Doped silver nanoparticles on carbon fly ash for adsorption of methyl tertiary butyl ether

Patent metadata

Field	Value
Publication number	US-10596546-B2
Application number	US-201715836186-A
Country	US
Kind code	B2
Filing date	Dec 8, 2017
Priority date	Aug 29, 2014
Publication date	Mar 24, 2020
Grant date	Mar 24, 2020

Abstract

Methods and compositions for the adsorptive removal of methyl tertiary butyl ether (MTBE) from contaminated water sources and systems. The compositions are in the form of particles having sizes in a range of 100 nm to 2.5 μm and contain acid-treated fly ash doped with 1-10 nm silver oxide nanoparticles. The compositions may comprise 50-90 wt % acid-treated fly ash and 10-50 wt % silver oxide nanoparticles relative to a total weight. Methods of preparing and characterizing the compositions are also provided.

First claim

The invention claimed is:

1. A composition for removing MTBE from an aqueous solution, comprising:
acid-treated fly ash particles; and
silver oxide nanoparticles having diameters in a range of 1-10 nm;
wherein the acid-treated fly ash particles consist of carbon, oxygen, and sulfur;
wherein the silver oxide nanoparticles are present on the surface and in pore spaces of the acid-treated fly ash particles,
wherein the composition is in the form of particles having sizes in a range of 100 nm to 2.5 μm,
wherein the acid-treated fly ash particles and the silver oxide nanoparticles are present in the composition at mass percentages of 50-90% and 10-50%, respectively, based on the total weight of the composition,
wherein the acid-treated fly ash particles are prepared by:
stirring a raw fly ash with nitric acid to form a slurry; and
washing the slurry to produce the acid-treated fly ash particles.

2. The composition of claim 1 , wherein the composition has a BET surface area of at least 15 m 2 /g.

3. The composition of claim 1 , wherein the acid treated fly ash particles consist of 80.2 wt % carbon, 13.4 wt % oxygen, and 6.4 wt % sulfur, each relative to a total weight of the acid-treated fly ash.

4. The composition of claim 1 , which consists of acid-treated fly ash particles and silver oxide nanoparticles.

5. The composition of claim 1 , which consists of 76.3 wt % carbon, 7.8 wt % oxygen, 5.3 wt % sulfur, and 10.6 wt % silver oxide nanoparticles, each relative to a total weight of the composition.

6. The composition of claim 1 , wherein the silver oxide nanoparticles have diameters in a range of 1-5 nm.

7. The composition of claim 6 , wherein the silver oxide nanoparticles have diameters in a range of 1-2 nm.

8. The composition of claim 1 , wherein the raw fly ash has an orbicular structure and a 100 μm average particle diameter.

Assignees

• Univ King Fahd Pet & Minerals
• King Abdulaziz City Sci & Tech
• King Fahd Unversity of Petroleum and Minerals

Inventors

• Tawabini Bassam Shafiq
• Atieh Muataz Ali
• Abuilaiwi Faraj Ahmad
• Adebayo Segun Biodun

Classifications

• C02F1/288

  using composite sorbents, e.g. coated, impregnated, multi-layered · CPC title

• B01J20/20 Primary

  comprising free carbon; comprising carbon obtained by carbonising processes · CPC title

• C02F1/281

  using inorganic sorbents · CPC title

• B01J20/28059

  being less than 100 m2/g · CPC title

• C02F2305/08

  Nanoparticles or nanotubes · CPC title