Bibonding Constructing Coordinatively Unsaturated Zni+(0 < i < 2) Sites for Enhanced Photo‐Fenton Activity

Abstract The coordinatively unsaturated metal sites (CUMSs) have attracted widespread attention for enhancing catalytic activity. This study reports a controllable “bibonding” method to construct the coordinatively unsaturated Zn i + (0 < i < 2) active sites by forming N (g‐C3N4) ‐Zn—N (imidazole) under mild experimental conditions. The catalysts with Zn i + are used for the photo‐Fenton reaction to degrade methylene blue (MB) without any oxidant. The degradation efficiency is positively correlated with Zn i + . The Zn i + improved the Fe 2+ /Fe 3+ conversion efficiency and the H 2 O 2 generation ability of the catalyst. The optimized catalysts with 2.27% of Zn i + present a photo‐Fenton degradation efficiency of MB as 73.45 mg g −1 at pH 7 and 78.54 mg g −1 at pH 4. This strategy can be used to construct CUMSs for a series of narrow bandgap semiconductor materials containing nitrogen atoms.