NH2-MIL-125/Na掺杂g-C3N4复合S型异质结的构建及其光催化产过氧化氢性能

doi:10.1016/j.actphy.2025.100143

摘要/Abstract

摘要：

异质结构建已被证明是实现高效电荷分离和提高光催化性能的有效策略。在本研究中，基于元素掺杂和异质结构建的协同优化策略，通过简单的浸渍法构建了钛基金属有机框架(NH₂-MIL-125，简称NMT)与钠掺杂氮化碳(Na-CN)复合的S型异质结光催化剂(x% NMT/Na-CN)。通过Na的层内掺杂调节了催化剂的能带结构，引入氮缺陷提高了光生电荷的分离效率。此外，Na-CN与NMT的复合形成了S型异质结，进一步提高了光生电荷的分离效率，同时保留了复合催化剂的强氧化还原能力。得益于Na掺杂和NMT复合的协同效应，15% NMT/Na-CN在异丙醇溶液中的光催化H₂O₂产率高达2474.6 μmol g⁻¹ h⁻¹，未改性块状氮化碳的38倍。这项工作为基于掺杂-异质结协同优化策略实现氮化碳基光催化剂高效生产H₂O₂提供了一种新方法。

关键词: 氮化碳, MOF, 过氧化氢, S型异质结, 掺杂

Abstract:

Heterogeneous structure building has proven to be an effective strategy for achieving efficient charge separation and improving photocatalytic performance. In this study, based on the synergistic optimization strategy of elemental doping and heterostructure construction, an S-scheme heterojunction photocatalyst (x% NMT/Na-CN) composed of titanium-based metal-organic framework (NH₂-MIL-125, abbreviated as NMT) and sodium-doped carbon nitride (Na-CN) was constructed by a simple impregnation method. The energy band structure of the catalysts was modulated by intra-layer doping of Na, which introduced nitrogen defects and improved the separation efficiency of photogenerated charges. In addition, the composite of Na-CN and NMT formed an S-scheme heterojunction, which further improved the photogenerated charge separation efficiency while retaining the strong redox ability of the composite catalyst. Owing to the synergistic effect of Na doping and NMT composite, the photocatalytic H₂O₂ production rate of 15% NMT/Na-CN in isopropanol solution was as high as 2474.6 μmol g⁻¹ h⁻¹, which was 38 times higher than that of unmodified bulk carbon nitride. This work offers a novel approach to realize the efficient production of H₂O₂ from carbon nitride-based photocatalysts based on the doping-heterojunction synergistic optimization strategy.

Key words: Carbon nitride, MOF, Hydrogen peroxide, S-scheme heterojunction, Doping

樊凡, 修浩, 王宇婷, 崔永朋, 王雅君. NH₂-MIL-125/Na掺杂g-C₃N₄复合S型异质结的构建及其光催化产过氧化氢性能[J]. 物理化学学报, 2026, 42(2), 100143. doi: 10.1016/j.actphy.2025.100143

Fan Fan, Hao Xiu, Yuting Wang, Yongpeng Cui, Yajun Wang. Construction of NH₂-MIL-125/Na-doped g-C₃N₄ composite S-scheme heterojunction and its performance in photocatalytic hydrogen peroxide production[J]. Acta Phys. -Chim. Sin. 2026, 42(2), 100143. doi: 10.1016/j.actphy.2025.100143

链接本文: https://www.whxb.pku.edu.cn/CN/10.1016/j.actphy.2025.100143

https://www.whxb.pku.edu.cn/CN/Y2026/V42/I2/100143

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NH₂-MIL-125/Na掺杂g-C₃N₄复合S型异质结的构建及其光催化产过氧化氢性能

Construction of NH₂-MIL-125/Na-doped g-C₃N₄ composite S-scheme heterojunction and its performance in photocatalytic hydrogen peroxide production

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