Porous noble metal oxide nanoparticles, method for preparing the same and their use

Patent metadata

Field	Value
Publication number	US-9291618-B2
Application number	US-201414468485-A
Country	US
Kind code	B2
Filing date	Aug 26, 2014
Priority date	Feb 5, 2014
Publication date	Mar 22, 2016
Grant date	Mar 22, 2016

Abstract

The present invention discloses a method for preparing porous noble metal oxide nanoparticles, comprising the following steps: a) preparing an Olea Europaea fruit extract; b) preparing an Acacia Nilotica extract; c) mixing the Olea Europaea fruit extract and the Acacia Nilotica extract for preparing a mixed extract; d) providing an aqueous solution containing a noble metal compound dissolved therein; e) mixing the mixed extract obtained in step c) and the aqueous solution of step d); f) dropping a solution of sodium chloride to be mixture of step b); g) drying the mixture, in air or by vacuum, and h) calcining at a temperature between 100 to 900° C., to get the porous noble metal oxide nanoparticles; porous noble metal oxide nanoparticles obtained thereby and their use.

First claim

The invention claimed is:

1. Method for preparing porous noble metal oxide nanoparticles, comprising the following steps:
a) preparing an Olea Europaea fruit extract
b) preparing an Acacia Nilotica extract
c) mixing the Olea Europaea fruit extract and the Acacia Nilotica extract for preparing a mixed extract
d) providing an aqueous solution containing a noble metal compound dissolved therein, and
e) mixing the mixed extract obtained in step c) and the aqueous solution of step d)
f) dropping a solution of sodium chloride to the mixture of step e)
g) drying the mixture, and
h) calcining at a temperature between 100 to 900° C., to get the porous noble metal oxide nanoparticles.

2. Method according to claim 1 , wherein the mixed extract obtained in step c) contains oleic acids and/or pentacyclic triterpenoids.

3. Method according to claim 1 , wherein the porous noble metal oxide nanoparticles are calcined in step h) at a temperature between 300 to 750° C.

4. Method according to claim 1 , wherein the preparation of the Olea Europaea fruit extract in step a) is performed by adding deionized or distilled water to Olea Europaea fruit.

5. Method according to claim 1 , wherein the preparation of the Acacia Nilotica extract in step b) is performed by adding deionized or distilled water to Acacia Nilotica.

6. Method according to claim 1 , wherein the Olea Europaea fruit extract and the Acacia Nilotica extract are mixed in step c) in a range of weight mixing ratios from 5:1 to 1:5.

7. Method according to claim 1 , wherein the noble metal compound comprises is Au or Ag.

8. Method according to claim 1 , wherein the noble metal compound is chloroauric acid.

9. Method according to claim 1 , wherein the aqueous solution provided in step d) also comprises a surfactant.

10. Porous noble metal oxide nanoparticles prepared by the method of claim 1 , wherein the average particle size is within a range of 10-100 nm.

11. Porous noble metal oxide nanoparticles according to claim 10 , wherein the noble metal oxide nanoparticles are substantially spherical or rods.

12. Porous noble metal oxide nanoparticles according to claim 10 , wherein the porous noble metal oxide nanoparticles have a surface area of 0.05-150 m 2 /g.

13. Porous noble metal oxide nanoparticles according to claim 10 , wherein the porous noble metal oxide nanoparticles have a pore volume of 0.0001-0.7 cm 3 /g.

14. An automated sequential injection method for chemi-luminescence determination of tramadol hydrochloride, comprising addition of the porous noble metal oxide nanoparticles according to claim 10 to a mixture containing tramadol hydrochloride for chemi-luminescence determination.

15. Method according to claim 9 , wherein the surfactant is cetyl trimethyl ammonium bromide (CTAB).

16. Method according to claim 1 wherein the step g) is carried out in in air or by vacuum.

Assignees

• Univ King Saud

Inventors

• Hendi Awatif Ahmed
• Awad Manal A
• Eisa Nada E
• Ortashi Khaled M

Classifications

• C01G7/00 Primary

  Compounds of gold · CPC title

• Y10T436/173845

  Amine and quaternary ammonium · CPC title

• C01P2006/14

  Pore volume · CPC title

• C01G5/00

  Compounds of silver · CPC title

• C01P2006/40

  Electric properties · CPC title