UiO-66-NH2/TiO2/Ti3C2 composite photocatalyst with efficient hydrogen production and preparation method thereof

Abstract

The invention relates to a UiO-66-NH2 / TiO2 / Ti3C2 composite photocatalyst with efficient hydrogen production and a preparation method thereof. The preparation method comprises the following steps: Ti3AlC2 is placed in a polytetrafluoroethylene inner liner, a hydrofluoric acid solution is added, and obtained Ti3C2Tx is annealed to obtain a TiO2 / Ti3C2 compound; zirconium tetrachloride, N,N-dimethylformamide and hydrochloric acid are mixed to obtain a zirconium tetrachloride solution; the TiO2 / Ti3C2 compound is added to the zirconium tetrachloride solution and stirred to obtain a Zr<4+> / TiO2 / Ti3C2mixed solution; 2-aminoterephthalic acid and the N,N-dimethylformamide are mixed to obtain an organic ligand solution; and the organic ligand solution is added to the Zr<4+> / TiO2 / Ti3C2 mixed solutionfor hydrothermal reaction to obtain the UiO-66-NH2 / TiO2 / Ti3C2 composite photocatalyst with efficient hydrogen production. The UiO-66-NH2 / TiO2 / Ti3C2 composite photocatalyst with efficient hydrogen production and the preparation method thereof have simple process and strong operability, and the prepared product can significantly improve the separation of photogenerated electrons-hole pairs in the photocatalytic process, and has excellent visible light decomposition water hydrogen production performance.

Description

technical field [0001] The invention belongs to the technical field of composite photocatalysts. Specifically related to a UiO-66-NH with high efficiency hydrogen production 2 / TiO 2 / Ti 3 C 2 Composite photocatalyst and preparation method thereof. Background technique [0002] The massive combustion of fossil fuels has brought about global energy shortages and environmental pollution problems. Finding clean and sustainable alternative energy sources is a current research hotspot, and it is also a demand for the rapid development of society. Simulating the photosynthesis process in nature, using photocatalytic water splitting is an important way to convert solar energy into hydrogen energy. However, the water oxidation half-reaction is difficult to occur due to the four-electron transfer process involved. Therefore, finding stable and efficient photocatalysts is one of the key factors to realize photocatalytic water splitting. [0003] Metal-organic frameworks (MOFs f...

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Problems solved by technology

However, a single UiO-66-NH 2 Photocatalysts also face some problems, such as narrow photoresponse range, high recombination probability of photogenerated electron-hole pairs and low quantum yield, etc.

In order to improve these problems, further improve the efficiency of hydrogen production by photolysis of water, and rationally select other semiconductor materials, it is a simple and easy method to synthesize composite photocatalysts. For example, there are research reports: MoS 2 Introduction of UiO-66-NH 2 Composite photocatalyst MoS 2 / UiO-66-NH 2 / G(Hao, Xuqiang, et al. Peculiar synergetic effect of MoS 2 quantum dots and graphene on Metal-Organic Frameworks for photocatalytic hydrogen evolution.Applied Catalysis B:Environmental210(2017):45-56.), Cd 0.2 Zn 0.8 S introduces UiO-66-NH 2 Synthesized in and Cd 0.2 Zn 0.8 S / UiO-66-NH 2 (Su, Yun, et al. Cd 0.2 Zn 0.8 S@UiO-66-NH 2 nanocomposites as efficient and stable visible-light-driven photocatalyst for H 2 evolution and CO 2 reduction.Applied Catalysis B:Environmental200(2017):448-457), but the above reports have not effectively solved the above problems

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