Glyphosate adsorption and degradation in aquatic systems using manganese oxide coated magnetic nanoparticles
Document Type
Event
Abstract
Abstract: Glyphosate (PMG) is a broad-spectrum herbicide ingredient and one of the most widely used herbicide in the world. The increasing presence in the environment has generated concerns about its safety to both humans, wildlife, and aquatic life. Hence, there is a necessity to remove glyphosate from the environment. In this study, we investigate the removal of glyphosate from aquatic system using magnetic iron oxide nanoparticle coated with amorphous manganese oxide (MNP-MnOx). Adsorption and degradation of PMG using MNP-MnOx was studied using batch experiments and attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy. ATR-FTIR spectra of nanoparticles treated with PMG revealed that PMG adsorption on the surface of the nanoparticles was via its phosphonate and carboxylic groups. The spectra of the dried nanoparticles before treatment with PMG was subtracted from the spectra of the corresponding nanoparticles after treatment with PMG to obtain difference spectra (adsorbed PMG species). The difference spectra at the pH values studied show that PMG adsorption onto the MNP was mainly through the carboxylate group. Total phosphorus (P) quantitation of the supernatants by inductively coupled plasma-optical emission spectrometry (ICP-OES) after 48 h batch adsorption experiments reveal maximum and minimum P removal of 79.2 ± 2.20 % and 46.1 ± 2.94 %, at pH 2.3 and 9.0, respectively. The interaction between the coated nanoparticles and PMG appears to result in sorption and degradation, processes that would reduce PMG in aquatic systems. Preliminary results on the coated nanoparticles’ ability to activate peroxymonosulfate (PMS) and enhance PMG degradation will be presented.
Glyphosate adsorption and degradation in aquatic systems using manganese oxide coated magnetic nanoparticles
Breakout Session B: Chemical Sciences
CASB 102Abstract: Glyphosate (PMG) is a broad-spectrum herbicide ingredient and one of the most widely used herbicide in the world. The increasing presence in the environment has generated concerns about its safety to both humans, wildlife, and aquatic life. Hence, there is a necessity to remove glyphosate from the environment. In this study, we investigate the removal of glyphosate from aquatic system using magnetic iron oxide nanoparticle coated with amorphous manganese oxide (MNP-MnOx). Adsorption and degradation of PMG using MNP-MnOx was studied using batch experiments and attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy. ATR-FTIR spectra of nanoparticles treated with PMG revealed that PMG adsorption on the surface of the nanoparticles was via its phosphonate and carboxylic groups. The spectra of the dried nanoparticles before treatment with PMG was subtracted from the spectra of the corresponding nanoparticles after treatment with PMG to obtain difference spectra (adsorbed PMG species). The difference spectra at the pH values studied show that PMG adsorption onto the MNP was mainly through the carboxylate group. Total phosphorus (P) quantitation of the supernatants by inductively coupled plasma-optical emission spectrometry (ICP-OES) after 48 h batch adsorption experiments reveal maximum and minimum P removal of 79.2 ± 2.20 % and 46.1 ± 2.94 %, at pH 2.3 and 9.0, respectively. The interaction between the coated nanoparticles and PMG appears to result in sorption and degradation, processes that would reduce PMG in aquatic systems. Preliminary results on the coated nanoparticles’ ability to activate peroxymonosulfate (PMS) and enhance PMG degradation will be presented.