Fiber capable of forming metal chelate, process for producing the same, method of trapping metal ion with the fiber, and metal chelate fiber

A process for producing a metal chelate-forming fiber, comprising the steps of:

• subjecting a crosslinkable compound having a reactive double bond and a glycidyl group in its molecule to graft reaction with a fiber molecule of a natural or regenerated fiber using a redox catalyst;
• and
• allowing the resulting graft reaction product to be bonded with at least one metal chelate-forming compound selected from the group consisting of aminocarboxylic acid, aminodicarboxylic acids, thiocarboxylic acids and phosphoric acid which are reactive with an epoxy group, to form a metal chelate forming moiety having a hydroxyl group and an oxygen atom adjacent to a carbonyl group.

A method of capturing metal ions, comprising the steps of:

• providing a metal chelate-forming fiber comprising at least one metal chelate-forming compound selected from the group consisting of aminocarboxylic acid, aminodicarboxylic acids, thiocarboxylic acid and phosphoric acid bonded to a fiber molecule of a natural fiber or regenerated fiber through a graft reaction product of a crosslinkable compound which has a reactive double bond and a glycidyl group in its molecule, wherein the metal chelate-forming fiber includes a metal chelate forming moiety having a hydroxyl group and an oxygen atom adjacent to a carbonyl group;
• and
• bringing the metal chelate-forming fiber into contact with an aqueous liquid containing metal ions to thereby capture the metal ions from the aqueous liquid.

A method of capturing metal ions, comprising the steps of:

• providing a metal chelate-forming fiber comprising at least one metal chelate-forming compound selected from the group consisting of aminocarboxylic acid, aminodicarboxylic acids, thiocarboxylic acid and phosphoric acid bonded to a fiber molecule of a natural fiber or regenerated fiber through a graft reaction product of a crosslinkable compound which has a reactive double bond and a glycidyl group in its molecule, wherein the metal chelate-forming fiber includes a metal chelate forming moiety having a hydroxyl group and an oxygen atom adjacent to a carbonyl group;
• and
• bringing the metal chelate-forming fiber into contact with an oily liquid containing metal ions to thereby capture the metal ions from the oily liquid.

A method of capturing metal ions, comprising the steps of:

• providing a metal chelate-forming fiber comprising at least one metal chelate-forming compound selected from the group consisting of aminocarboxylic acid, aminodicarboxylic acids, thiocarboxylic acid and phosphoric acid bonded to a fiber molecule of a natural fiber or regenerated fiber through a graft reaction product of a crosslinkable compound which has a reactive double bond and a glycidyl group in its molecule, wherein the metal chelate-forming fiber includes a metal chelate forming moiety having a hydroxyl group and an oxygen atom adjacent to a carbonyl group;
• and
• bringing the metal chelate-forming fiber into contact with a gas containing metal ions to thereby capture the metal ions from the gas.

A metal chelate fiber comprising a metal is bonded by chelation to the metal chelate-forming fiber comprising at least one metal chelate-forming compound selected from the group consisting of aminodicarboxylic acids, thiocarboxylic acid and phosphoric acid which are reactive to an epoxy group, is bonded to a fiber molecule of a natural fiber or regenerated fiber through a graft reaction product of a crosslinkable compound which has a reactive double bond and a glycidyl group in its molecule;

• and
• wherein said metal chelate-forming fiber includes a metal chelate forming moiety having a hydroxyl group and an oxygen atom adjacent to a carbonyl group.