Photo-Fenton advanced oxidation process has received intense attention since it can exert the synergistic effect of photocatalysis and Fenton reaction. Herein, 2D/2D α-FeO/g-CN S-scheme heterojunctions were successfully fabricated and applied in photo-Fenton degrading tetracycline hydrochloride (TC). The crystalline phases, morphologies, microstructures, textural structures and optical properties of as-prepared heterojunctions were thoroughly characterized. By comparison and optimizing, the 5.26 wt% 2D/2D α-FeO/g-CN heterojunction exhibited the best photo-Fenton catalytic activity for TC degradation. The outstanding photo-Fenton catalytic performance could be ascribed to the efficient separation and utilization of photogenerated charges by an S-scheme transfer route, as well as accelerating the cycle of Fe/Fe. The active species trapping tests, photoluminescence (PL) spectra, electron spin resonance (ESR) measurements and density functional theory (DFT) calculations were implemented, which not only evidenced that the hydroxyl radicals (·OH), superoxide radicals (·O) and holes (h) were all involved in the photo-Fenton reaction, but also further corroborated the S-scheme charge transfer mechanism. Additionally, the possible degradation pathways of TC were reasonably proposed by the high-performance liquid chromatography mass spectrometry (LC-MS) analytic results. This current work provided an insight into the construction of 2D/2D S-scheme heterojunction photo-Fenton catalysts for environment remediation.

中文翻译：

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锚定在 2D g-C3N4 上的 2D α-Fe2O3 对四环素降解具有优异的光芬顿活性：S 型异质结机制和加速 Fe3+/Fe2+ 循环


光-Fenton高级氧化工艺因其能发挥光催化与Fenton反应的协同效应而受到广泛关注。在此，成功制备了2D/2D α-FeO​​/g-CN S型异质结并将其应用于光芬顿降解盐酸四环素（TC）。对所制备的异质结的晶相、形貌、微观结构、织构结构和光学性质进行了彻底的表征。通过比较和优化，5.26 wt% 2D/2D α-FeO​​/g-CN异质结表现出最佳的TC降解光芬顿催化活性。出色的光芬顿催化性能可归因于通过S型转移途径有效分离和利用光生电荷，以及加速Fe/Fe的循环。进行了活性物质捕获测试、光致发光（PL）光谱、电子自旋共振（ESR）测量和密度泛函理论（DFT）计算，不仅证明了羟基自由基（·OH）、超氧自由基（·O）和空穴(h)均参与了光芬顿反应，也进一步证实了S型电荷转移机制。此外，通过高效液相色谱质谱（LC-MS）分析结果合理提出了TC可能的降解途径。目前的工作为构建用于环境修复的 2D/2D S 型异质结光芬顿催化剂提供了见解。