Method for preventing or reducing growth of a microorganism on a surface

Patent metadata

Field	Value
Publication number	US-11700855-B2
Application number	US-202017093715-A
Country	US
Kind code	B2
Filing date	Nov 10, 2020
Priority date	Sep 27, 2018
Publication date	Jul 18, 2023
Grant date	Jul 18, 2023

Abstract

Methods of synthesizing Bi 2 S 3 —CdS particles in the form of spheres as well as properties of these Bi 2 S 3 —CdS particles are described. Methods of photocatalytic degradation of organic pollutants employing these Bi 2 S 3 —CdS particles and methods of preventing or reducing microbial growth on a surface by applying these Bi 2 S 3 —CdS particles in the form of a solution or an antimicrobial product onto the surface are also specified.

First claim

The invention claimed is:

1. A method for reducing growth of a microorganism on a surface, the method comprising:
applying Bi 2 S 3 —CdS particles onto the surface,
wherein the Bi 2 S 3 —CdS particles comprise bismuth(III) sulfide and cadmium(II) sulfide,
wherein the Bi 2 S 3 —CdS particles are in sphere form,
wherein the Bi 2 S 3 —CdS particles are in contact with the surface for a time period in a range of from 1 to 24 hours, and
wherein the microorganism is at least one gram-negative bacterium selected from the group consisting of Acinetobacter baumannii, Enterobacter aerogenes, Escherichia coli, Klebsiella oxytoca , and Klebsiella pneumoniae , or
wherein the microorganism is at least one gram-positive bacterium selected from the group consisting of Staphylococcus aureus, Staphylococcus epidermis , and MRSA.

2. The method of claim 1 , wherein an atomic ratio of bismuth to cadmium in the Bi 2 S 3 —CdS particles is in a range of from 0.5:1 to 4:1, and an atomic ratio of sulfur to bismuth in the Bi 2 S 3 —CdS particles is in a range of from 3:2 to 8:1.

3. The method of claim 1 , Wherein the Bi 2 S 3 —CdS particles have a BET surface area in a range of from 5 to 25 m 2 /g, a pore size in a range of from 10 to 50 nm, and a pore volume in a range of from 0.02 to 0.2 cm 3 /g.

4. The method of claim 1 , herein the Bi 2 S 3 —CdS particles are applied onto the surface as a solution comprising
a solvent, and
relative to a total solution volume, the Bi 2 S 3 —CdS particles in a range of from 1 μg/mL to 50 mg/ml.

5. The method of claim 4 , wherein the solvent comprises dimethyl sulfoxide and water.

6. The method of claim 1 , wherein the microorganism is at least one gram-negative bacterium selected from the group consisting of Acinetobacter baumannii, Enterobacter aerogenes, Escherichia coli, Klebsiella oxytoca , and Klebsiella pneumoniae.

7. The method of claim 1 , wherein the microorganism is at least one gram-positive bacterium selected from the group consisting of Staphylococcus aureus, Staphylococcus epidermis , and MRSA.

8. The method of claim 1 , wherein the microorganism comprises the Acinetobacter baumannii.

9. The method of claim 1 , wherein the microorganism comprises the Enterobacter aerogenes.

10. The method of claim 1 , wherein the microorganism comprises the Escherichia coli.

11. The method of claim 1 , wherein the microorganism comprises the Klebsiella oxytoca.

12. The method of claim 1 , wherein the microorganism comprises the Klebsiella pneumoniae.

13. The method of claim 1 , wherein the microorganism comprises the Staphylococcus aureus.

14. The method of claim 1 , wherein the microorganism comprises the Staphylococcus epidermis.

15. The method of claim 1 , wherein the microorganism comprises the MRSA.

16. The method of claim 1 , wherein a count of the microorganism on the surface is reduced by at least 50%, relative to an untreated control surface.

17. The method of claim 1 , wherein a count of the microorganism on the surface is reduced by at least 70%, relative to an untreated control surface.

18. The method of claim 4 , wherein, relative to the total solution volume, the Bi 2 S 3 —CdS particles in a range of from 10 μg/mL to 100 μg/mL.

19. The method of claim 13 , wherein the Bi 2 S 3 —CdS particles are applied onto the surface as a solution comprising
a solvent, and
relative to a total solution volume, the Bi 2 S 3 —CdS particles in a range of to 100 μg/mL.

20. The method of claim 1 , consisting of the applying of the Bi 2 S 3 —CdS particles, optionally as a solution, onto the surface.

Assignees

• Univ Imam Abdulrahman Bin Faisal

Inventors

• Nawaz Muhammad
• Qureshi Faiza

Classifications

• B01J35/40

  characterised by dimensions, e.g. grain size (in a colloidal state B01J35/23; crystallite size B01J35/77) · CPC title

• B01J35/51

  Spheres · CPC title

• C01G29/00

  Compounds of bismuth · CPC title

• A01N59/16 Primary

  Heavy metals; Compounds thereof · CPC title

• B01J27/04

  Sulfides · CPC title