Functionalized silica nanoparticles for lead adsorption

Patent metadata

Field	Value
Publication number	US-12458948-B1
Application number	US-202519202569-A
Country	US
Kind code	B1
Filing date	May 8, 2025
Priority date	May 21, 2024
Publication date	Nov 4, 2025
Grant date	Nov 4, 2025

Abstract

A method for preparing silica nanoparticles, the method comprising: adding centrimonium bromide (CTAB) to a water and ethanol to create a first reaction mixture; adding NH4OH to the reaction mixture to create a second reaction mixture; adding a first amount of tetraethyl orthosilicate (TEOS) to the second reaction mixture to create a third reaction mixture; adding ethylenediaminetetraacetic acid (EDTA) to the third reaction mixture then adding a second amount of TEOS to create a fourth reaction mixture; obtaining formed silica spheres; separating the formed silica spheres; washing the formed silica spheres with water and ethanol; and drying the formed silica spheres in an oven for at least about 8 hours to obtain silica nanoparticles.

First claim

We claim:

1 . A method for separating lead from thallium, the method comprising: contacting a sample containing lead with EDTA and surfactant functionalized silica nanoparticles comprising about 53 atomic % to about 54 atomic % carbon, about 3 atomic % to about 4 atomic % nitrogen, about 33 atomic % to about 34 atomic % oxygen, and about 9 atomic % to about 10 atomic % silicon.

2 . The method of claim 1 , wherein the EDTA and surfactant functionalized silica nanoparticles are in contact with the sample for at least about 0.5 minutes to at least about 180 minutes.

3 . The method of claim 1 , wherein the sample has a pH of 3.

4 . The method claim 1 , wherein the EDTA and surfactant functionalized silica nanoparticles have an oval shape.

5 . The method of claim 1 , wherein the EDTA and surfactant functionalized silica nanoparticles have a size ranging from about 700 nm to about 838 nm.

6 . The method of claim 1 , wherein the EDTA and surfactant functionalized silica nanoparticles have a diameter ranging from about 361 nm to about 580 nm.

Assignees

• Univ King Saud

Inventors

• Habila Mohamed Abdelaty
• Alobaysi Ahmad Saud Abdullah
• Aljammaz Ibrahim
• Alothman Zeid Abdullah

Classifications

• B01J20/28004

  Sorbent size or size distribution, e.g. particle size · CPC title

• C22B13/04

  by wet processes · CPC title

• B01J20/3251

  comprising at least two different types of heteroatoms selected from nitrogen, oxygen or sulphur · 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

• B01J20/3204

  Inorganic carriers, supports or substrates · CPC title