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Uniform flowerlike microspheres Cd 2+ /Fe 3+ co-doped BiOBr were prepared with the aid of the microwave hydrothermal process. The results indicate that the degradation performance of Bi 1- x  Cd  x  OBr and Bi 1- x  Fe  x  OBr are 1.31 and 2.05 times that of BiOBr for RhB, respectively. Moreover, the novel Cd 2+ /Fe 3+ co-doped BiOBr photocatalysts with ~0.42 eV impurity bands presented remarkably enhanced photocatalytic activities with being 3.10 times that of pure BiOBr, by achieving e - /h + efficient separation and narrowed bandgap with the ions synergistic effect of Cd 2+ and Fe 3+ . Based on DFT insights, the photodegradation mechanism was systematically studied that the conversion of multivalent Fe 3+ ions promoted the production of •O 2  - , and Cd 2+ ions worked as electron transfer mediators, which elucidated that the •O 2  - and h +  VB mainly participated in the catalytic reaction. The experimental and theoretical results show that the synergistic effects of multi-ion doping have great potential in the field of photocatalysis.

New Insights into Cd2+/Fe3+ Co-Doped BiOBr for Enhancing the Photocatalysis Efficiency of Dye Decomposition under Visible-Light