Succinyl-beta-cyclodextrin modified PAN film adsorbing material and preparation method thereof

Abstract

The invention relates to a succinyl-beta-cyclodextrin modified PAN film adsorbing material and a preparation method thereof. The method comprises the following steps: firstly forming a dense polydopamine intermediate layer on a PAN film, wherein the polydopamine intermediate layer contains a large amount of hydrophilic hydroxyl and amino functional groups, and performing dehydration condensation on the amino of the polydopamine intermediate layer and carboxyl of succinyl-beta-cyclodextrin to obtain the succinyl-beta-cyclodextrin modified PAN film adsorbing material. The adsorbing material provided by the invention has good adsorption performance on hexavalent uranium through enveloping action of a hollow cavity of the cyclodextrin and uranium and action of carboxyl of succinyl and the hexavalent uranium, greatly improves the removal efficiency of the hexavalent uranium, and is easy to recover and recycle; and the succinyl-beta-cyclodextrin particles are firmly loaded and not easily disembedded, and have uniform loading, thereby increasing the contact area with pollutants, and improving the treatment efficiency.

Description

technical field [0001] The invention relates to a succinyl-β-cyclodextrin modified PAN membrane adsorption material and a preparation method thereof, belonging to the technical fields of chemistry and environment. Background technique [0002] Hexavalent uranium is the main raw material for manufacturing nuclear weapons and nuclear power fuels. It is often used as fuel for nuclear power reactors and is a very important energy source. But hexavalent uranium has certain radioactivity and chemical toxicity. According to statistics, there are about 4.5 billion tons of uranium in seawater, and these uraniums can theoretically generate nuclear energy for the whole world for thousands of years. A large amount of hexavalent uranium entering water not only causes hexavalent uranium pollution, but also causes serious waste of resources. However, the concentration of uranium in seawater is very low, and the salinity of seawater is high, so it is extremely challenging to enrich uraniu...

AI Technical Summary

Problems solved by technology

However, the current membrane separation processes such as microfiltration, ultrafiltration, and reverse osmosis mainly rely on the size of the membrane pore size for physical screening, which has poor separation selectivity and does not have the function of dealing with heavy metals and pollutants. Therefore, immobilizing cyclodextrin on the membrane On the surface, it is of great significance to develop new membrane materials to adsorb heavy metals, organic dyes and other pollutants while filtering.

[0005] In the prior art, there are two methods for loading cyclodextrin on the surface of polymer films or other materials. One is the co-deposition method, and the other is the chemical reaction modification method. Some chemical modification methods have cumbersome steps, take a long time, and require chemical activation of membrane materials, etc.

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