A kind of ultra/microfiltration membrane and its preparation method and use

Abstract

The present invention provides an ultrafiltration / microfiltration membrane comprising a matrix filter membrane and a sulfhydryl-modified polydopamine membrane layer deposited on the surface of the matrix filter membrane, wherein the surface of the sulfhydryl-modified polydopamine membrane layer is chemically bonded with free sulfhydryl groups. The sulfhydryl-modified polydopamine membrane layer isdeposited on the surface of the matrix filter membrane, the adsorption and removal of patulin in liquid containing patulin such as fruit juice can be effectively realized, the adsorption capacity canreach 30[mu]g / cm<2>, which solves the problems of residual adsorbents, low removal efficiency and difficult industrial application in the traditional separation process of patulin.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to an ultra / microfiltration membrane and its preparation method and application. Background technique [0002] Food safety is a major issue related to the national economy and the people's livelihood. Among them, excessive mycotoxins have become the biggest obstacle to the export of agricultural products in my country. According to statistics from the Agricultural Products Processing Research Institute of the Chinese Academy of Agricultural Sciences, during the 10 years from 2001 to 2011, affected by mycotoxin pollution, my country There were 2,559 illegal incidents of exporting food to the EU, of which mycotoxins exceeded the standard and accounted for 28.6%, higher than the well-known factors such as heavy metals, food additives and agricultural residues. So far, more than 300 types of mycotoxins have been discovered. It is a fungus of the genus Aspergillus, Penicilliu...

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Problems solved by technology

[0003] In recent years, many researchers have devoted themselves to the development of patulin removal methods, for example: CN105838703A discloses a method for removing patulin in citrus juice by using magnetic microspheres to immobilize inactivated yeast cells and its application. In this preparation method, Inactivated yeast with good adsorption capacity for patulin is immobilized on magnetic microspheres, which solves the problem of difficult separation of yeast from juice products after adsorbing patulin. CN106397692A discloses a magnetic molecular imprinted nanomaterial and its The preparation method uses 2-indolinone as a substitute template, methacrylic acid functionalized ferroferric oxide magnetic nanoparticles as a carrier, methacrylic acid as a functional monomer, and ethylene glycol dimethacrylate as a crosslinking agent, azobisisobutyronitrile as the initiator, and the surface molecular imprinting technology is used to prepare magnetic molecularly imprinted nanomaterials with adsorption effect on patulin. CN104045734A discloses a resin preparation method with high adsorption effect on patulin, The method uses polysaccharides as raw materials, and prepares polysaccharide resin particles through the processes of adsorption, dispersion, emulsification, pre-crosslinking, crosslinking, elution and modification, which can be used for the adsorption of patulin in the fields of fruit juices, beverages, etc., prepared by the above method The adsorbents are all in the form of granules. When in use, they are mixed with the target solution contaminated by patulin, and then separated after absorbing for a certain period of time. The above-mentioned method for removing patulin is relatively complicated, and there are adsorbents remaining in the solution. problem in

[0004] Those skilled in the art need to develop a new ultra / microfiltration membrane material for the removal of patulin in liquid on the basis of the existing technology, so as to solve the problem of adsorbent residue and low separation efficiency in the existing patulin removal process , Difficulty in industrial application, etc.

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