辐照度
可见光谱
超纯水
阳光
试剂
化学
作用谱
环境化学
光化学
太阳辐照度
环境科学
环境工程
材料科学
光学
光电子学
大气科学
物理
物理化学
作者
Rosa Mosteo,Angélica Varón López,David Muzard,Norberto Benítez,Stefanos Giannakis,C. Pulgarín
出处
期刊:Water Research
[Elsevier]
日期:2020-05-01
卷期号:174: 115636-115636
被引量:44
标识
DOI:10.1016/j.watres.2020.115636
摘要
The aim of this research is to clarify the contribution of sunlight wavelengths, irradiance and Fe2+/H2O2 during bacterial disinfection by the photo-Fenton process in clear surface waters. We considered different solar spectrum distributions (visible, UVA-Visible), sub-critical irradiances (0-400 W/m2), focusing on the action modes of E. coli inactivation by the constituents involved in the composite process, at low μM reactants concentration (Fe2+/H2O2) in in ultrapure (MQ) water. We report that solar disinfection improved with Fenton reagents (photo-Fenton process) is a reality from very low light irradiance values (200 W/m2), and made possible even without the presence of UVA radiation, even when using low quantities of the Fenton reagents (0.5 mg/L Fe2+, 5 mg/L H2O2). Under light exposure, H2O2 was found to augment the intracellular Fenton process and Fe2+ to initiate further, distinct oxidative actions. Finally, validation was performed in Lake Geneva water over a wider irradiance range, where the photo-Fenton process was found to be reagent-dependent in low irradiance, shifting to light-driven in the higher values.
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