Preparation method of monolithic polysulfone bipolar membrane with side group bonded with porphyrin group

Abstract

The invention relates to a preparation method of a monolithic polysulfone bipolar membrane with a side group bonded with a porphyrin group. The preparation method comprises the following steps: respectively synthesizing a polysulfone-based membrane mixed solution containing porphyrin and epoxy group side groups by taking bromo-methylated polysulfone and a bromo-methylated polysulfone polymer as starting raw materials, mixing, casting on a clean glass plate, and drying to prepare a polysulfone-based membrane containing porphyrin and epoxy group side groups; and sulfonating, aminating and quaternizing the base membrane, and washing with deionized water to obtain the monolithic polyaryletherketone bipolar membrane containing the phthalocyanine side group. According to the bipolar membrane prepared by the method, an epoxy group is introduced into a polysulfone side group through nucleophilic substitution reaction, and anion and cation exchange membranes are introduced into a polysulfone molecular chain so that a membrane forming process is omitted, and the use of carcinogen chloromethyl ether is avoided. The prepared bipolar membrane has a self-catalysis effect, and is low in resistance and low in transmembrane voltage. And after long-term use, the problems of bubbling, cracking and the like of the middle interface layer, which are easily caused in the use process of the compositebipolar membrane, can be avoided.

Description

technical field [0001] The invention relates to a method for preparing a monolithic polysulfone bipolar membrane with side groups bonded to porphyrin groups. Oxygen group polysulfone is blended into a membrane as a base membrane material, and anion and cation are introduced through epoxy group reaction on both sides of the base membrane to synthesize a monolithic polysulfone bipolar membrane containing porphyrin group. Background technique [0002] Bipolar membrane is a new branch developed on the basis of ion exchange membrane technology, and has rapidly developed into a research hotspot in the field of membrane technology. It is usually a functional membrane with a three-layer structure composed of an anion exchange layer, a cation exchange layer and an intermediate catalytic layer that splits water rapidly. Under the action of a DC electric field, the water in the interface layer of the bipolar membrane dissociates, and H is obtained on both sides of the membrane. + and...

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Problems solved by technology

This method also has several obvious disadvantages: first, the grafting rate is low, and the grafting uniformity is also poor; second, because the porous material is used as the base membrane, the grafted monomers on both sides avoid mutual penetration, and the bipolar membrane The middle interface layer is not clear; the third is that the method of co-radiation grafting will cause a large amount of monomers to self-polymerize, and the utilization rate of the monomers is very low, which is not suitable for industrial production; the fourth is to achieve the required grafting rate. The grafted membrane is cleaned and grafted again (similar to the above-mentioned U.S. patent soaking the monomer solution multiple times and polymerizing), so that the synthesis steps are increased; the fifth is affected by the grafted monomer, the bipolar membrane prepared in the paper, Regardless of its positive or negative side, the chemical stability and thermal stability of its functional groups with ion exchange capabilities are not high, thus greatly limiting its scope of use

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