Polyethersulfone temperature-sensing catalytic membrane and preparation method and application thereof

A technology of polyethersulfone membrane and catalytic membrane, applied in the field of temperature-sensitive catalytic membrane, can solve the problems of low utilization rate of catalyst, low catalytic rate of catalytic membrane, small catalytic space, etc., so as to improve wastewater treatment efficiency, efficient and intelligent catalytic process, The effect of high pollutant conversion rates

Active Publication Date: 2018-09-04
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(1) metal ions are adsorbed onto the membrane carrier, and then adding a reducing agent such as sodium borohydride to reduce the metal ions to metal simple substances. The catalytic membrane catalyst prepared by this method has poor stability, because the catalyst particles are only fixed on the membrane surface. The utilization rate of the catalyst is low, resulting in a low catalytic rate of the catalytic membrane prepared by this method
(2) In situ reduction of metal ions to the carrier. Patra et al. prepared an anion exchange membrane for in situ reduction of silver particles. In the model reaction, when the molar ratio of sodium borohydride to p-nitrophenol was 100:1, The reaction rate is 0.6min -1 (See S.Patra, A.N.Naik, A.K.Pan...

Method used

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  • Polyethersulfone temperature-sensing catalytic membrane and preparation method and application thereof
  • Polyethersulfone temperature-sensing catalytic membrane and preparation method and application thereof
  • Polyethersulfone temperature-sensing catalytic membrane and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] In this example, the preparation method of the polyethersulfone temperature-sensitive catalytic membrane is as follows:

[0045] (1) Take N-isopropylacrylamide as monomer, N,N-methylenebisacrylamide as crosslinking agent, and potassium persulfate as initiator, add the above substances and deionized water into a flat-bottomed flask and stir evenly , pass through nitrogen to remove oxygen for about 20 minutes, seal the single-necked flask, and react at 70°C for 4 hours under stirring, filter the resulting reaction solution to remove agglomerated microspheres and large particles, and then centrifuge the filtrate at 8000r / Centrifuge at a speed of 1 min for 3 times, each time for 20 min. After the centrifugation, remove the supernatant and transfer it to a plastic beaker, freeze it with liquid nitrogen, and freeze-dry it at -55 °C and a pressure of less than 100 Pa for 48 h to obtain polyN- Isopropylacrylamide microsphere dry powder (PNIPAM microsphere dry powder), take out...

Embodiment 2

[0066] In this example, the preparation method of the polyethersulfone temperature-sensitive catalytic membrane is as follows:

[0067] (1) Take N-isopropylacrylamide as monomer, N,N-methylenebisacrylamide as crosslinking agent, and potassium persulfate as initiator, add the above substances and deionized water into a flat-bottomed flask and stir evenly , pass through nitrogen to remove oxygen for about 30min, seal the single-necked flask, and react at 65°C for 7h under stirring, filter the resulting reaction solution to remove agglomerated microspheres and large particles, and then centrifuge the filtrate at 6000r / Centrifuge for 3 times at a speed of 1 min, each time for 20 min. After the centrifugation, remove the supernatant and transfer it to a plastic beaker, freeze it with liquid nitrogen, and freeze-dry it at -55 ° C and a pressure of less than 100 Pa for 48 h to obtain PNIPAM microspheres. Dry powder, take it out and store it in a dry cabinet for later use; the ratio ...

Embodiment 3

[0071] In this example, the preparation method of the polyethersulfone temperature-sensitive catalytic membrane is as follows:

[0072](1) Take N-isopropylacrylamide as monomer, N,N-methylenebisacrylamide as crosslinking agent, and potassium persulfate as initiator, add the above substances and deionized water into a flat-bottomed flask and stir evenly , pass through nitrogen to remove oxygen for about 40min, seal the single-necked flask, and react at 75°C for 5h under stirring, filter the resulting reaction solution to remove agglomerated microspheres and large particles, and then centrifuge the filtrate at 9000r / Centrifuge at a speed of 4 minutes, 20 minutes each time. After the centrifugation, remove the supernatant and transfer it to a plastic beaker, freeze it with liquid nitrogen, and freeze-dry it at -55°C and a pressure of less than 100Pa for 48 hours to obtain PNIPAM microspheres. Dry powder, take it out and store it in a dry cabinet for later use; the ratio of the a...

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Abstract

The invention provides a polyethersulfone temperature-sensing catalytic membrane and a preparation method and an application thereof. The polyethersulfone temperature-sensing catalytic membrane is composed of a polyethersulfone membrane base material and temperature responsive microsphere carried with a nano metal catalyst distributed in the base material, the temperature responsive microsphere iscomposed of poly-isopropyl acrylamide microsphere, a poly dopamine coating positioned at the surface of the N-isopropyl acrylamide microsphere and the nano metal catalyst fixed at the poly dopamine coating. The catalytic membrane has a cell-shaped hole structure, the composition of the temperature responsive microsphere is mainly distributed at a hole wall of the cell-shaped hole structure. The flux and catalysis performance of the catalytic membrane is changed by responding the change of the temperature, when the usage temperature of the catalytic membrane is conversed from lower than the volume phase transition temperature of the poly N-isopropyl acrylamide to higher than the volume phase transition temperature of the N-isopropyl acrylamide, The catalysis reaction rate constant of the catalytic membrane is subjected to abrupt increase.

Description

technical field [0001] The invention belongs to the field of temperature-sensitive catalytic membranes, and relates to polyethersulfone temperature-sensitive catalytic membranes and a preparation method and application thereof. Background technique [0002] Catalytic membrane refers to a membrane with dual functions of catalysis and separation. At present, the existing methods of preparing catalytic membrane mainly include the following types. (1) metal ions are adsorbed onto the membrane carrier, and then adding a reducing agent such as sodium borohydride to reduce the metal ions to metal simple substances. The catalytic membrane catalyst prepared by this method has poor stability, because the catalyst particles are only fixed on the membrane surface. The utilization rate of the catalyst is low, resulting in a low catalytic rate of the catalytic membrane prepared by this method. (2) In situ reduction of metal ions to the carrier. Patra et al. prepared an anion exchange mem...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/02B01D71/68B01J31/06B01J35/00C02F1/44C02F1/70
CPCB01D67/0079B01D69/02B01D71/68B01D2325/10B01J31/06B01J35/006B01J35/0073C02F1/44C02F1/70
Inventor 谢锐郭石菲褚良银骆枫张磊刘壮巨晓洁汪伟
Owner SICHUAN UNIV
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