Magnetic Nanocomposites for the Remote Activation of Sulfate Radicals for the Removal of Rhodamine B

This project explores the potential of utilizing the exposure of a magnetic nanocomposite system to an alternative magnetic field (AMF) to remove organic pollutants from water and investigates the effects of sulfate radical activation on removal efficacy. When exposed to an AMF, magnetic nanocomposites become locally energized, and the associated heating can degrade contaminants. This research addresses the need for sustainable water treatment methods due to the potential threats of organic hazards on the environment and human health. The project aims to determine the effects of AMF and sodium persulfate (SPS) exposure on contaminant removal. The magnetic nanocomposite system consisted of a polyacrylamide-based hydrogel loaded with iron oxide magnetic nanoparticles (MNPs). Rhodamine B (RhB) dye was used as a model organic contaminant, allowing for degradation to be measured quantitatively using UV-vis spectroscopy. Results indicated that RhB removal by the nanocomposite without SPS was proportional to the concentration of MNPs in the nanocomposite. With the addition of SPS, 100% of the RhB was removed within 20 minutes. The removal was attributed to the activation of sulfate radicals by the MNPs and the heating caused by AMF exposure. This magnetic nanocomposite system shows potential as a unique water treatment method for environmental contaminants.