Fenton-like chain reactions by coupling nanoscale tungsten powders and peroxydisulfate: Performance and mechanistic insights.

In this study, Fenton-like chain reaction is constructed by coupling nanoscale tungsten powders (nW0) and peroxydisulfate (PDS). The nanoscale tungsten powders/peroxydisulfate (nW0/PDS) system exhibits a high oxidation efficiency toward diverse pollutants and expands the effective pH range up to 9.8. Results reveal •OH and sulfate radical (SO 4 •−) were confirmed to be responsible for 4,4′-ethylidenebisphenol (EBP) degradation, especially •OH. The corrosion process of nW0 results in the in-situ production of H 2 O 2 and the transient-state tungsten species (W (x, x < VI)), initiating the reaction of H 2 O 2 and tungsten species to generate •OH. PDS can accelerate nW0 corrosion to enhance the Fenton-like reaction, and can be activated by tungsten species (nW0 and W (x, x < VI)) to produce •OH and SO 4 •−. Integrated the analysis results of LC-QTOF-MS/MS, EBP degradation pathways were proposed. This study reveals the high oxidation efficiency over a wide pH range in the nW0/PDS system and provides new insight into the tungsten species induced Fenton-like reaction. [Display omitted] • The nW0/PDS system exhibits high oxidation efficiency over a wide pH range. • The stepwise oxidation between nW0 and dissoved oxygen in-situ produces H 2 O 2. • •OH and SO 4 •− are generated by the tungsten species induced Fenton-like reaction. • PDS accelerates the corrosion of nW0 and the Fenton-like reaction. • Degradation process of EBP was proposed based on LC-QTOF-MS/MS results. [ABSTRACT FROM AUTHOR]