Fig. 9 from Rapid preparation of terbium-doped titanium dioxide nanoparticles and their enhanced photocatalytic performance WangZhencui SongYuechao CaiXingfei ZhangJun TangTianle WenShaobai 2019 The photocatalytic activity of 1.0%Tb-TiO<sub>2</sub> at different periodic cycles.