Kampouri, S; Nguyen, TN; Spodaryk, M; Palgrave, RG; Züttel, A; Smit, B; Stylianou, KS; (2018) Concurrent Photocatalytic Hydrogen Generation and Dye Degradation Using MIL‐125‐NH₂ under Visible Light Irradiation. Advanced Functional Materials , 28 (52) , Article 1806368. 10.1002/adfm.201806368.

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Abstract

The impact of different transition metal‐based co‐catalysts toward photocatalytic water reduction when they are physically mixed with visible‐light active MIL‐125‐NH₂ is first systematically studied. All co‐catalyst/MIL‐125‐NH₂ hotocatalytic systems are found to be highly stable after photocatalysis, with the NiO/MIL‐125‐NH₂ and Ni₂ P/MIL‐125‐NH₂ systems exhibiting high hydrogen (H₂) evolution rates of 1084 and 1230 µmol h⁻¹ g⁻¹, respectively. Second, how different electron donors affect the stability and H2 generation rate of the best Ni2P/MIL‐125‐NH₂ system is investigated and it is found that triethylamine fulfils both requirements. Then, the electron donor is replaced with rhodamine B (RhB), a dye that is commonly used as a simulant organic pollutant, with the aim of integrating the photocatalytic H₂ generation with the degradation of RhB in a single process. This is of supreme importance as replacing the costly (and toxic) electron donors with hazardous molecules present in wastewater makes it possible to oxidize organic pollutants and produce H₂ simultaneously. This is the first study where a metal–organic framework (MOF) system is used for this dual‐photocatalytic activity under visible light illumination and the proof‐of‐concept approach envisions a sustainable waste‐water remediation process driven by the abundant solar energy, while H₂ is produced, captured, and further utilized.

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