Citation: Xuejia Li, Yang Liu, Jian Wei, Yujia Xiang, Xinruo Wang, Hanchang Wang, Heng Zhang, Bo Lai. New insight into the role of humic acid in Vis/Fe(Ⅲ)/PDS system: Synergistic effects of complexation and photosensitization[J]. Chinese Chemical Letters, ;2025, 36(10): 110811. doi: 10.1016/j.cclet.2024.110811 shu

New insight into the role of humic acid in Vis/Fe(Ⅲ)/PDS system: Synergistic effects of complexation and photosensitization

Xuejia Li ^{a, b} ,
Yang Liu ^{a, c, d, *,} ,
Jian Wei ^b ,
Yujia Xiang ^{a, c, d} ,
Xinruo Wang ^e ,
Hanchang Wang ^{a, c, d} ,
Heng Zhang ^{a, c, d} ,
Bo Lai ^{a, c, d}

a.
State Key Laboratory of Hydraulics and Mountain River Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China
b.
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
c.
Sino-German Centre for Water and Health Research, Sichuan University, Chengdu 610065, China
d.
Water Safety and Water Pollution Control Engineering Technology Research Center in Sichuan Province, Sichuan University, Chengdu 610041, China
e.
School of Environmental Science, Liaoning University, Shenyang 110036, China

liuyang_scu@scu.edu.cn

Received Date: 13 August 2024
Revised Date: 23 December 2024
Accepted Date: 30 December 2024
Available Online: 31 December 2024

Figures(5)

Humic acid (HA) as a natural reducing ligand was employed to accelerate the Fenton and Fenton-like processes, however, the potential role of photosensitivity was overlooked. This research showed that HA exhibits more significant promotion for levofloxacin (LVF) degradation under light conditions compared to darkness. The study also proposed a mechanism involving complexation and photosensitization interactions. A strong inhibitor of ethylenediaminetetraacetic acid confirmed that the formation of organic-iron complexes was crucial. Firstly, it was proposed that complexed iron has a lower redox potential than free iron, which may be responsible for accelerating electron transfer from iron to peroxydisulfate (PDS). The density functional theory (DFT) calculations confirmed that complexed iron has a lower reaction energy barrier for PDS activation. Additionally, the excited state substances (^*HA and ^*LVF) can transfer electrons to Fe(Ⅲ) and PDS, and the generation of HA/LVF-Fe(Ⅲ)-PDS can accelerate this process. These findings could offer fresh perspectives on the combined elimination of contaminants through natural organic compounds and light exposure.
- HA promotion,
- Complexation,
- Photo-Fenton,
- Thermodynamic feasibility enhancement Photosensitive-LMCT
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