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Water-Soluble Polymeric Carbon Nitride Colloidal Nanoparticles for Highly Selective Quasi-Homogeneous Photocatalysis

Krivtsov, Igor; Mitoraj, Dariusz; Adler, Christiane; Ilkaeva, Marina; Sardo, Mariana; Mafra, Luis; Neumann, Christof; Turchanin, Andrey; Li, Chunyu; Dietzek, Benjamin; Leiter, Robert; Biskupek, Johannes; Kaiser, Ute; Im, Changbin; Kirchhoff, Björn; Jacob, Timo; Beranek, Radim
in: Angewandte Chemie-International Edition (2020) 487

Heptazine-based polymeric carbon nitrides (PCN)are promising photocatalysts for light-driven redox transformations. However, their activity is hampered by low surface area resulting in low concentration of accessible active sites. Herein, we report a bottom-up preparation of PCN nanoparticles with a narrow size distribution (ca. 10_3 nm), which are fully soluble in water showing no gelation or precipitation over several months. They allow photocatalysis to be carried out under quasi-homogeneous conditions. The superior performance of water-soluble PCN compared to conventional solid PCN, is shown in photocatalytic H2O2 production via reduction of oxygen accompanied by highly selective photooxidation of 4-methoxybenzyl alcohol and benzyl alcohol or other lignocellulose-derived feedstock (ethanol, glycerol, glucose).The dissolved photocatalyst can be easily recovered and re-dissolved by simple modulation of the ionic strength of the medium, without any loss of activity and selectivity.

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