ZnO grafted amorphous Fe₂O₃ matrix (ZnO/Fe₂O₃) was coupled with g-C₃N₄ to synthesize heterojunction photocatalysts with a loosened multilayered structure. The ZnO/Fe₂O₃/g-C₃N₄ exhibited enhanced photocatalytic performance in the degradation of sulfamethazine under visible-light irradiation (λ > 420 nm), with an optimum photocatalytic degradation rate approximately 3.0, 2.4 times that of pure g-C₃N₄ and binary ZnO/g-C₃N₄. Moreover, the target sulfonamides spiked in actual surface water samples could be efficiently photodegraded by ZnO/Fe₂O₃/g-C₃N₄ after 8 h of irradiation, demonstrating its practical potential. An amorphous Fe₂O₃-mediated Z-scheme mechanism was proposed for the charge transfer at the heterojunction surface, which involved a Fe(III)/Fe(II) oxidation-reduction center that favored the retarded charge recombination and improved photocatalytic activity. Such a mechanism was well supported by the direct detection of surface generated O₂⁻ and OH reactive species. Finally, detailed transformation pathways were proposed based on the photodegradation products identified by QToF-MS analyses. This work provides an illustrative strategy for developing efficient Z-scheme photocatalysts for water purification, by taking advantage of amorphous Fe-based oxides in the semiconductor lattice matching.

将ZnO接枝的非晶Fe ₂ O ₃基体（ZnO / Fe ₂ O ₃）与gC ₃ N ₄偶联，以合成具有疏松多层结构的异质结光催化剂。ZnO / Fe ₂ O ₃ / gC ₃ N ₄在可见光照射下（λ> 420 nm）对磺胺二甲嗪的降解表现出增强的光催化性能，最佳光催化降解率约为纯gC ₃ N的3.0倍，为2.4倍₄和二元ZnO / gC ₃ N ₄。而且，在实际地表水样品中加标的目标磺酰胺可以在辐照8 h后被ZnO / Fe ₂ O ₃ / gC ₃ N ₄有效降解。提出了一种非晶态的Fe ₂ O ₃介导的Z-方案用于异质结表面上的电荷转移，该机理涉及Fe（III）/ Fe（II）的氧化还原中心，该中心有利于延迟的电荷重组和改善的光催化活性。这种机制是由良好的直接检测表面的支撑生成ö ₂ ^-和OH反应性物质。最后，根据QToF-MS分析确定的光降解产物，提出了详细的转化途径。这项工作为通过在半导体晶格匹配中利用基于非晶铁的氧化物开发用于水净化的高效Z型光催化剂提供了一种说明性策略。