Preparation method and application of salicylic acid molecularly imprinted cellulose acetate blend membrane

Abstract

The invention relates to a preparation method of a cellulose acetate blended membrane and in particular relates to a preparation method of a salicylic acid molecular imprinted cellulose acetate blended membrane and application of the blended membrane to removal of salicylic acid in an aqueous solution. According to the preparation method, cellulose acetate (CA) is used as matrix, sulfonated polysulfone (SPS) is used as a functional polymer, polyethylene glycol-4000 (PEG 4000) or ionic liquid 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) is used as an additive, the imprinted blended membrane having the specific recognition property to salicylic acid molecules is synthesized, is used for performing selective recognition and separation on the salicylic acid in the aqueous solution, and has relatively high adsorbability and selectivity on the salicylic acid molecules.

Description

technical field [0001] The invention relates to a preparation method of a cellulose acetate blend film, in particular to a preparation method of a salicylic acid molecularly imprinted blend film, and its application to removing impurity salicylic acid from an aqueous solution, belonging to the technical field of material preparation and separation . Background technique [0002] Salicylic acid, also known as o-hydroxybenzoic acid, is an important raw material for fine chemicals. Salicylic acid (SA) and its derivatives are mainly used to relieve pain, reduce fever, and are also used as ingredients in some redness agents. It is used in chemical industry, medicine, cosmetics and other fields; since Kligman applied salicylic acid to cosmetics in 1997, it has brought a revolutionary change to the cosmetics industry, and cosmeceuticals have become popular, but it has recently been found that salicylic acid production is often accompanied by A variety of impurities with similar st...

AI Technical Summary

Problems solved by technology

[0002] Salicylic acid, also known as o-hydroxybenzoic acid, is an important raw material for fine chemicals. Salicylic acid (SA) and its derivatives are mainly used to relieve pain, reduce fever, and are also used as ingredients in some redness agents. It is used in chemical industry, medicine, cosmetics and other fields; since Kligman applied salicylic acid to cosmetics in 1997, it has brought a revolutionary change to the cosmetics industry, and cosmeceuticals have become popular, but it has recently been found that salicylic acid production is often accompanied by A variety of impurities with similar structures, such as p-hydroxybenzoic acid and phenol; these phenolic acids are often highly irritating and corrosive, and will cause inflammation if applied to the skin, and will endanger eye and skin health if used for a long time; in addition, Phenolic acids such as salicylic acid have high chromaticity and biological toxicity in waste liquid. Due to long-term discharge into the environment, such substances have been detected in wastewater, sewage and surface water. In particular, salicylic acid is due to the benzene ring The electron-withdrawing group carboxyl group on it is not easy to be biodegraded, and it is difficult for microorganisms to survive and cause great harm to the human body. Drinking polluted water will enrich the toxic substances in the human body, causing protein denaturation, damage to the liver and Renal function, and even death; therefore, the effective separation and enrichment of salicylic acid has important research significance

[0003] Previous traditional separation methods (catalytic degradation, extraction, distillation, adsorption, etc.) were difficult to separate salicylic acid from aqueous solution; membrane separation technology (Membrane Separation Technique, MST), which emerged in the 1860s, was characterized by its high efficiency, energy saving, The advantages of convenient operation, molecular-level filtration, and environmental friendliness have been widely used in the production process of enterprises; however, there are still some factors that limit the development of membrane separation technology. For example, the current membranes (ultrafiltration, microfiltration and reverse osmosis membranes) are only It can achieve the separation of a certain type of substance but cannot achieve the separation of a single substance, especially for organic compounds with similar structures, that is, it is impossible to perform a single, efficient and selective separation of a certain substance