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Asymmetric antioxidant permeable membrane and preparation method thereof

A permeable membrane, oxidation-resistant technology, applied in chemical instruments and methods, semi-permeable membrane separation, membrane technology, etc., can solve the problems of reducing water flux, reducing surface hydrophilicity, etc., to achieve stable operation and hydrophilization The effect of improved degree and simple operation

Inactive Publication Date: 2013-07-24
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the amino groups on the surface of the polyamide permeable membrane are easily oxidized to nitro groups and hydroxyl amino groups, which reduces the surface hydrophilicity, and the phenomenon of concentration polarization is obvious, which reduces the water flux.

Method used

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  • Asymmetric antioxidant permeable membrane and preparation method thereof
  • Asymmetric antioxidant permeable membrane and preparation method thereof
  • Asymmetric antioxidant permeable membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The NaCl aqueous solution with a concentration of 2M is used as the drawing solution, and the secondary water is used as the raw material solution to test the water flux and rejection rate of the sample as a forward osmosis membrane. First, the prepared hollow fiber permeable membrane was placed in a self-made detection device for forward osmosis test. At room temperature (23°C), a certain flow rate was adjusted and controlled to keep the water flow pressure at 0.1 MPa, and the positive osmosis test was performed using an AY220 electronic balance. The mass of feed solution consumed by the membrane. Measure the mass change every 1 minute, and calculate the water permeation per unit area and unit time of the forward osmosis membrane, which can reach a maximum of 40L / (m 2 h). The DDS-307 conductivity meter was used to test the concentration change before and after the draw solution, and the interception rate of the permeable membrane for salt ions was calculated. The per...

Embodiment 2

[0026] MgCl at a concentration of 2M 2 The aqueous solution is the drawing liquid, and the secondary water is used as the raw material liquid, and the test sample is used as the water flux and rejection rate of the forward osmosis membrane. Put the prepared hollow fiber forward osmosis membrane in a self-made detection device for forward osmosis test. At room temperature (23°C), adjust and control a certain flow rate to keep the water flow pressure at 0.1MPa, and use an electronic balance to test the forward osmosis membrane. The consumption quality of the raw material solution. Measure the mass change every 1 minute, and calculate the water permeation per unit area and unit time of the forward osmosis membrane, which can reach a maximum of 52L / (m 2 h). The DDS-307 conductivity meter was used to test the concentration change before and after the draw solution, and the interception rate of the permeable membrane for salt ions was calculated. Oxalic acid treated permeable mem...

Embodiment 3

[0028] A NaCl aqueous solution with a concentration of 0.6M was used to simulate seawater, and a pressure-damped osmosis (PRO) power generation system was constructed with river water as the infiltrate, and the water flux and rejection rate of the sample as a forward osmosis membrane were tested. First place the prepared hollow fiber permeable membrane in the PRO performance testing device. At room temperature (23°C), adjust the size of the valve to control a certain flow rate, and use an electronic balance to test the consumption quality of the raw material solution passing through the forward osmosis membrane. Measure the mass change every 1 minute, and calculate the water permeation per unit area and unit time of the forward osmosis membrane, which can reach a maximum of 100L / (m 2 h). Use the DDS-307 conductivity meter to test the concentration change in front of the draw solution, and calculate the interception rate of the permeable membrane for salt ions. The permeable m...

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Abstract

The invention discloses a preparation method of an asymmetric antioxidant polyamide permeable membrane. The method comprises the steps of: adopting p-phenylenediamine (MPD) and trimesoyl chloride (TMC) monomers, combining a polyamide surface layer on the surface of a polysulfone (PES) support membrane through an interfacial polycondensation way, and implementing posttreatment on the surface layer through oxalic acid cooperating with a dehydrating agent, thus preparing an antioxidant polyamide composite permeable membrane. The treatment method, which adopts the oxalic acid cooperating with the dehydrating agent, can effectively improve the oxidative resistance and the hydrophilicity of the polyamide surface layer, and the method, cooperating with an asymmetric membrane structure, can greatly reduce the influence of concentration polarization on membrane separating property, so as to further enhance the water flux of the membrane as well as the reject rate to salt ions. The initiative preparation method, which operates at normal temperature and under normal pressure, is simple in experimental condition and short in preparation cycle, and the method is specifically applicable to mass preparation of high-performance permeable separating membranes.

Description

field of invention [0001] The invention relates to an asymmetric oxidation-resistant polyamide permeable membrane and a preparation method thereof. technical background [0002] my country is a big country with severe water shortage, and the per capita water resource is only 1 / 4 of the world average. The shortage of water resources is becoming more and more serious, diverting the source of seawater and brackish water is an important way to solve the problem of water resources, and osmotic membrane separation technology will play an important role day by day. Polyamide permeable membrane has the characteristics of good hydrophilicity, large flux, and high ion rejection rate, and has good mechanical properties, thermal stability and hydrolytic stability. At present, the main applications of polyamide membranes include nanofiltration membranes (Nanofiltration, NF), reverse osmosis membranes (Reverse Osmosis, RO) and forward osmosis membranes (Forward Osmosis, FO). However, po...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D69/02B01D67/00
Inventor 贾奇博杨海军沈建权刘必前
Owner INST OF CHEM CHINESE ACAD OF SCI
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