Method of dye removal from wastewater

Patent metadata

Field	Value
Publication number	US-2016318772-A1
Application number	US-201514701135-A
Country	US
Kind code	A1
Filing date	Apr 30, 2015
Priority date	Apr 30, 2015
Publication date	Nov 3, 2016
Grant date	—

Abstract

A method of dye removal from wastewater includes producing activated carbon from heavy oil fly ash and using the activated carbon to adsorb dye in the wastewater. The heavy oil fly ash based activated carbon is produced using phosphoric acid based chemical activation. The dye can be removed from wastewater by contacting the wastewater with the activated carbon. The activated carbon can then be separated from the wastewater to remove the dye, and thereby, purify the wastewater.

First claim

We claim:

1 . A method of dye removal from wastewater, comprising:
impregnating heavy oil fly ash with phosphoric acid to provide an impregnated material; heating the impregnated material to temperatures of about 450° C. to about 900° C. to provide powdered activated carbon (PAC); contacting the wastewater with the powdered activated carbon; adsorbing dye from the wastewater by the powdered activated carbon; separating the powdered activated carbon from the wastewater to remove the adsorbed dye.

2 . The method of dye removal from wastewater according to claim 1 , wherein the separating is performed by filtering the wastewater using a 0.2 μm filter.

3 . The method of dye removal from wastewater according to claim 1 , wherein an impregnation ratio of the phosphoric acid and the heavy oil fly ash is about 0.8.

4 . The method of dye removal from wastewater according to claim 1 , wherein the dye is selected from the group consisting of Rhodamine B, Methyl Orange and mixtures thereof.

5 . The method of dye removal from wastewater using activated carbon according to claim 1 , wherein the contacting is for a period of at least 20 minutes.

6 . The method of dye removal from wastewater using activated carbon according to claim 1 , wherein the concentration of the powdered activated carbon is in the range of 100 mg/L to 4,000 mg/L.

7 . The method of dye removal from wastewater using activated carbon according to claim 1 , wherein the concentration of the powdered activated carbon is 2,000 mg/L.

8 . The method of dye removal from wastewater using activated carbon according to claim 1 , wherein the impregnated fly ash is heated to a temperature of about 500° C.

9 . The method of dye removal from wastewater using activated carbon according to claim 1 , wherein the SSA BET value of the activated carbon is about 59 m 2 /g.

10 . The method of dye removal from wastewater using activated carbon according to claim 1 , wherein a pH or the wastewater is maintained at a value of about pH3 to about pH8.

Assignees

• Univ King Fahd Pet & Minerals

Inventors

• Vohra Muhammad Shariq

Classifications

• C02F2101/308

  Dyes; Colorants; Fluorescent agents · CPC title

• C02F1/283 Primary

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

• C02F1/288

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

• C02F1/444

  by ultrafiltration or microfiltration · CPC title