Reduction of hazardous reactive oxygen species (ROS) production of ZnO through Mn inclusion for possible UV-radiation shielding application

Kebadiretse Lefatshe; Genene T Mola; Cosmas M Muiva

doi:10.1016/j.heliyon.2020.e04186

Reduction of hazardous reactive oxygen species (ROS) production of ZnO through Mn inclusion for possible UV-radiation shielding application

Heliyon. 2020 Jun 12;6(6):e04186. doi: 10.1016/j.heliyon.2020.e04186. eCollection 2020 Jun.

Authors

Kebadiretse Lefatshe¹, Genene T Mola², Cosmas M Muiva¹

Affiliations

¹ Department of Physics and Astronomy, Botswana International University of Science and Technology, Private Bag 16. Palapye, Botswana.
² School of Chemistry & Physics, University of KwaZulu-Natal, Pietermaritzburg Campus, Private Bag X01, Scottsville 3209, South Africa.

Abstract

Mn_x - ZnO_(1-x) nanopowders were successfully synthesised through a simple sol-gel method. The samples were annealed at 300 °C to enhance their crystallinity. The lattice structure, morphology and optical properties of the prepared powdered samples were extensively studied using different characterization techniques, confirming the formation of Mn_x - ZnO_(1-x). The inclusion of Mn did not cause any change to the wurtzite structure of ZnO; however slight peak shifting and increase in lattice parameters were indicated. The normal absorption spectra pointed to a cut-off edge extending beyond the UV region and a Burstein- Moss type band gap broadening induced by the Mn doping. ZnO showed excellent photodegradation activity against methylene blue (MB) upon UV irradiation. Intensifying the dopant concentration resulted in further diminution of photoactivity against MB. This reduction of photocatalytic activity of ZnO upon doping can be drawn to be due to the presence of Mn in the ZnO lattice, which acted as recombination sites for the photogenerated charge carriers. The results demonstrated that doping ZnO with Mn can be used to suppress the oxidative stress induced by reduced oxygen species (ROS) through generation of recombination centres. The suppression of toxic ROS generation implies possible application in fabrics and ointments for UV shielding applications.

Keywords: Electron/hole pair; Materials science; Nanotechnology; Photocatalysis; Recombination centres; Semiconductor metal oxides.