Gao Jie, Zhang Chaojie, Chu Liquan, Zhao Yunmeng, Zhai Zhenyu, Zhou Xuefei, Zhang Yalei
State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China.
State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China E-mail:
Water Sci Technol. 2024 Dec;90(12):3180-3192. doi: 10.2166/wst.2024.392. Epub 2024 Dec 6.
Hexafluoropropylene oxide trimer acid (HFPO-TA) is an emerging alternative to traditional perfluoroalkyl substances (PFASs), which is characterized by its biotoxicity and persistence. The UV/sulfite/iodide photo-induced hydrated electrons system can effectively degrade HFPO-TA under mild conditions. However, the effects of water quality on this system need to be urgently investigated. This study explored the impact of common aqueous constituents, such as Cl-, HCO3-, PO43- and humic acid (HA) on the defluorination efficiency of HFPO-TA by the UV/sulfite/iodide system. Results indicated that low concentrations of Cl- (<1.0 mM), PO43- (<0.01 mM), and HA (<1.0 mg/L) have little effect on defluorination efficiency. However, as concentrations increase, these constituents can interact with photosensitizers or reactive species within the system, leading to a decrease in defluorination efficiency. HCO3-, in their various solution states, can compete with HFPO-TA for the hydrated electron (eaq-) or engage directly with the photosensitizer, resulting in a hindrance to the defluorination capabilities of the system. Furthermore, it was identified that the components in Xiaoqing River, especially Cl- and HCO3-, could greatly inhibit the defluorination and degradation efficiency of HFPO-TA by the system. Pretreatment such as nanofiltration would effectively mitigate this problem.
六氟环氧丙烷三聚体酸（HFPO-TA）是传统全氟烷基物质（PFASs）的一种新兴替代品，具有生物毒性和持久性。紫外光/亚硫酸盐/碘化物光致水合电子体系能在温和条件下有效降解HFPO-TA。然而，水质对该体系的影响亟待研究。本研究探讨了常见水体成分，如Cl-、HCO3-、PO43-和腐殖酸（HA）对紫外光/亚硫酸盐/碘化物体系降解HFPO-TA脱氟效率的影响。结果表明，低浓度的Cl-（<1.0 mM）、PO43-（<0.01 mM）和HA（<1.0 mg/L）对脱氟效率影响较小。然而，随着浓度增加，这些成分会与体系中的光敏剂或活性物种相互作用，导致脱氟效率降低。不同溶液状态下的HCO3-会与HFPO-TA竞争水合电子（eaq-）或直接与光敏剂结合，从而阻碍体系的脱氟能力。此外，研究发现小清河中的成分，尤其是Cl-和HCO3-，会极大地抑制该体系对HFPO-TA的脱氟和降解效率。纳滤等预处理可有效缓解这一问题。
