Although Fe-based catalysts for peroxymonosulfate (PMS) activation for environmental remediation are effective, the poor regeneration of ferric (Fe (III)) to ferrous ions (Fe (II)) in conventional Fe-based catalysts compromises the durability of PMS activation. Given this, an iron-doped molybdenum disulfide MoS₂ (Fe-MoS₂) catalyst was prepared via a one-step hydrothermal method, and it was demonstrated to sustain PMS activation for removing tetracycline hydrochloride (TCH) from aqueous solution under visible-light irradiation. The as-prepared Fe-MoS₂ catalysts feature dual metallic active sites of Fe and Mo atoms to enhance photoelectrons production from MoS₂ for Fe (II) regeneration, thereby preventing iron leakage. Moreover, the Fe-MoS₂ catalysts exhibited good recyclability, enabling multiple cycles of TCH degradation in the presence of PMS under the irradiation of visible-light. In addition, we confirmed that the generated radicals (SO₄^•−, O₂^•−, and •OH) and non-radical species (¹O₂ and h⁺) were responsible for TCH degradation. We also determined critical intermediates during TCH degradation and proposed TCH degradation pathways. This study develops a high-performance Fe-doped MoS₂ photocatalyst for PMS activation and paves the way for leveraging dual metallic sites on catalysts for enhancing water purification.

尽管用于环境修复的过氧单硫酸盐 (PMS) 活化的 Fe 基催化剂是有效的，但在传统的 Fe 基催化剂中，三价铁 (Fe (III)) 再生为亚铁离子 (Fe (II)) 的效果不佳，影响了 PMS 活化的持久性。鉴于此，采用一步水热法制备了一种铁掺杂二硫化钼 MoS ₂ (Fe-MoS ₂ ) 催化剂，并证明了该催化剂在可见光下可维持 PMS 活化以去除水溶液中的盐酸四环素 (TCH)。辐照。所制备的 Fe-MoS _{2催化剂具有 Fe 和 Mo 原子的双金属活性位点，以增强 MoS 2}的光电子产生用于Fe（II）再生，从而防止铁泄漏。此外，Fe-MoS ₂催化剂表现出良好的可回收性，能够在可见光照射下在 PMS 存在下进行多循环 TCH 降解。此外，我们证实生成的自由基（SO ₄ ^•-、O ₂ ^•-和•OH）和非自由基物质（¹ O ₂和h ⁺）是造成TCH降解的原因。我们还确定了 TCH 降解过程中的关键中间体，并提出了 TCH 降解途径。本研究开发了一种高性能的 Fe 掺杂 MoS ₂用于 PMS 活化的光催化剂，并为利用催化剂上的双金属位点增强水净化铺平了道路。