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

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...

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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.Pandey, D.Sen, S.Mazumder, A.Goswami, Appl.Catal.A Gen.2016,524,214.), this method is mainly to immobilize silver particles on the surface of the membrane, The catalytic space formed is relatively small, the utilization rate of catalyst and membrane substrate is low, and its catalytic rate needs to be improved

The catalytic membranes prepared by the above methods do not have temperature responsiveness, and have no responsiveness to environmental changes. With the change of processing conditions, the catalytic performance of the catalytic membrane cannot be stably adjusted, and cannot adapt to changes in external conditions and maintain good catalytic performance. performance, but there is no report on the temperature-sensitive catalytic membrane

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