Decomposition of 2-naphthol in water and antiviral activity of CoOx modified (Ce0.8,Bi0.2−y,Lay)O2−δ in the dark

CeO2 powders co-doped with Bi and La (Ce0.8,Bi0.2−y,Lay)O2−δ (CBLO) were prepared using hydrothermal processing. The entire doping molar amount of Bi and La against Ce [(Bi + La)/Ce] was fixed as 20 %. The sample surfaces were modified with CoOx using the chemisorption calcination cycle method. Only the peaks of CeO2 were detected by X-ray diffraction (XRD) in the obtained powder samples. The amounts of impregnated CoOx were almost equal for all samples. The 2-naphthol decomposition activity and the antiviral activity of obtained sample powders were evaluated in water in the dark, revealing the 2-naphthol decomposition activity as higher in samples with a higher Bi ratio, but the antiviral activity was highest in the sample synthesized with a Bi:La ratio of 2:8. These findings suggest that both the affinity and the decomposition power against the viruses affected the antiviral activity. The activity exhibited different compositional dependence from that of the 2-naphthol decomposition activity.