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Detection method for cross-linking degree of reverse osmosis membrane

A technology of reverse osmosis membrane and detection method, applied in the field of reverse osmosis membrane performance detection, can solve the problem of inability to accurately detect the cross-linking degree of reverse osmosis membrane, and achieve simple and easy sample pretreatment process, low equipment requirements, and practicality strong effect

Inactive Publication Date: 2012-01-18
TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the technical problem that the degree of cross-linking of commercialized reverse osmosis membranes cannot be accurately detected at present, and provides a method for detecting the degree of cross-linking of reverse osmosis membranes, and adopts an appropriate sample pretreatment method to eliminate surface modification of reverse osmosis membranes In order to detect the interference of the layer on the test results, the X-ray photoelectron spectrometer (XPS) was used to accurately detect the mole percentages of oxygen and nitrogen in the separation layer of the reverse osmosis membrane. The relationship between the content of oxygen and nitrogen elements when linking and linear crosslinking is used to calculate the degree of crosslinking of reverse osmosis membranes

Method used

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  • Detection method for cross-linking degree of reverse osmosis membrane
  • Detection method for cross-linking degree of reverse osmosis membrane
  • Detection method for cross-linking degree of reverse osmosis membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A 20mm×20mm low-pressure reverse osmosis membrane A is taken from the LP21 reverse osmosis membrane produced by Beijing Times Wharton Technology Co., Ltd.

[0036] Use tweezers to peel off the non-woven fabric layer of reverse osmosis membrane A, keep the separation layer and support layer, and paste it on the cover glass with the same size of 20mm×20mm with double-sided tape, so that the support layer faces On, place the separation layer in direct contact with the coverslip. In this way, it is ensured that in the process of washing and dissolving the supporting layer with an organic solvent, the organic solvent can directly contact with the supporting layer, so that the polysulfone supporting layer can be completely removed.

[0037] The coverslips were washed with distilled water and ethanol before use, and dried to remove surface-adhered pollutants. According to the difference in solubility between the separation layer and the support layer, select a suitable volati...

Embodiment 2

[0045] A 45mm×26mm ultra-low pressure reverse osmosis membrane B is taken from the ULP21 reverse osmosis membrane produced by Beijing Times Wharton Technology Co., Ltd.

[0046] Use tweezers to peel off the non-woven fabric layer of reverse osmosis membrane B, keep the separation layer and support layer, and paste it on the cover glass with the same size of 45mm×26mm with double-sided tape, so that the support layer faces On, place the separation layer in direct contact with the coverslip. In this way, it is ensured that in the process of washing and dissolving the supporting layer with an organic solvent, the organic solvent can directly contact with the supporting layer, so that the polysulfone supporting layer can be completely removed.

[0047] The coverslips were washed with distilled water and ethanol before use, and dried to remove surface-adhered pollutants. According to the difference in solubility between the separation layer and the support layer, select a suitable...

Embodiment 3

[0055] A pollution-resistant reverse osmosis membrane C of 25mm×75mm was taken, and the pollution-resistant reverse osmosis membrane C was taken from the FR11 reverse osmosis membrane produced by Beijing Times Wharton Technology Co., Ltd.

[0056] Use tweezers to peel off the non-woven fabric layer of reverse osmosis membrane C, keep the separation layer and support layer, and paste it on a glass slide with the same specification of 25mm×75mm with double-sided tape, so that the support layer faces On, place the separation layer in direct contact with the glass slide. In this way, it is ensured that in the process of washing and dissolving the supporting layer with an organic solvent, the organic solvent can directly contact with the supporting layer, so that the polysulfone supporting layer can be completely removed.

[0057] The coverslips were washed with distilled water and ethanol before use, and dried to remove surface-adhered pollutants. According to the difference in s...

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Abstract

The present invention discloses a detection method for cross-linking degree of a reverse osmosis membrane. According to the method, a non-woven fabric layer of a reverse osmosis membrane is completely stripped, a separation layer and a support layer are remained; the separation layer and the support layer are flatly pasted on a glass substrate, wherein the support layer is positioned on the surface, and the separation layer contacts with the glass substrate; according to the solubility difference between the separation layer and the support layer, a proper volatile organic solvent is selected to dissolve and remove the support layer; a treatment of vacuum drying is performed to remove the organic solvent in the separation layer; a X-ray photoelectron spectrometer is adopted for carrying out sputtering stripping for the surface of the separation layer; finally mole percentage contents of two elements comprising oxygen and nitrogen are exactly detected, and are substituted into a formula to calculate the cross-linking degree of the reverse osmosis membrane. According to the present invention, the cross-linking degree of the reverse osmosis membrane can be exactly detected; the influence on the detection result due to the polymer-modified layer on the surface of the reverse osmosis membrane is avoided; the method has characteristics of simple sample pretreatment process, low cost, strong operability and easy popularization; the technical blank in exact detection of the cross-linking degree of the reverse osmosis membrane with the surface modification layer is filled.

Description

technical field [0001] The invention relates to a method for detecting the performance of a reverse osmosis membrane, in particular to a method for detecting the crosslinking degree of the reverse osmosis membrane. Background technique [0002] Reverse osmosis membranes are widely used in seawater and brackish water desalination, water purification, biomedicine, chemical industry and other fields. The reverse osmosis membrane is usually composed of three layers of separation layer, support layer and non-woven fabric; the separation layer of the current commercialized reverse osmosis membrane is mainly composed of trimesoyl chloride (TMC) and m-phenylenediamine (MPDA) through interfacial polymerization In the obtained aromatic polyamide material, the supporting layer is usually a porous polysulfone material. The separation layer is the main functional layer of the reverse osmosis membrane, and its thickness is mostly around several hundred nanometers. The cross-linking degre...

Claims

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Application Information

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IPC IPC(8): G01N23/00G01N1/34
Inventor 李强潘献辉侯纯扬
Owner TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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