Glyphosate, N-(phosphonomethyl) glycine, is the most widely used herbicide for weed control that is commercialized as Roundup. Although glyphosate (GLP) is classified as low toxicity pesticide, several reports have demonstrated its side effects on non-target plants and organisms. Furthermore, the persistence of glyphosate in the environment resulted in increased adverse effects on terrestrial and aquatic organisms. Moreover, recent studies have found a link between glyphosate and indirect adverse health effects on the human and animal organs, such as the liver and the kidney, and has been linked to Lymphoma cancer. In this presentation, we describe the light-activated catalytic degradation of glyphosate by Pd/m-BiVO4/BiOBr photocatalyst. We prepared m-BiVO4/BiOBr nanosheets and the ternary composite photocatalyst Pd/m-BiVO4/BiOBr, according to our previously reported one-pot synthesis. The bare m-BiVO4/BiOBr and the Pd-decorated particles, with various Pd content, were employed in the photocatalytic degradation of glyphosate and subsequently aminomethylphosphonic acid (AMPA), under simulated sunlight irradiation. The kinetics of the photocatalytic degradation reaction was studied by monitoring the concentration of glyphosate and its degradation products by ion chromatography. Complete degradation of glyphosate by Pd/m-BiVO4/BiOBr was achieved within 5 minutes of the reaction. The stability of the photocatalyst for multiple degradation cycles and the mechanism of the reaction are demonstrated. Our mechanistic studies displayed that the holes and superoxide radicals are the main species involved in the degradation of glyphosate. The catalyst stability study revealed that the nanocomposite maintained over 75% of its activity after six cycles of the degradation of glyphosate. Such results could lead to the development of sustainable catalytic technologies to minimize the global impact of glyphosate.

Rapid photocatalytic degradation of glyphosate by palladium-decorated m-BiVO4/BiOBr nanosheets

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.