# US 11,305,255 B2 · MTBE-removal composition with acid-treated fly ash particles

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- Number: US 11,305,255 B2
- Document ID: US11305255B2
- Status: Granted
- Kind: B2
- Application number: 16/787,691
- Filed: 2020-02-11
- Published: 2020-06-04
- Granted: 2022-04-19
- Earliest claimed: 2014-08-29
- Assignees: King Fahd University of Petroleum and Minerals; King Abdulaziz City for Science and Technology
- Applicants: King Fahd University of Petroleum and Minerals; King Abdulaziz City for Science and Technology
- Inventors: Bassam Shafiq Tawabini; Muataz Ali Atieh; Faraj Ahmad Abuilaiwi; Segun Biodun Adebayo
- Web page: https://patentgrep.com/patent/US11305255B2

## CPC

- B01J 20/20: comprising free carbon; comprising carbon obtained by carbonising processes
- B01J 20/02: comprising inorganic material
- B01J 20/0233: {Compounds of Cu, Ag, Au}
- B01J 20/28059: {being less than 100 m2/g}
- C02F 1/288: {using composite sorbents, e.g. coated, impregnated, multi-layered}
- C02F 1/281: {using inorganic sorbents}
- C02F 1/283: {using coal, charred products, or inorganic mixtures containing them}
- C02F 2101/34: containing oxygen
- C02F 2305/08: Nanoparticles or nanotubes
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes)

## Abstract

Compositions for the adsorptive removal of methyl tertiary butyl ether (MTBE) from contaminated water sources and systems. The compositions contain carbon fly ash doped with silver nanoparticles at specific mass ratios. Methods of preparing and characterizing the adsorbents are described. The composition may contain carbon acid-treated fly ash particles that consist of carbon, oxygen, and sulfur, and have silver oxide nanoparticles present on the surface and in pore spaces of the carbon acid-treated fly ash particles. The composition may be in the form of particles having sizes in a range of 100 nm to 2.5 μm with a BET surface area of at least 16.789 m2/g, and contain the carbon acid-treated fly ash particles and the metal silver oxide nanoparticles at mass percentages of 50-90% and 10-50%, respectively.

## Claims

### Claim 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 and has a BET surface area of at least 16.789 m2/g,
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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 1)

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

### Claim 4 (depends on 1)

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.

### Claim 5 (depends on 1)

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

### Claim 6 (depends on 1)

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

### Claim 7 (depends on 1)

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