Rapid Photocatalytic Mineralization of Glyphosate and AMPA by Pd@m-BiVO4/BiOBr Nanosheets: Mechanistic Studies and Degradation Pathways

Caitlyn Dollar, Sarah Abaddi, Nicholas Ensinger, and Dr. Elsayed M. Zahran Department of Chemistry, Ball State University, 2000 West University Avenue, Muncie, IN, 47306

Glyphosate, N-(phosphonomethyl) glycine, is the active ingredient in many widely used herbicides, such as Roundup, Rodeo, and Pondmaster. Although glyphosate (GLP) is classified as a low toxicity pesticide, several reports have demonstrated its side effects on non-target plants and organisms. With long-term exposure, glyphosate is linked to serious adverse effects on the renal, endocrine, reproductive, and gastrointestinal systems. Aminomethylphosphonic acid (AMPA) is an equally toxic by-product of glyphosate degradation. This work analyzes the kinetics and the degradation pathways of glyphosate and AMPA by Pd@m-BiVO4/BiOBr photocatalyst under simulated sunlight irradiation. Complete degradation of glyphosate by Pd@m-BiVO4/BiOBr was achieved within 5 minutes of the reaction. The Pd@m-BiVO4/BiOBr photocatalyst demonstrated high stability with maintaining over 75% of its activity after six degradation cycles. Our mechanistic studies showed that the main charge carriers involved in the mineralization of glyphosate are the holes and superoxide radicals. Such results could lead to the development of sustainable catalytic technologies to minimize the global impact of glyphosate.

Additional Abstract Information

Presenter: Caitlyn Dollar

Institution: Ball State University

Type: Poster

Subject: Chemistry

Status: Approved

Time and Location

Session: Poster 4
Date/Time: Tue 11:00am-12:00pm
Session Number: 3525