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After Zn-doped CeO 2 (CZnO) was synthesized using a hydrothermal method, its antiviral activity was evaluated under dark and visible-light conditions.The obtained sample was a white, single-phase powder with a fluorite-type crystal structure.Compared with undoped CeO 2 , CZnO exhibited a smaller lattice constant and a larger specific surface area.Its antiviral activity was assessed in accordance with ISO standards using an enveloped virus (bacteriophage 6) and a non-enveloped virus (bacteriophage Q).Even in the dark, CZnO showed distinct antiviral activity against both viruses, with stronger effects observed for 6.Detailed analyses indicated that particle size, released ions, and surface charge contributed to the antiviral behavior under dark conditions.Under visible-light irradiation, the antiviral performance of CZnO was enhanced further, with a particularly pronounced effect found against Q.This enhancement is attributed to photocatalytic effects: Zn doping was found to narrow the band gap and increase photon absorption.These findings indicate CZnO as a novel inorganic antiviral material capable of exhibiting antiviral activity under both dark and visible-light conditions without the need for any co-catalyst or rareearth dopant.
Tomaru et al. (Wed,) studied this question.