Event Title

Polyoxometalate Catalyzed Organic Dye Degradation

Graduation Year

2015

Location

Center for Natural Sciences, Illinois Wesleyan University

Start Date

12-4-2014 9:00 AM

End Date

12-4-2014 10:00 AM

Description

Polyoxometalates (POMs) have been of interest to chemists in recent years due, in part, to their ability to function as oxidation catalysts. POMs are also noted for their capabilities to act as photocatalysts. POMs are pH sensitive; most are stable only under acidic conditions. Because of their anionic character, POMs adhere to anion exchange resins, and the POM-resin adducts can serve as heterogeneous oxidation catalysts. In this work, the POM, sodium phosphotungstate, was adsorbed on the surface of the anion exchange resin Amberlite IRA 900. When pre-treated resin was stirred with a solution that was 0.10 M in sodium phosphotungstate and buffered to pH of 2.5 using a citric acid-phosphate buffer, all of the POM was taken up by the resin. The resin was used along with hydrogen peroxide and light to bleach the organic dye Rhodamine B.

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Apr 12th, 9:00 AM Apr 12th, 10:00 AM

Polyoxometalate Catalyzed Organic Dye Degradation

Center for Natural Sciences, Illinois Wesleyan University

Polyoxometalates (POMs) have been of interest to chemists in recent years due, in part, to their ability to function as oxidation catalysts. POMs are also noted for their capabilities to act as photocatalysts. POMs are pH sensitive; most are stable only under acidic conditions. Because of their anionic character, POMs adhere to anion exchange resins, and the POM-resin adducts can serve as heterogeneous oxidation catalysts. In this work, the POM, sodium phosphotungstate, was adsorbed on the surface of the anion exchange resin Amberlite IRA 900. When pre-treated resin was stirred with a solution that was 0.10 M in sodium phosphotungstate and buffered to pH of 2.5 using a citric acid-phosphate buffer, all of the POM was taken up by the resin. The resin was used along with hydrogen peroxide and light to bleach the organic dye Rhodamine B.