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Abstract

Two series of novel carbon nitride photocatalysts, Rho-CN (“Rhodizonate-doped Carbon Nitride”) and Rho-CN-TC (Rho-CN treated in potassium thiocyanate melt), are synthesized in a multi-step fashion via copolymerization of cyanamide with potassium rhodizonate. The formed ionic carbon nitrides are composed of poly(triazine imide) (PTI/Li⁺Cl^-) and potassium poly(heptazine imide) (K-PHI) phases and provide a broad absorption range up to 800 nm. The photocatalysts were characterized by several techniques (including DRUV-Vis, PXRD, FT-IR, SEM and electrochemical methods) and studied in a series of photocatalytic reactions, including red light-promoted benzylamine oxidation, dual photoredox/nickel C-N cross coupling and hydrogen peroxide evolution. The optimal ratio of rhodizonate dopant in its mixture with cyanamide was found to be 0.5% mol. The performance of the newly synthesized materials is comparable to the activities of the benchmark catalysts K-PHI and CN-OA-m (defective poly(heptazine imide) doped with oxamide), while not requiring more expensive nitrogen sources for preparation, like 5-aminotetrazole, or multiple oven cycles. This article is protected by copyright. All rights reserved.