Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 58(1), P. 432 - 439

Published: Dec. 18, 2023

Reactive oxygen species (ROS) are widespread in nature and play central roles numerous biogeochemical processes pollutant dynamics. Recent studies have revealed ROS productions triggered by electron transfer from naturally abundant reduced iron minerals to oxygen. Here, we report that pyrite oxidation exhibit a high facet dependence. Pyrites with various compositions displayed distinct efficiencies producing superoxide (O2• –), hydrogen peroxide (H2O2), hydroxyl radical (•OH). The 48 h •OH production rates varied 3.1-fold 11.7 ± 0.4 36.2 0.6 nM h–1, showing strong correlation the ratio of {210} facet. Such dependence primarily stems different surface electron-donating capacities (2.2–8.6 mmol e– g–1) kinetics (from 1.2 × 10–4 5.8 s–1) faceted pyrites. Further, Fenton-like activity also 10.1-fold variations among pyrites, contributing depedence productions. can greatly affect ROS-driven transformations. As paradigm, degradation carbamazepine, phenol, bisphenol A 3.5–5.3-fold pyrites compositions, where were good agreement ratio. These findings highlight crucial role composition determining subsequent reactions during mineral oxidation.

Language: Английский