Sulfide-modified zero-valent iron (S-Fe⁰) is regarded as a promising method to enhance the catalytic activity of Fe⁰ for peroxymonosulfate (PMS) activation. However, the roles of sulfidation and the application of the sulfidation treatment method are worth to further investigation. In our study, the effects of the S/Fe ratio, Fe⁰ dosage, and initial pH on sulfadiazine (SDZ) removal were investigated. The characterization of S-Fe⁰ with SEM, XPS, contact angle and Tafel analysis confirmed that the formation of sulfur species on the Fe⁰ surface could enhance the catalytic performance of Fe⁰. S²⁻ played the major role and SO₃^2- played the minor role in accelerating the conversion of Fe³⁺ to Fe²⁺. EPR tests, radical quenching and quantitative determination experiments identified ^•OH as playing the major role and SO₄^•− also playing an important role in SDZ removal in S-Fe⁰/PMS system. Sulfidation produced no notable change in the role of ^•OH and SO₄^•−. A possible degradation pathway of SDZ was proposed. Effect of sulfidation on various sizes of Fe⁰ was also studied which demonstrated that the smaller sizes of Fe⁰ (< 8 µm) were more effective in the sulfidation method treatment. S-Fe⁰/PMS system also showed a good performance in removing antibiotics in natural fresh water.

硫化物改性的零价铁 (S-Fe ⁰ ) 被认为是一种很有前景的方法，可以提高 Fe ⁰对过硫酸盐 (PMS) 活化的催化活性。然而，硫化的作用和硫化处理方法的应用值得进一步研究。在我们的研究中，研究了 S/Fe 比、Fe ⁰剂量和初始 pH 值对磺胺嘧啶 (SDZ) 去除的影响。S-Fe的表征⁰用SEM，XPS，接触角和塔菲尔分析证实硫物种中的Fe的形成⁰表面可以提高Fe的催化性能⁰。S ²⁻起主要作用，SO ₃ ^2-对加速Fe ³⁺向Fe ²⁺的转化起次要作用。EPR 测试、自由基淬火和定量测定实验确定^• OH 起主要作用，SO ₄ ^•-在 S-Fe ⁰ /PMS 系统中的 SDZ 去除中也起重要作用。硫化作用对^• OH 和 SO ₄ ^•-的作用没有显着变化。提出了 SDZ 可能的降解途径。还研究了硫化对各种尺寸的 Fe ^{0 的}影响，这表明较小尺寸的 Fe ⁰ (< 8 µm) 在硫化方法处理中更有效。S-Fe ⁰/PMS系统在去除天然淡水中的抗生素方面也表现出良好的性能。