Decomposition of 2-naphthol in water and antiviral activity of CoO_x modified (Ce_0.8,Bi_0.2−y,La_y)O_2−δ in the dark

抄録

CeO₂ powders co-doped with Bi and La (Ce_0.8,Bi_0.2−y,La_y)O_2−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 CoO_x 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 CoO_x 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.