Efficient visible-light-induced photocatalytic activity over the novel Ti-doped BiOBr microspheres

► A novel Ti-doped BiOBr photocatalyst was obtained by double self-assemble method. ► The possible formation process of the Ti0.22BiO1.48Br samples was investigated. ► The Ti0.22BiO1.48Br samples exhibited higher photocatalytic activity than BiOBr.