The replacement of energy-intensive Haber-Bosch technique for ammonia production to mitigate global warming is increasingly emphasized.In this paper,we report the preparation of Z-scheme heterojunction nanocomposites ...The replacement of energy-intensive Haber-Bosch technique for ammonia production to mitigate global warming is increasingly emphasized.In this paper,we report the preparation of Z-scheme heterojunction nanocomposites for photocatalytic nitrogen fixation by coupling ultrathin two-dimensional g-C_(3)N_(4) nanosheets with MIL-101(Fe)using a solvothermal method.Methanol was used as a hole sacrificing reagent to strengthen the catalytic performance.The highest NH3 yield of the composites under full spectrum irradiation was 472.8μmol·g^(−1)·h^(−1),which is about 3.5 times that of MIL-101(Fe).From BET results,photocatalyst with high specific surface area has superior nitrogen fixation performance.The results of PL,EIS,UPS,and ESR show that the presence of Z-scheme heterojunction is largely able to facilitate the separation of electrons and holes.It is one reason for improving performance of nitrogen fixation.The study has provided a viable approach to construct heterojunction photocatalysts with outstanding nitrogen fixation performance.展开更多
基金financially supported by the Natural Science Foundation of China(22071018)the Natural Science Foundation of Jilin Province(20220101069JC)
文摘The replacement of energy-intensive Haber-Bosch technique for ammonia production to mitigate global warming is increasingly emphasized.In this paper,we report the preparation of Z-scheme heterojunction nanocomposites for photocatalytic nitrogen fixation by coupling ultrathin two-dimensional g-C_(3)N_(4) nanosheets with MIL-101(Fe)using a solvothermal method.Methanol was used as a hole sacrificing reagent to strengthen the catalytic performance.The highest NH3 yield of the composites under full spectrum irradiation was 472.8μmol·g^(−1)·h^(−1),which is about 3.5 times that of MIL-101(Fe).From BET results,photocatalyst with high specific surface area has superior nitrogen fixation performance.The results of PL,EIS,UPS,and ESR show that the presence of Z-scheme heterojunction is largely able to facilitate the separation of electrons and holes.It is one reason for improving performance of nitrogen fixation.The study has provided a viable approach to construct heterojunction photocatalysts with outstanding nitrogen fixation performance.
