REMOVAL OF ORGANIC DYES AND ORGANIC POLLUTANTS BY TITANIUM PEROXIDE GEL

• US 20120125844A1
• Filed: 07/30/2010
• Published: 05/24/2012
• Est. Priority Date: 07/31/2009
• Status: Active Grant

• Current Assignee: Council of Scientific & Industrial Research
• Original Assignee: Council of Scientific & Industrial Research
• Inventors: Dongare, Mohan Kerba, Umbarkar, Shubhangi Bhalchandra
• Granted Patent: US 9,149,673 B2
• Time in Patent Office: Days
• US Class Current: 210/635
• CPC Class Codes: A62D 2101/20 Organic substances
• CPC Class Codes: A62D 3/11 Electrochemical processes, e.g. electrodialysis
• CPC Class Codes: A62D 3/176 Ultraviolet radiations, i.e. radiation having a wavelength of about 3nm to 400nm
• CPC Class Codes: A62D 3/38 by oxidation; by combustion
• CPC Class Codes: B01D 15/3861 using an external stimulus
• CPC Class Codes: B01D 15/3871 using light
• CPC Class Codes: Y02W 10/37 using solar energy

Abstract

The one step process of removal of chromophore/dye/organic pollutant from a solution comprising a polymer free titanium oxide gel i.e. high zeta potential is disclosed. The concentration of the chromophores is removed up to 95-100%.

Claims

1. A one step process for the removal of organic dye and/or organic pollutants from solution using titanium peroxide gel, the process comprising:

a) adding titanium peroxide gel into the solution in ratio ranging between 1;

5 to 1;

20 volume/volume of gel/dye solution;

b) shaking the mixture as obtained in step (a) vigorously at temperature ranging between 25-35°

C.;

c) allowing the mixture as obtained in step (b) to stand for 5 to 25 minutes to obtain dye or organic pollutant adsorbed titanium peroxide gel and clear, colorless supernatant followed by filtering the mixture to obtain dye or organic pollutant adsorbed titanium peroxide gel;

d) transferring dye or organic pollutant adsorbed titanium peroxide gel as obtained in step (c) in a water containing beaker; and

e) degrading adsorbed dye or organic pollutant from the dye or organic pollutant adsorbed titanium peroxide gel to recover the titanium peroxide gel for reuse.

2. The process of claim 1, wherein the solution used in step (a) comprises organic dye and/or organic pollutants and a solvent selected from the group consisting of water, acetone, chlorinated solvents and alcohols.

3. The process of claim 1, wherein titanium peroxide gel used in step (a) has a zeta potential in the range of −

54 to −

25 mV and viscosity in the range of 12000-15000 cps.

4. The process of claim 1, wherein titanium peroxide gel used in step (a) is optionally doped with noble and transition metals selected from the group consisting of Au, Ag, nickel, copper, iron, molybdenum, vanadium, tungsten and platinum in the range of 0.1-4 wt %.

5. The process of claim 1, wherein an organic dye or an organic pollutant is selected from the group of methylene blue, methyl orange,methyl violet, malachite green, Rhodamine B, bromophenol blue, parabase solution, magenta solution, ink, formaldehyde solution, synthetic hexamine waste water, phenol.

6. The process of claim 1, wherein titanium peroxide gel used in step (a) is optionally be put in a column and allowing the dye solution to pass through it to obtain clear, colorless supernatant.

7. The process of claim 1, wherein the concentration of the organic dye and organic pollutants is removed up to 95-100%.

8. The process of claim 1, wherein said degradation of organic dye and organic pollutant from dye or organic pollutant adsorbed titanium peroxide gel in step (e) is done by exposing it under sunlight with or without an oxidant.

9. The process of claim 8, wherein oxidant used is selected from the group consisting of hydrogen peroxide and sodium hypochlorite.

10. (canceled)