Transition metal Fe, Co, Ni and Cu doped strontium titanate-rich SrTiO
3@TiO
2 (STO@T) materials were prepared by hydrothermal method. The prepared doped materials exhibit better photocatalytic CO
2 reduction to CH
4 ability under visible light conditions. Among them, Fe-doped and undoped SrTiO
3@TiO
2 under visible light conditions CO
2 reduction products only CO, while M-STO@T (M=Co, Ni, Cu) samples converted CO
2 to CH
4. The average methane yield of Ni-doped STO@T samples are as high as 73.85 μmol g
−1 h
−1. The production of methane is mainly due to the increase in the response of the doped samples to visible light. And the increase in the separation rate of photogenerated electrons and holes and the efficiency of electron transport caused by the generation of impurity levels. The impurity level caused by Ti
3+ plays an important role in the production of methane by CO
2 visible light reduction. Ni doping effectively improves the photocatalytic performance of STO@T and CO
2 reduction mechanism were explained.
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