Water purification compositions and the method of producing the same

Patent metadata

Field	Value
Publication number	US-11390540-B2
Application number	US-202016940496-A
Country	US
Kind code	B2
Filing date	Jul 28, 2020
Priority date	Jun 28, 2018
Publication date	Jul 19, 2022
Grant date	Jul 19, 2022

Abstract

The present disclosure relates to water purification compositions and the method of producing the same. Specifically, the present disclosure relates to a method of producing a water purification composition including providing a substrate having one or more functional groups that has hydroxyl, thiol, carboxyl, and/or amino group; depositing a solution of a metal salt on the substrate; depositing a solution of carboxylic acid compound on the substrate; forming a mixture wherein the metal cross-links the hydroxyl, thiol, carboxyl and/or amino groups on the surface of the substrate, and the carboxylic acid compound; and heating the mixture till the product is dry.

First claim

What is claimed is:

1. A method of producing a water purification composition, comprising:
providing a substrate having one or more functional groups that has hydroxyl, thiol, carboxyl, and/or amino group;
depositing a solution of a metal salt on the substrate;
depositing a solution of carboxylic acid compound on the substrate;
forming a mixture wherein the metal cross-links the hydroxyl, thiol, carboxyl and/or amino groups on the surface of the substrate, and the carboxylic acid compound; and
heating the mixture until the product is dry,
wherein the carboxylic acid compound contains a positively charged group.

2. The method of claim 1 , further comprising:
heating the mixture so that the metal cross-links the hydroxyl, thiol, carboxyl and/or amino groups on the surface of the substrate.

3. The method of claim 1 , wherein the substrate is selected from a group consisting of wood, cellulose, alginate, carboxymethylcellulose, hydroxypropyl cellulose, chitin, lignin, tannin, silk, wool, chitosan, peanut hulls, wood pulp, grass, bamboo, polyvinyl alcohol, soybean waste, okara, cork, phenol-formaldehyde resins, corn cob, old newspaper, coconut husk, graphene oxide, activated carbon, amino resin, open celled foams containing hydroxyl, amino or carboxyl groups on its surface, coffee grounds, protein, and combination thereof.

4. The method of claim 1 , wherein the metal salt contains a cation selected from a group consisting of Al, Ti, Mn, Fe, Co, Ni, Cu, Zn, Zr, Mo, Sn, Bi, La, Ce, Y, and combination thereof.

5. The method of claim 1 , wherein the metal in the composition is in a reduced oxidation state compared with the metal in the metal salt.

6. The method of claim 1 , wherein the metal salt contains an anion selected from a group consisting of Cl − , NO 3 − , CH 3 CO 2 − , SO 4 2− , and combination thereof.

7. The method of claim 1 , wherein the metal salt is ammonium zirconium carbonate, ammonium zinc carbonate, Zr 2 OCl 2 .8H 2 O, ZrO(NO 3 ) 2 , or freshly prepared aqueous soluble Zr(OH) 2 .

8. The method of claim 1 , wherein the produced water purification composition comprises the substrate with a surface containing hydroxyl, thiol, carboxyl and/or amino groups, a carboxylic acid compound, and a metal, wherein the metal cross-links the hydroxyl, thiol, carboxyl and/or amino groups on the surface of the substrate, and the carboxylic acid compound.

9. A method of producing a water purification composition, comprising:
providing a substrate having one or more functional groups that has hydroxyl, thiol, carboxyl, and/or amino group;
depositing a solution of a metal salt on the substrate;
depositing a solution of carboxylic acid compound on the substrate;
forming a mixture wherein the metal cross-links the hydroxyl, thiol, carboxyl and/or amino groups on the surface of the substrate, and the carboxylic acid compound;
heating the mixture until the product is dry; and
treating the mixture with an alkali so that the carboxylic acid compound becomes covalently attached to the metal.

10. A method of producing a water purification composition,
providing a substrate having one or more functional groups that has hydroxyl, thiol, carboxyl, and/or amino group;
depositing a solution of a metal salt on the substrate;
depositing a solution of carboxylic acid compound on the substrate;
forming a mixture wherein the metal cross-links the hydroxyl, thiol, carboxyl and/or amino groups on the surface of the substrate, and the carboxylic acid compound; and
heating the mixture until the product is dry; and
wherein the carboxylic acid compound is selected from a group consisting of betaine or a betaine derivative, aromatic carboxylic acid, arginine, lysine, histidine, and combination thereof; and
wherein the carboxylic acid compound is selected from a group consisting of

wherein n is 1 through 8;
isoleucine betaine hydrochloride salt; and

11. A method of producing a water purification composition, comprising:
providing a starting substrate having one or more functional groups capable of reacting with ammonium zirconium carbonate, ammonium zinc carbonate, or an activated zirconium species generated by thermal decomposition;
depositing a carboxylic acid compound solution on the surface of the substrate;
treating the carboxylic acid compound deposited on the surface of the substrate with a solution of ammonium zirconium carbonate, ammonium zinc carbonate, or an activated zirconium species to form a mixture; and
heating the mixture till the product is ammonia and carbon dioxide free.

12. The method of claim 11 , further comprising:
treating the mixture with an alkali so that the carboxylic acid compound becomes covalently attached to the zirconium.

13. The method of claim 11 , wherein the mixture is heated to a temperature up to 80° C.

14. The method of claim 11 , wherein the mixture is heated between 70 and 80° C. for a period of time effective to form a composite that is free of ammonia and carbon dioxide.

15. The method of claim 11 , wherein the produced water purification composition comprises the substrate with a surface containing hydroxyl, thiol, carboxyl and/or amino groups, a carboxylic acid compound, and a metal, wherein the metal cross-links the hydroxyl, thiol, carboxyl and/or amino groups on the surface of the substrate, and the carboxylic acid compound.

Assignees

• Univ Arkansas

Inventors

• Viswanathan Tito

Classifications

• C02F2101/105

  Phosphorus compounds · CPC title

• B01J20/3221

  the chemical bond being an ionic interaction · CPC title

• C02F2101/20

  Heavy metals or heavy metal compounds · CPC title

• B01J20/28009

  Magnetic properties · CPC title

• B01J20/3236 Primary

  containing metal, other than zeolites, e.g. oxides, hydroxides, sulphides or salts · CPC title