ArticleEnvironmental science & technology2026
pH-Dependent Activation of EPFRs and Kinetics of Hydroxyl Radical Generation.
Article in Environmental science & technology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Environmentally Persistent Free Radicals (EPFRs) pose potential environmental and health risks, yet their behavior remains insufficiently characterized. This study investigates the influence of pH on EPFRs activation during redox cycling, focusing on their capacity to generate hydroxyl radicals (•OH). We hypothesized and confirmed that EPFRs environmental stability is enhanced under low pH conditions, whereas higher pH accelerates their redox activity. A model EPFRs system was employed, consisting of 0.25% copper oxide (CuO) as the transition metal center and 2-monochlorophenol (MCP) as the organic precursor, supported on amorphous silica (Cabosil). Hydroxyl radical production was quantified via DMPO spin trapping across a buffered pH range of 5.5-9.0 at redox cycling intervals of 15, 30, 60, 120, 180, and 300 min. Results revealed that •OH yield per EPFRs (•OH/EPFR) was significantly different on both pH and time (
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