The introduction of metal single atoms (SAs) and nanoparticles (NPs) are effective approaches to modify electronic configuration of semiconductors, whereas recognizing the synergistic effects of metal SAs and NPs are still challenging in photocatalytic water purification. Herein, a general strategy is achieved by subsequentially anchoring Fe SAs and Fe NPs in graphitic carbon nitride. The modification of Fe SAs and Fe NPs improves the energy band structure and constructs a gradient charge polarization, directly expanding the optical absorption range and facilitating the efficient separation and transfer of charge carriers. With the assistance of the gradient charge polarization, pollutants are readily oxidated by h+, which strengthens the continuous reduction of O2 on Fe NPs for pollutant oxidation in water. This work reinforces the synergistic effect of SAs and NPs on electronic configuration modulation at the atomic level, which exhibits great potential for the construction of an efficient and sustainable water purification system.

中文翻译：

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Fe 单原子和 Fe 纳米颗粒调节光催化水处理电子构型的协同作用


金属单原子 （SAs） 和纳米粒子 （NPs） 的引入是改变半导体电子构型的有效方法，而在光催化水净化中，认识到金属 SAs 和 NPs 的协同作用仍然具有挑战性。在此，通过将 Fe SA 和 Fe NP 依次锚定在石墨氮化碳中来实现一般策略。Fe SAs 和 Fe NPs 的改性改善了能带结构并构建了梯度电荷偏振，直接扩大了光吸收范围，促进了电荷载流子的高效分离和转移。在梯度电荷极化的帮助下，污染物很容易被 h+ 氧化，这加强了 Fe NPs 上 O2 的连续还原，从而促进了水中污染物的氧化。这项工作加强了 SAs 和 NPs 在原子水平上对电子构型调制的协同作用，这在构建高效和可持续的水净化系统方面具有巨大潜力。