Preparation and application methods of hexavalent chromium ion blotting compound membrane with acrylamide as functional monomer

Abstract

The invention relates to preparation and application methods of a hexavalent chromium ion blotting compound membrane with acrylamide as the functional monomer and belongs to the technical field of heavy metal ion absorption separation. According to the preparation method of the hexavalent chromium ion blotting compound membrane with the acrylamide as the functional monomer, hexavalent chromium ions serve as the template ions, the acrylamide serves as the functional monomer, glycol dimethacrylate serves as the cross-linking agent, azobisisobutyronitrile serves as the initiator, a mixed solutionof organic solvent and water at a volume ratio of 1:1 serves as the pore-forming solvent, and a surface grafting method is applied to a support membrane to prepare the hexavalent chromium ion blotting compound membrane with the acrylamide as the functional monomer. The hexavalent chromium ion blotting compound membrane with the acrylamide as the functional monomer is prepared by taking an existing commercial membrane as the support membrane and through metal ion blotting technology, saves complex operations such as grinding or screening, is simple in preparation method and high in environmentadaptability and can be applied to absorption separation of hexavalent chromium ions in Cr (VI)-containing solutions.

Description

technical field [0001] The invention relates to a preparation method and application of a hexavalent chromium ion imprinted composite membrane using acrylamide as a functional monomer, and belongs to the technical field of heavy metal ion adsorption and separation. Background technique [0002] With the rapid development of human economy, chromium and its compounds are widely used in electroplating, metal polishing, leather tanning, textile dyeing and other industries, causing serious pollution. Among all valence states of chromium, trivalent chromium and hexavalent chromium can exist stably in nature, and a small amount of trivalent chromium is an essential trace element for life, while hexavalent chromium is a carcinogen, and its toxicity has been proved by experiments It is more than 100 times that of trivalent chromium, which can lead to major diseases such as lung cancer and liver cancer. Therefore, the elimination of hexavalent chromium ions in water is of great signif...

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Problems solved by technology

[0003] At present, the elimination methods of hexavalent chromium ions mainly include membrane separation method, electrolysis method, chemical precipitation method, ion exchange method and adsorption method, among which adsorption method is the most commonly used method, which has the advantages of high efficiency, low cost and easy operation. , but the conventional adsorption method is not conducive to the specific identification of specific ions, which will increase the difficulty of re-separation later