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Significantly accelerated degradation of naproxen by reduction and complexation coupling in a Cu0/PMS system
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DOI：10.1016/j.dwt.2026.101735.png)
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Abstract
En 中文
Cu-0-activated peroxymonosulfate (PMS) is a promising advanced oxidation process for the removal of pharmaceuticals and personal care products, yet its performance is often limited by inefficient Cu(II)/Cu(I) redox cycling as well as the low steady-state availability of reactive copper species. Here, we constructed a Cu(0)HA/NCP/PMS system by integrating hydroxylamine as a reductant and neocuproine as a Cu(I)-complexing ligand to intensify naproxen degradation and investigate the underlying activation pathway. Under typical conditions, the synergistic combination of HA and NCP caused NPX removal to enable 98.57% within 6 min. This is significantly higher than those in Cu-0/PMS, Cu-0/NCP/PMS, and Cu-0/HA/PMS. The system maintained high efficiency across pH 3.0 similar to 7.0. Scavenging tests and nitrobenzene probing indicated that (OH)-O-center dot/SO4 center dot- pathways were not dominant, whereas benzoic acid caused only moderate inhibition, collectively supporting a non-radical pathway. Spectroscopic and LC-MS evidence revealed a ligand-stabilized high-valent copper oxidant, with characteristic absorption at 358 nm and a signal at m/z 479 assigned to [Cu(III)-(NCP)(2)](3+). This work provides a mechanistically grounded reduction and complexation strategy to overcome Cu-based persulfate activation bottlenecks and achieve rapid, pH-resilient degradation of NPX.
Keywords:
Zero-valent copper
Peroxymonosulfate
PPCPs
Reduction and complexation coupling
Fenton-like system
Journal
D
IF:
1
Papers:
468
Citations:
2.1W
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