Preparation method of polyacrylonitrile chelating resin adsorbent

Abstract

The invention discloses a preparation method of a polyacrylonitrile chelating resin adsorbent. The method includes firstly, adding polyacrylonitrile microspheres to reaction solvents for immersion; secondly, adding 2-aminothiazole which serves as a ligand and metallic sodium which serves as a catalytic agent to the swelling polyacrylonitrile microspheres for reaction under protection of nitrogen; and thirdly, using the reaction solvents to immerse modified polyacrylonitrile chelating resins, washing the modified polyacrylonitrile chelating resins until washing liquids are colorless, sequentially using deionized water, alcohol and diethyl ethers to wash the modified polyacrylonitrile chelating resins for a plurality of times, then using distilled water to wash the modified polyacrylonitrile chelating resins, sequentially performing alkali wash, water washing, acid washing and water washing, and drying the polyacrylonitrile chelating resins to constant weight at the temperature between 40 DEG C and 60 DEG C to obtain the polyacrylonitrile chelating resin adsorbent. The polyacrylonitrile chelating resin adsorbent prepared by the method can absorb Hg (II) ions in a higher selectivity mode.

Description

technical field [0001] The invention relates to a preparation method of a novel polyacrylonitrile chelating resin adsorbent, in particular to a modified chelating resin material capable of selectively adsorbing heavy metal ions in food, having good adsorption performance and being reusable, and a preparation method thereof . Background technique [0002] The analysis and detection of trace and trace metal elements in water and food is of great significance to protect people's health and enhance people's physical fitness. With the development of modern analytical techniques and analytical instruments, the detection limits of elements have been greatly reduced. However, during the analysis of trace and ultra-trace heavy metal elements, direct determination is very difficult due to the interference of a large number of coexisting elements. At present, there are mainly two ways to solve this problem. One way is to develop the combined technology of instruments, such as ICP-MS....

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Problems solved by technology

Among them, artificially synthesized parent polystyrene resins are widely used. In the synthesis process of this type of resin, chloromethyl ether needs to be used, and the grafted ligand is generated by hydrogen chloride waste, which seriously pollutes the environment. not tall

Chelating resins based on natural raw materials have the advantages of wide sources, low price, and easy degradation. However, such materials have the disadvantages of low stability, poor mechanical strength, low adsorption capacity, and difficult regeneration, which limit their application.

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