The potassium and iodine co-doping combined with a mesoporous structure for developing a novel g-C₃N₄-based photocatalyst is constructed. The K and I co-doped mesoporous g-C₃N₄ has been successfully synthesized via the one pot thermal polymerization of a mixture consisting of dicyandiamide, KI, and SBA-15 used as the hard template. It is shown that this photocatalyst consists of short rod-like network with plenty of pores openings into their surfaces. The mesoporous structure and the doping with K and I in it have been verified by several techniques. For this photocatalyst, a blue shift of the optical absorption band edge induced by the mesoporous structure is compensated for by the red shift originated from the co-doping with K and I. This photocatalyst exhibits the longest life time of carries, the fastest charge transport, and the highest photocurrent density as compared with the mesoporous g-C₃N₄ and the K and I co-doped one. It is revealed a synergistic effect between the formation of the mesoporous structure and the co-doping with K and I. The synergistic effect make the K and I co-doped mesoporous g-C₃N₄ photocatalyst achieves a high hydrogen evolution rate of 80.58 μmol/h, 9.7 times as high as that for pristine g-C₃N₄. These results may shed light on the integration of different modification strategies for developing novel g-C₃N₄-based photocatalysts with much enhanced photocatalytic activity.

中文翻译：

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钾和碘共掺杂介孔石墨质氮化碳的光催化产氢性能增强

构建了钾和碘共掺杂与介孔结构相结合以开发新型的基于gC ₃ N ₄的光催化剂。K和I共掺杂介孔gC ₃ N ₄已通过一锅热聚合成功合成了由双氰胺，KI和SBA-15组成的混合物用作硬模板。结果表明，这种光催化剂由短的棒状网络组成，在其表面上开有许多孔。介孔结构以及其中的K和I掺杂已通过多种技术进行了验证。对于这种光催化剂，由介孔结构引起的光吸收带边缘的蓝移被与K和I共同掺杂产生的红移所补偿。这种光催化剂具有最长的载带寿命，最快的电荷传输，与中孔gC ₃ N ₄相比，光电流密度最高我和K共同掺杂了一个 揭示了介孔结构的形成和与K和I的共掺杂之间的协同作用。该协同作用使K和I共掺杂的介孔gC ₃ N ₄光催化剂实现了80.58μmol/ h的高氢析出速率。 h，是原始gC ₃ N _4的9.7倍。这些结果可能为开发新的基于gC ₃ N ₄的光催化活性大大增强的新型光催化剂的不同修饰策略的整合提供了启示。