Photocatalytic hydrogen production and uranium reduction can solve the problems of energy crisis and environmental pollution. Here, bismuth nanocluster loaded on N-doped porous carbon (Bi/NC) with “memory catalysis” effect was prepared through a Bi-MOF precursor pyrolysis strategy for H generation and UO reduction. The photocatalyst achieved an enhanced H production rate of 12.8 mmol g h and an improved UO removal ratio of 95.9 %, which was 3.2 and 1.8 times as pristine carbon material, respectively. Moreover, both the H generation and UO reduction showed a sustained activity under dark condition. Improved activity is ascribed to the optimized electronic property and the enhanced charge separation in Bi/NC, which can be proved by the DFT calculation of projected density of state, Fermi level and charge density difference. This work provides a new strategy to realize the continuous H generation and U(VI) reduction in day and night.

中文翻译：

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负载在氮掺杂多孔碳上的铋纳米团簇具有“记忆催化”效应，可有效光催化生成氢气和还原铀（VI）

光催化制氢和还原铀可以解决能源危机和环境污染问题。在此，通过Bi-MOF前驱体热解策略制备了具有“记忆催化”效应的负载在氮掺杂多孔碳（Bi/NC）上的铋纳米团簇，用于产生H和还原UO。该光催化剂的H产率提高到12.8 mmol g·h，UO去除率提高到95.9%，分别是原始碳材料的3.2和1.8倍。此外，在黑暗条件下，H的产生和UO的还原均表现出持续的活性。活性的提高归因于 Bi/NC 中优化的电子特性和增强的电荷分离，这可以通过投影态密度、费米能级和电荷密度差的 DFT 计算来证明。这项工作为实现昼夜连续产生H和U(VI)减少提供了新的策略。