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Stable Layered Semiconductive Cu(I)–Organic Framework for Efficient Visible-Light-Driven Cr(VI) Reduction and H2 Evolution

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journal contribution
posted on 18.06.2018, 12:04 by Di-Ming Chen, Chun-Xiao Sun, Chun-Sen Liu, Miao Du
Metal–organic frameworks (MOFs) have gained tremendous attention in the fields of environmental restoration and sustainable energy for their potential use as photocatalyst. Herein, a new two-dimensional (2D) Cu­(I)-based MOF material showing a narrow forbidden-band of 2.13 eV was successfully constructed using a visible-light-harvesting anthracene-based bipyridine ligand. The as-prepared MOF demonstrates high chemical stability and could be stable in the pH range 2–13, which is favorable for its potential application in photocatalysis. Photocatalytic experiments demonstrate that this Cu­(I)-MOF exhibits high reactivity for reduction of Cr­(VI) in water, with 95% Cr­(VI) converting to Cr­(III) in 10 min by using MeOH as scavenger under visible-light illumination. Furthermore, this MOF could behave as a highly active photocatalyst for H2 evolution without additional photosensitizers and cocatalyst. Remarkably, the as-prepared MOF shows enhanced photocatalytic Cr­(VI) reduction and H2 evolution performances compared with the pristine light-harvesting ligand under the same conditions. In connection to these, the photocatalytic reaction mechanism has also been probed.