Abstract
A series of metal oxide/ metal-organic frameworks (MOFs) composites (MO@Fe/Ce-MOFs) were synthesized by partial thermal decomposition of Fe/Ce-MOFs which were synthesized with dielectric barrier discharge (DBD) plasma. The heterojunction interface between MOFs and metal oxides can effectively promote the electron interface transfer. When Fe was introduced, the energy band of the catalysts became narrower, and the increase of oxygen defects concentration slowed down the recombination rate of photogenerated electrons and holes, which greatly improved the photocatalytic performance. MO@Fe/Ce-MOFs exhibited more efficient visible light photocatalytic performance than that of Fe/Ce-MOFs. MO@Fe/Ce-MOFs-b (the molar ratio of Fe to Ce is 1:3) formed an abundant oxygen defect that facilitated the photocatalytic nitrogen fixation reaction. For MO@Fe/Ce-MOFs-b, the NH4+ generation rate reached 299 μmol·L−1·h−1 after 2 h photoreaction under visible light with N2 and deionized water as solvent. Also, MO@Fe/Ce-MOFs-b showed high cyclic stability. After three repeated cycles, the NH4+ generation rate maintained about 95%. This work provided a new method for the preparation of MO@MOFs and emphasized the importance of oxygen defects in nitrogen fixation.
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