College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China; Hunan Key Laboratory of Wetland and Soil Ecological Restoration, Central South University of Forestry and Technology, Changsha, 410004, China.
College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China; Hunan Key Laboratory of Wetland and Soil Ecological Restoration, Central South University of Forestry and Technology, Changsha, 410004, China.
Environ Res. 2024 Sep 15;257:119292. doi: 10.1016/j.envres.2024.119292. Epub 2024 May 31.
This study developed a novel process named sulfidated zero-valent iron/peroxymonosulfate/visible light irradiation (S-mZVI/PMS/vis) for enhanced organic pollutant degradation. The S-mZVI/PMS/vis process exhibited remarkable catalytic activity, achieving a 99.6% rhodamine B (RhB) removal within 10 min. The degradation rate constant of RhB by the S-mZVI/PMS/vis process was found to be 6.49 and 79.84 times higher than that by the S-mZVI/PMS and PMS/vis processes, respectively. Furthermore, the S-mZVI/PMS/vis process worked efficiently across a wide pH range (3.0-9.0), and the result of five-cycle experiments demonstrated the excellent reusability and stability of S-mZVI. Radical quenching tests and electron paramagnetic resonance analysis indicated that ·O, O, and h significantly contributed to the degradation of RhB through the S-mZVI/PMS/vis process. The visible light irradiation increased the Fe concentration, improved the Fe/Fe cycle, and consequently enhanced the PMS decomposition, reactive species production, and RhB degradation. This work offers a promising strategy to highly efficiently activate PMS for organic pollutants elimination from aqueous solutions.
本研究开发了一种名为硫化零价铁/过一硫酸盐/可见光辐照（S-mZVI/PMS/vis）的新工艺，用于增强有机污染物的降解。S-mZVI/PMS/vis 工艺表现出显著的催化活性，在 10 分钟内实现了 99.6%的罗丹明 B（RhB）去除。S-mZVI/PMS/vis 工艺对 RhB 的降解速率常数分别比 S-mZVI/PMS 和 PMS/vis 工艺高 6.49 和 79.84 倍。此外，S-mZVI/PMS/vis 工艺在很宽的 pH 范围（3.0-9.0）内都能有效工作，五次循环实验的结果表明 S-mZVI 具有优异的可重复使用性和稳定性。自由基猝灭实验和电子顺磁共振分析表明，·O、O 和 h 通过 S-mZVI/PMS/vis 工艺对 RhB 的降解有重要贡献。可见光辐照增加了 Fe 浓度，改善了 Fe/Fe 循环，从而增强了 PMS 的分解、活性物质的产生和 RhB 的降解。这项工作为高效激活 PMS 以去除水溶液中的有机污染物提供了一种有前途的策略。
