Method of synthesizing silver nanoparticles from waste film

Patent metadata

Field	Value
Publication number	US-9347114-B1
Application number	US-201514874281-A
Country	US
Kind code	B1
Filing date	Oct 2, 2015
Priority date	Oct 2, 2015
Publication date	May 24, 2016
Grant date	May 24, 2016

Abstract

A method of synthesizing silver nanoparticles from waste film includes providing waste film including a silver halide salt and gelatin, mixing the waste film with an alkaline solution to form a mixture, heating the mixture, and subjecting the mixture to ultracentrifugation to isolate silver nanoparticles in the mixture. The film can include waste radiographic or photographic film pieces. Glucose and/or polyvinylpyrrolidone (PVP) may be added to the mixture. The nanoparticles can have an average particle size of about 2 nm to about 10 nm. The silver nanoparticles can be resistant to synthetic stomach fluid and showed high antimicrobial activity.

First claim

We claim:

1. A method of synthesizing silver nanoparticles from waste film comprises:
providing waste film including a silver halide salt and gelatin;
mixing the waste film with an alkaline solution to form a mixture;
heating the mixture to a temperature of about 50° C. to about 70° C.; and
adding a glucose solution to the mixture after heating the mixture to a temperature of about 50° C. to about 70° C.

2. The method of synthesizing silver nanoparticles according to claim 1 , further comprising subjecting the mixture including the glucose solution to ultracentrifugation to isolate silver nanoparticles in the mixture.

3. The method of synthesizing silver nanoparticles according to claim 1 , further comprising heating the mixture to a temperature of about 70° C. to about 90° C. after adding the glucose solution to the mixture.

4. The method of synthesizing silver nanoparticles according to claim 1 , wherein the alkaline solution includes sodium hydroxide (NaOH) or ammonia.

5. The method of synthesizing silver nanoparticles according to claim 4 , wherein the mixture further includes poly vinyl pyrrolidone (PVP).

6. The method of synthesizing silver nanoparticles according to claim 5 , further comprising heating the mixture to its boiling point after heating the mixture to a temperature of about 50° C. to about 70° C.

7. The method of synthesizing silver nanoparticles according to claim 1 , wherein the waste film includes waste radiographic or photographic film pieces.

8. The method of synthesizing silver nanoparticles according to claim 7 , wherein the radiographic film pieces include medical X-ray film pieces.

9. The method of synthesizing silver nanoparticles according to claim 1 , wherein the silver nanoparticles are about 2 nm to about 10 nm in size.

10. The method of synthesizing silver nanoparticles according to claim 1 , wherein the silver nanoparticles are monodisperse.

11. A method of synthesizing silver nanoparticles from waste film comprises:
providing waste film including a silver halide salt and gelatin;
mixing the waste film with an alkaline solution to form a mixture;
heating the mixture to a temperature of about 50° C. to about 70° C.; and
subjecting the mixture to ultracentrifugation to isolate silver nanoparticles in the mixture.

12. The method of synthesizing silver nanoparticles according to claim 11 , further comprising adding a glucose solution to the mixture after heating the mixture to a temperature of about 50° C. to about 70° C.

13. The method of synthesizing silver nanoparticles according to claim 12 , further comprising heating the mixture to a temperature of about 70° C. to about 90° C. after adding the glucose solution to the mixture.

14. The method of synthesizing silver nanoparticles according to claim 11 , wherein the alkaline solution includes sodium hydroxide (NaOH).

15. The method of synthesizing silver nanoparticles according to claim 14 , wherein the mixture further includes poly vinyl pyrrolidone (PVP).

16. The method of synthesizing silver nanoparticles according to claim 15 , further comprising heating the mixture to boiling point after heating the mixture to a temperature of about 50° C. to about 70° C.

17. The method of synthesizing silver nanoparticles according to claim 11 , wherein the waste film includes waste radiographic or photographic film pieces.

18. The method of synthesizing silver nanoparticles according to claim 17 , wherein the radiographic film pieces include medical X-ray film pieces.

19. The method of synthesizing silver nanoparticles according to claim 11 , wherein the silver nanoparticles are about 2 nm to about 10 nm in size.

20. The method of synthesizing silver nanoparticles according to claim 11 , wherein the silver nanoparticles are monodisperse.

Assignees

• Univ King Saud

Inventors

• Atta Ayman Mohamamdy
• Al-Lohedan Hamad Abdullha
• Ezzat Abdelrahman Osama

Classifications

• B22F1/0545

  Dispersions or suspensions of nanosized particles · CPC title

• C23F11/18

  using inorganic inhibitors · CPC title

• A61K9/14

  Particulate form, e.g. powders, {Processes for size reducing of pure drugs or the resulting products, Pure drug nanoparticles (microspheres A61K9/16; microcapsules A61K9/50; nanocapsules, nanoparticles of the matrix type A61K9/51)} · CPC title

• B22F9/24

  starting from liquid metal compounds, e.g. solutions · CPC title

• A01N59/16 Primary

  Heavy metals; Compounds thereof · CPC title