Abstract
An efficient photocatalyst capable of forming oxygen defects on the surface of mesoporous TiO2 was obtained via doping molybdenum ions which can obviously broaden the absorption range of TiO2 under visible light and reduce the recombination rate of photogenerated electron–hole pairs. The surface oxygen defects (Vo) introduced by metal molybdenum doping will adsorb and activate target molecules on the semiconductor surface. The effect of Vo content, modulated by Mo ions doping, on the photocatalytic NH3 production rates of the as-obtained samples was investigated. The optimal photocatalytic NH3 generation rate of Mo-doped TiO2 could reach 183.02 μmol·g−1·h−1 under visible light. PL and photoelectrochemical tests results demonstrated that Mo dopants could promote photogenerated carrier’s separation and restrain the recombination of carriers. Furthermore, the photocatalysts also exhibited good stability in the recycling experiments for 5 runs. The enhanced photocatalytic activity is owing to the Vo defect states, created by the Mo ion-doped, which benefits to the N2 adsorption and reduction at the Ti4+ activation center during the nitrogen fixation process.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 61308095, 21801092 and 21878119), Science and Technology Research Project of Henan Province (Grant No. 202102210055), General project of Chinese postdoctoral program (Grant No. 2020M672263) and the Key Research Programs in Universities of Henan Province (Grant No. 20A150031).
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Li, X., Li, J., Zhai, H. et al. Efficient Catalytic Fixation Nitrogen Activity Under Visible Light by Molybdenum Doped Mesoporous TiO2. Catal Lett 152, 116–123 (2022). https://doi.org/10.1007/s10562-021-03625-5
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DOI: https://doi.org/10.1007/s10562-021-03625-5