Nippon Filcon Co., Limited

Takehiro Kajiwara

Mitsuru Saito

Yoshinori Inoue

Toshifumi Katoh

Provided is a fibrous adsorbing material used for the adsorption and recovery of metals in a solution, which is a fibrous metal-adsorbing material that can be produced using existing production facilities without using special facilities or complicated operations, has high durability, is easy to diversify, and can be processed into various forms. The fibrous metal-adsorbing material is produced by a) a step of preparing an acrylate polymer having a large number of glycidyl groups in the molecule, b) a step of kneading a low-melting-point fiber matrix polymer therewith, c) a step of making the resulting mixture into a fibrous form by an melt-blend spinning method, and d) a step of allowing a long-chain ligand having an amino group or an imino group to react with glycidyl groups on the fiber surface to introduce a metal-adsorbing functional group. The fibrous metal-adsorbing material has high durability, is easy to diversify, and has various forms.

Fibrous metal-adsorbing material

Problem The present invention provides, in a metal-adsorbing material used for the removal and recovery of a wide range of heavy metals in treated solutions such as industrial waste water, service water, and environmental water, a gel-like metal-adsorbing material having a large amount of metal adsorption and capable of meeting various demands; and also provide a metal adsorbent having a gel-like metal-adsorbing material supported on a porous carrier. Means for Resolution A metal-adsorbing polymer selected from polyethyleneimine and polyallylamine is crosslinked with a polyglycidyl ether, whereby a gel-like metal-adsorbing material having a large amount of metal adsorption and capable of meeting various demands is produced. Further, a hydrophilic porous carrier is impregnated with a metal-adsorbing polymer, followed by crosslinking with a polyglycidyl ether, whereby a metal adsorbent having a gel-like metal-adsorbing material supported on the porous carrier, which has a large amount of metal adsorption and can meet various demands, is produced.

Metal-adsorbing gel and adsorbent supporting metal-adsorbing gel

Problem To provide a method for easily producing an adsorbing material used for the removal and recovery of metals and ions in a solution, which is highly durable and has various adsorptive functional groups and forms applicable for various purposes. Means for Resolution A polymer adsorbent for metals and ions, which is highly durable and has various adsorptive functional groups and forms applicable for various purposes, is produced by a) preparing a reactive polymer having a large number of halogenated alkyl groups or glycidyl groups in the molecule, b) preparing a base material polymer insoluble in water and alcohols, c) dissolving the reactive polymer and the base material polymer in an organic solvent to give a mixed solution, d) removing the organic solvent to give a solid carrier in a desired form, and e) allowing a halogenated alkyl group or a glycidyl group in the solid carrier to react with an amine compound having a functional group capable of adsorbing metals and ions, thereby introducing an adsorptive functional group.

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Inagi, Japan

Takehiro Kajiwara