Add time:07/31/2019         Source:sciencedirect.com

Rhodamine B (RhB) removal in a tungsten species-catalyzed Fenton-like system using nanoscale zero valent tungsten (nZVW) was investigated. The nZVW system can effective remove RhB in oxygenated water, and the nZVW/H2O2 system significantly enhances the RhB removal. Mechanism investigation shows that hydroxyl radical (·OH) is the primary reactive oxidant for removing RhB in both systems. The stepwise oxidation of nZVW can release reactive tungsten species and produce H2O2 by electron transfer from W0 or low valent tungsten species to O2, and ·OH was then formed via a Fenton-like reaction between low valent tungsten species and H2O2. The addition of H2O2 in the nZVW/H2O2 system can increase the RhB removal ratio by accelerating nZVW corrosion and enhancing the Fenton-like reaction. Moreover, higher pH inhibits the RhB removal due to the consumption of reactive tungsten species by OH−, and both higher nZVW and H2O2 dosages can enhance the RhB removal. RhB degradation pathways in the nZVW/H2O2 system are proposed involving N-de-ethylation, chromophore cleavage, ring open, and mineralization. In addition, the present study puts forward a new water treatment technique and contributes to understand the role of tungsten species in advanced oxidation processes.

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