A series of P–N junction photocatalysts, NiO/TiO
prepared by incipient wetness impregnation. The photocatalysts were characterized by UV–vis spectroscopy,
XRD and XPS. The photoactivity of photocatalysts was tested by the degradation of methylene blue. The
results showed that 0.5 wt.% NiO/TiO
2
had the highest activity as compared with TiO
.AP–N junction
mechanism was proposed and verified that the photocurrent could be enhanced under forward bias in the
NiO/TiO
2
film. The photoactivity enhancement is attributed to P–N junction and co-catalyst effects.
2
2
, were