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Citation: Xinxin YU, Yongxing LIU, Xiaohong YI, Miao CHANG, Fei WANG, Peng WANG, Chongchen WANG. Photocatalytic peroxydisulfate activation for degrading organic pollutants over the zero-valent iron recovered from subway tunnels[J]. Chinese Journal of Inorganic Chemistry, ;2025, 41(5): 864-876. doi: 10.11862/CJIC.20240438 shu

Photocatalytic peroxydisulfate activation for degrading organic pollutants over the zero-valent iron recovered from subway tunnels

  • 1.

    Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation, Beijing University of Civil Engineering and Architecture, Beijing 100044, China

  • 2.

    Key Laboratory of Urban Stormwater System and Water Environment, Ministry of Education, Beijing University of Civil Engineering and Architecture, Beijing 100044, China

Figures(10)

  • Particulate matters collected from subway tunnels, were identified as predominant zero-valent iron (ZVI) via powder X ray diffraction and X ray photoelectron spectroscopy, which was innovatively adopted to activate peroxodisulfate (PDS) for degrading organic dye pollutants. The as-obtained ZVI exhibited exceptional catalytic performance under diverse light sources, including low-power LED ultraviolet light (UVL), visible light (VL), and real solar light (SL), achieving complete rhodamine B (RhB, 10.0 mg·L-1) degradation within 2.0 min. Radical quenching experiments confirmed the synergistic roles of sulfate radicals (SO4·-), hydroxyl radicals (·OH), superoxide radicals (·O2-), and holes (h+). Systematic parametric studies revealed that boosted RhB removal efficiencies were accomplished across a wide pH range (2.0-10.0), in the presence of common interfering ions (Cl-, SO42-, HCO3-, H 2PO4-, and NO3-), humic acid, and real water matrices, demonstrating remarkable environmental adaptability. Notably, ZVI maintained high catalytic activity even under complicated aqueous conditions, underscoring its resistance to matrix influence. The magnetic properties of ZVI enabled its facile recovery and reuse for multiple cycles without significant performance loss, aligning with sustainable resource utilization principles. This study not only presents a cost-effective strategy for valorizing urban particulate waste but also advances solar-driven advanced oxidation processes (AOPs) for practical water treatment applications.
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