Biosynthesized magnetic metal nanoparticles for oil spill remediation

Patent metadata

Field	Value
Publication number	US-9901903-B1
Application number	US-201715705191-A
Country	US
Kind code	B1
Filing date	Sep 14, 2017
Priority date	Sep 14, 2017
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

The biosynthesized magnetic metal nanoparticles for oil spill remediation are magnetic nanoparticles capped with an extract of Anthemis pseudocotula . The magnetic nanoparticles are formed by co-precipitation of ferric chloride hexahydrate and ferrous chloride tetrahydrate in an ethanol solution of the extract with the dropwise addition of ammonium hydroxide to raise the pH to between 8 and 11. The extract may be an extract of the aerial parts of Anthemis pseudocotula in a low polar extraction solvent, such as an n-alkane solvent or mono-di-, or trichloromethane. The extract is hydrophobic, improving dispersion of the magnetic nanoparticles in oil spills in seawater, resulting in 90% removal of oil for a 1:10 ratio of nanoparticles:oil by weight.

First claim

We claim:

1. A method of biosynthesizing magnetic metal nanoparticles for oil spill remediation, comprising the step of co-precipitating magnetic nanoparticles in a solution containing an extract of Anthemis pseudocotula.

2. The method of biosynthesizing magnetic metal nanoparticles according to claim 1 , wherein the solution containing an extract of Anthemis pseudocotula comprises ethanol having a concentrated extract of Anthemis pseudocotula dissolved therein.

3. The method of biosynthesizing magnetic metal nanoparticles according to claim 2 , wherein said concentrated extract comprises Anthemis pseudocotula extracted in an n-alkane.

4. The method of biosynthesizing magnetic metal nanoparticles according to claim 2 , wherein said concentrated extract comprises Anthemis pseudocotula extracted in a low polar solvent selected from the group consisting of mono-chloromethane, dichloromethane, and trichloromethane.

5. The method of biosynthesizing magnetic metal nanoparticles according to claim 1 , wherein said co-precipitating step comprises the steps of:
dissolving a concentrated extract of Anthemis pseudocotula in ethanol;
dissolving ferric chloride and ferrous chloride in deionized water in a molar ratio between 1:1 and 5:1 to form a precursor solution;
adding the precursor solution to the extract of Anthemis pseudocotula in ethanol to form a reaction mixture;
adding a 25% solution of ammonium hydroxide to the reaction mixture dropwise with continuous stirring at a temperature between 25° C. and 70° C. until the pH is between 8 and 11; and
stirring the reaction mixture for between 1 and 6 hours.

6. The method of biosynthesizing magnetic metal nanoparticles according to claim 5 , wherein said concentrated extract comprises an n-alkane extract of Anthemis pseudocotula.

7. The method of biosynthesizing magnetic metal nanoparticles according to claim 5 , wherein said concentrated extract comprises Anthemis pseudocotula extracted into a solvent selected from the group consisting of mono-chloromethane, dichloromethane, and trichloromethane.

8. The method of biosynthesizing magnetic metal nanoparticles according to claim 5 , further comprising the steps of:
collecting aerial parts of Anthemis pseudocotula plants; and
extracting the aerial parts in a low polar extraction solvent to obtain the extract of Anthemis pseudocotula.

9. The method of biosynthesizing magnetic metal nanoparticles according to claim 8 , further comprising the steps of chopping and air-drying the aerial parts in shade prior to the step of extracting the aerial parts.

10. The method of biosynthesizing magnetic metal nanoparticles according to claim 8 , wherein said low polar extraction solvent comprises an n-alkane solvent.

11. The method of biosynthesizing magnetic metal nanoparticles according to claim 8 , wherein said low polar extraction solvent comprises into a solvent selected from the group consisting of mono-chloromethane, dichloromethane, and trichloromethane.

12. The method of biosynthesizing magnetic metal nanoparticles according to claim 8 , wherein said step of extracting the aerial parts is performed at 25° C.

13. The method of biosynthesizing magnetic metal nanoparticles according to claim 8 , further comprising the step of concentrating the extract under reduced temperature and pressure.

14. A magnetic metal nanoparticle composition for oil spill remediation comprising magnetic nanoparticles capped with an extract of Anthemis pseudocotula.

15. The magnetic metal nanoparticle composition according to claim 14 , wherein said magnetic nanoparticles include iron in an Fe3+:Fe2+ oxidation state molar ratio between 1:1 and 5:1.

16. The magnetic metal nanoparticle composition according to claim 14 , wherein said extract of Anthemis pseudocotula comprises an extract of Anthemis pseudocotula into an n-alkane solvent.

17. The magnetic metal nanoparticle composition according to claim 14 , wherein said extract of Anthemis pseudocotula comprises an extract of Anthemis pseudocotula into an extraction solvent selected from the group consisting of mono-chloromethane, dichloromethane, and trichloromethane.

18. A method of oil spill remediation, comprising the steps of:
contacting an oil spill with magnetic nanoparticles capped with an extract of Anthemis pseudocotula in order to adsorb the oil onto the magnetic nanoparticles; and
applying a magnetic field to collect the magnetic nanoparticles with the adsorbed oil.

19. The method of oil spill remediation according to claim 18 , wherein said step of contacting an oil spill further comprises contacting the oil spill with magnetic nanoparticles in a nanoparticles:oil ratio of 1:10 by weight.

20. The method of oil spill remediation according to claim 18 , further comprising the steps of:
washing the collected magnetic nanoparticles with the adsorbed oil in chloroform;
thereafter, washing the collected magnetic nanoparticles in ethanol; and
re-using the washed magnetic nanoparticle to adsorb additional oil from the oil spill.

Assignees

• Univ King Saud

Inventors

• Abdullah Mahmood M S
• Atta Ayman M
• Al Lohedan Hamad A
• Alkhathlan Hamad Z
• Khan Merajuddin
• Ezzat Abdulrahman O

Classifications

• B01J20/0225

  Compounds of Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt · CPC title

• C02F2101/32

  Hydrocarbons, e.g. oil · CPC title

• C02F2305/08

  Nanoparticles or nanotubes · CPC title

• B01J20/28007

  with size in the range 1-100 nanometers, e.g. nanosized particles, nanofibers, nanotubes, nanowires or the like (carbon nanostructures B01J20/205) · CPC title

• B01J20/3217

  Resulting in a chemical bond between the coating or impregnating layer and the carrier, support or substrate, e.g. a covalent bond · CPC title