Chemically modified g-C₃N₄ for the photocatalytic H₂ evolution from water was explored. Bulk g-C₃N₄ was treated in hot HNO₃ aqueous solution to obtain the oxidized material (o-g-C₃N₄), tested in water containing glucose as model water-soluble sacrificial biomass, using Pt as co-catalyst, under simulated solar light. The behaviour of o-g-C₃N₄ was studied in relation with catalyst amount, Pt loading, glucose concentration. Results showed that H₂ production is favoured by increasing glucose concentration up to 0.1 M and Pt loading up to 3 wt%, and it resulted strongly enhanced using small amount of o-g-C₃N₄ (0.25 g L⁻¹). o-g-C₃N₄ possesses superior photocatalytic activity (∼26-fold higher) compared to pristine g-C₃N₄, with H₂ evolution further improved by ultrasound-assisted exfoliation and evolution rates up to ca. 1370 μmol h⁻¹ per gram of catalyst, with excellent reproducibility (RSD < 6%, n = 3). Significant production was observed also in river water and seawater, with results far better (up to ca. 2500 μmol g⁻¹ h⁻¹) compared to commercial AEROXIDE^® P25 TiO₂ under natural solar light.

探索了用于从水中释放出光催化H _2的化学改性gC ₃ N ₄。在热的HNO ₃水溶液中处理块状gC ₃ N ₄，以获得氧化物质（ogC ₃ N ₄），并在模拟太阳光下，使用Pt作为助催化剂，在含葡萄糖的水作为模型水溶性牺牲生物质中进行了测试。研究了ogC ₃ N ₄的行为与催化剂量，Pt负载量，葡萄糖浓度的关系。结果表明，H ₂通过将葡萄糖浓度提高到0.1 M和将Pt负载提高到3 wt％，有利于生产，并且使用少量的ogC ₃ N ₄（0.25 g L ^-1）可以大大提高产量。与原始gC ₃ N ₄相比，ogC ₃ N ₄具有优异的光催化活性（约高26倍），超声辅助剥落可进一步改善H _2的析出，并且析出速率最高可达约20倍。每克催化剂1370μmolh ^-1，具有出色的重现性（RSD <6％，n  = 3）。在河水和海水中也观察到大量产量，结果要好得多（最高约2500μmolg^-1 ħ ^-1）相比于商业AEROXIDE ^® P25的TiO ₂下自然日光。