Hydroxyl radical formation from bacteria-assisted Fenton chemistry at neutral pH under environmentally relevant conditions

摘要: Environmental context Reactions in natural waters such as lakes and streams are thought to be extremely slow the absence of sunlight (e.g. at night). We demonstrate that presence iron, hydrogen peroxide certain bacteria (all which common waters), reactions may occur surprisingly quickly. These findings will help us predict fate many compounds, including pollutants, night. Abstract Dark Fenton chemistry is an important source hydroxyl radicals (OH•) sunlight. Hydroxyl radical production by this process very bodies water, owing reduction low solubility FeIII neutral near-neutral pH. have investigated effects iron-reducing Shewanella oneidensis (SO) on OH• rates from environmentally relevant (H2O2) iron concentrations In 2.0 × 10–4M H2O2, increased 1.3 10–10 10–10Ms–1 7.0 106cellsmL–1 SO when (at a concentration 100μM) was form FeII, 3.6 10–11 2.2 FeIII. This represents rate increases factors 1.5 6 respectively. measured range H2O2 cell densities. Production depended linearly both variables. also bacteria-assisted can result rapid degradation aromatic pollutants anthracene. Our results suggest contributors formation dark waters.