Benzene removal using carbon nanotubes impregnated with iron

Patent metadata

Field	Value
Publication number	US-9296625-B2
Application number	US-201314103949-A
Country	US
Kind code	B2
Filing date	Dec 12, 2013
Priority date	Dec 12, 2013
Publication date	Mar 29, 2016
Grant date	Mar 29, 2016

Abstract

Multi-walled carbon nanotubes impregnated with iron nanoparticles are synthesized. The multi-walled carbon nanotubes are used as sorbents to remove benzene from water. The removal of benzene increases with the increase of impregnated iron percent in the multi-walled carbon nanotube.

First claim

The invention claimed is:

1. A method for removing benzene from a benzene-containing aqueous composition, comprising:
contacting an adsorbent with the benzene-containing aqueous composition;
wherein the adsorbent comprises multi-walled carbon nanotubes having an outside diameter of 10-20 nm and an inside diameter of 5-10 nm, with iron(III) oxide nanoparticles impregnated on outside walls of the multi-walled carbon nanotubes.

2. The method of claim 1 , wherein the contacting is carried out at a pH of 6.

3. The method of claim 1 , wherein the multi-walled carbon nanotubes are impregnated with 5-25% by weight of the iron(III) oxide nanoparticles based on the total weight of the iron nanoparticles and the multi-walled carbon nanotubes.

4. The method of claim 3 , wherein the multi-walled carbon nanotubes are impregnated with 5-15% by weight of the iron(III) oxide nanoparticles based on the total weight of the iron(III) oxide nanoparticles and the multi-walled carbon nanotubes.

5. The method of claim 1 , wherein the benzene is present in the benzene-containing aqueous composition at a concentration of 10-1,000 ppm.

6. The method of claim 1 , in which 100% benzene is removed from benzene-containing aqueous composition with 15 mg of the multi-walled carbon nanotubes impregnated with 20% of the iron(III) oxide nanoparticles by weight based on the total weight of the iron nanoparticles and the multi-walled carbon nanotubes, the benzene-containing aqueous composition having a volume of 50 ml, an initial benzene concentration of 1 mg/L and a pH of 6.

7. The method of claim 1 , wherein the multi-walled carbon nanotubes have a length of 20-60 Lm.

8. The method of claim 1 , wherein the multi-walled carbon nanotubes comprise no side holes.

9. The method of claim 1 , wherein the multi-walled carbon nanotubes are capped.

10. The method of claim 1 , wherein the multi-walled carbon nanotubes consist of carbon and hydrogen atoms.

11. The method of claim 1 , wherein the contacting is carried out at 150 rpm.

12. The method of claim 1 , wherein the contacting is carried for 24 h.

13. The method of claim 1 , wherein the multi-walled carbon nanotubes are impregnated with 14-16% by weight of the iron(III) oxide nanoparticles based on the total weight of the iron nanoparticles and the multi-walled carbon nanotubes.

Assignees

• Univ King Fahd Pet & Minerals

Inventors

• Bakather Omer Yahya
• Atieh Muataz Ali

Classifications

• C02F1/283 Primary

  using coal, charred products, or inorganic mixtures containing them · CPC title

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title

• B01J20/3295

  Coatings made of particles, nanoparticles, fibers, nanofibers · CPC title

• C02F2101/322

  Volatile compounds, e.g. benzene · CPC title

• B82Y30/00

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title