osmosis membrane containing a commercial polysulfone bottom membrane prepared by interfacial polymerization was placed in 0.05 mol / L BaCl 2 Soak in the solution for 60s, then rinse with ultrapure water repeatedly for 60s to remove the loosely adsorbed barium ions; then put the washed membrane into 0.05mol / L Na 2 SO 4 Soak in the solution for 60s, then rinse repeatedly with ultrapure water for 60s. Barium sulfate (BaSO 4 ) mineralized modified thin layer composite forward osmosis membrane. The surface contact angle, surface roughness, surface zeta potential, water flux, salt backmixing flux (lower salt backmixing flux indicates higher salt rejection rate) and anti-fouling ability of the mineralized modified membrane were measured, and compared with Comparison of unmodified pristine thin-layer composite films. ...

Embodiment 2

[0018] A preparation method of a mineralized modified thin-layer composite forward osmosis membrane, comprising the steps of:

[0019] A thin-layer composite forward osmosis membrane containing a commercial polysulfone bottom membrane prepared by interfacial polymerization was placed in 0.1 mol / L AgNO 3 Soak in the solution for 60s, then rinse repeatedly with ultrapure water for 60s to remove loosely adsorbed silver ions; then soak the rinsed membrane in 0.05mol / L NaCl solution for 60s, then rinse repeatedly with ultrapure water 60s. Thin-layer composite forward osmosis membranes modified by silver chloride (AgCl) mineralization were prepared by alternating immersion cycles for 4 times. The surface contact angle, surface roughness, surface zeta potential, water flux, salt backmixing flux, and antifouling ability of the mineralized modified membrane were measured and compared with the unmodified pristine thin-layer composite membrane. The measurement results are as follows: A...

Embodiment 3

[0021] A preparation method of a mineralized modified thin-layer composite forward osmosis membrane, comprising the steps of:

[0022] A thin-layer composite forward osmosis membrane containing a commercial polysulfone bottom membrane prepared by interfacial polymerization was placed in 0.1 mol / L AgNO 3 Soak in the solution for 60s, then rinse repeatedly with ultrapure water for 60s to remove loosely adsorbed silver ions; then soak the rinsed membrane in 0.05mol / L NaCl solution for 60s, then rinse repeatedly with ultrapure water 60s. Silver chloride (AgCl) mineralized modified thin-layer composite forward osmosis membrane was prepared by alternating immersion cycles for 6 times. The surface contact angle, surface roughness, surface zeta potential, water flux, salt backmixing flux, and antifouling ability of the mineralized modified membrane were measured and compared with the unmodified pristine thin-layer composite membrane. The measurement results are as follows: after the...

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Abstract

The invention discloses a preparation method of a mineralization modified thin layer composite forward osmosis membrane. The preparation method particularly includes the steps of: firstly, preparing apolyamide thin layer composite forward osmosis membrane through interface polymerization; and performing alternate immersion to perform mineralization modification so as to deposit a layer of mineralized substance on the surface of the polyamide active layer, thereby producing the mineralization modified thin layer composite forward osmosis membrane which is higher in water flux, higher in salt interception rate and stronger antifouling performance. The preparation method is simple. The membrane has great practical application prospect and commercial development value in various fields of water treatment.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a preparation method of a mineralized modified thin-layer composite forward osmosis membrane. Background technique [0002] With the development of human society, the increasing demand for fresh water resources and the increasingly serious water pollution problem, membrane separation technology is more and more widely used in water treatment process. As a new branch of membrane separation technology, forward osmosis has attracted extensive attention from researchers at home and abroad because of its low energy consumption, low pollution, and high environmental protection. It shows great potential in drug controlled release and osmotic power generation. However, forward osmosis technology still faces many challenges, one of which is the need for the development of the forward osmosis membrane itself. Finding an efficient and stable forward osmosis membran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D71/56B01D71/02B01D69/12B01D67/00B01D61/00
CPCB01D61/002B01D67/0079B01D69/12B01D71/02B01D71/56B01D71/68
Inventor 金海洋林莉于萍
Owner CHANGJIANG RIVER SCI RES INST CHANGJIANG WATER RESOURCES COMMISSION
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