 In this study, researchers developed a new type of nanomaterial called iron-doped cerium, which can kill harmful bacteria found in hospital wastewater. This material is made up of cerium nanoparticles covered with violated chitosan, which helps them stick to the walls of the cells of the bacteria and prevent them from escaping. When exposed to visible light, the nanoparticles generate reactive oxygen species, ROS, such as singlet oxygen, hydroxyl radicals, and hydroxyl ions, which cause oxidative stress on the bacterial cells and lead to their death. The researchers found that this material had a high level of bactericidal activity against various strains of bacteria found in hospital wastewater. This article was offered by Sa Khan, Suleiman Faisal, Dilawar Farhan Shams, and others.