MOFs as photocatalyst for H2 production based on water photolysis have received considerable attention. Among various MOF-based photocatalysts, NH2-MIL-125 (Ti) having a narrow band gap of 2.5eV, is reported as a potential photocatalyst that is able to produce hydrogen under visible-light irradiation. However, photoactivity of NH2-MIL-125 (Ti) for H2 production is not as much effective as traditional semiconductor photocatalysts. Therefore, it remains an important challenge to improve the photocatalytic performance of NH2-MIL-125 (Ti) photocatalysts. One of the strategies to enhance the photocatalytic activity of NH2-MIL-125 (Ti) is to hybridize with other semiconducting photocatalysts. In this study, a novel hybrid composites of NH2-MIL-125 (Ti) and ZnCr-LDH nanosheets were synthesized by a solvothermal reaction. The hybridization of NH2-MIL-125 (Ti) with ZnCr-LDH nanosheets has been found to have significant effect on the morphology, and optical property of NH2-MIL-125 (Ti). Compared to pure NH2-MIL-125 (Ti) with high surface area, the hybrid composites exhibited improved photocatalytic activity and excellent photo-chemical stability for H2 production under visible light irradiation. Such improved photocatalytic activity could be ascribed to the strong electronic coupling between these two components; the expanded light absorption, band alignment for enhancing lifetime of photo-induced electrons and holes. Additionally, the hybrid composites could be also applied as photocatalysts for environment remediation. These results demonstrate that the present synthesis strategy can provide the development of new and various photocatalysts based on the MOF. Details of the work will be presented.

Hybrid NH2-MIL-125 (Ti) and ZnCr-LDH photocatalyst for improving H2 production under visible light

2019 Fall National Meeting

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