Amino-Assisted NH-UiO-66 Anchored on Porous g-CN for Enhanced Visible-Light-Driven CO Reduction.

Constructing heterostructured photocatalysts is an efficient method to improve photocatalytic carbon dioxide (CO) reduction. Herein, holey g-CN (HGN) with rich amino groups (-NH) was hybridized with NH-UiO-66 (NUZ) via a facile in situ growth method. NUZ nanocrystals were anchored on HGN via NHx-Zr-O chemical bonding, leading to the uniform dispersion and avoiding the leaching of NUZ, thus showing excellent stability in photocatalysis. The chemically bonded interfacial charge transfer effect originated from the NHx-Zr-O formation efficiently accelerated the separation and migration of charge carriers, improving the photoactivity. Benefiting from the NHx-Zr-O formation, the optimized NUZ/HGN-35% heterojunctions exhibited outstanding activity in the photoreduction of CO to CO (31.6 μmol g h), which was about 2 and 3 times higher than that of pure NUZ and HGN under visible-light irradiation. This study is expected to provide useful insights for constructing composites with strong interaction for CO reduction, H production, and N reduction.