Introduction of surface oxygen vacancy (Vo) has been proved to be a powerful method to promote the performance of H₂S selective oxidation by improving H₂S adsorption and O₂ activation. Nevertheless, maximizing the oxygen vacancy concentration remains a challenge due to limited exposed surface. Herein, we report a Fe-doped TiO_2-x ultrathin nanosheet with abundant oxygen vacancies for H₂S selective oxidation via a facile citric acid assisted hydrothermal process. One of the cheapest and most abundant metals, iron, is a desirable dopant for further promoting the H₂S oxidation activity of TiO₂. As a result, the Fe-doped TiO_2-x nanosheets endowed with abundant oxygen vacancies exhibited nearly 100% sulfur selectivity and H₂S conversion at 210 °C and is superior to most reported Ti-based materials. Furthermore, through in situ DRIFTS, in situ Raman and EPR spectra of H₂S oxidation, the reaction pathway in selective oxidation of H₂S is revealed. The density functional theory (DFT) calculation was conducted to get a deeper insight into the effect of Fe-doping on the electronic structure and oxygen vacancy of defected TiO₂.

表面氧空位（VO）的引入已被证明是促进H的性能的有效方法₂通过改善小时秒选择性氧化₂小号吸附和O ₂活化。然而，由于有限的暴露表面，最大化氧空位浓度仍然是一个挑战。在此，我们报告了一种 Fe 掺杂的 TiO _2-x超薄纳米片，其具有丰富的氧空位，可通过简单的柠檬酸辅助水热过程进行 H ₂ S 选择性氧化。铁是最便宜和最丰富的金属之一，是进一步促进TiO ₂的 H ₂ S 氧化活性的理想掺杂剂。因此，Fe 掺杂的 TiO _2-x具有丰富氧空位的纳米片在 210°C 时表现出接近 100% 的硫选择性和 H ₂ S 转化率，并且优于大多数报道的钛基材料。此外，通过H ₂ S氧化的原位漂移、原位拉曼和EPR光谱，揭示了H ₂ S选择性氧化的反应途径。进行密度泛函理论 (DFT) 计算以更深入地了解 Fe 掺杂对缺陷 TiO ₂的电子结构和氧空位的影响。