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

摘要

In this study, Fenton-like chain reaction is constructed by coupling nanoscale tungsten powders (nW(0)) and peroxydisulfate (PDS). The nanoscale tungsten powders/peroxydisulfate (nW(0)/PDS) system exhibits a high oxidation efficiency toward diverse pollutants and expands the effective pH range up to 9.8. Results reveal (OH)-O-center dot and sulfate radical (SO4 center dot-) were confirmed to be responsible for 4,4'-ethylidenebisphenol (EBP) degradation, especially (OH)-O-center dot. The corrosion process of nW(0) results in the in-situ production of H2O2 and the transient-state tungsten species (W (x, x VI)), initiating the reaction of H2O2 and tungsten species to generate (OH)-O-center dot. PDS can accelerate nW(0) corrosion to enhance the Fenton-like reaction, and can be activated by tungsten species (nW(0) and W (x, x VI)) to produce (OH)-O-center dot and SO4 center dot-. 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 nW(0)/PDS system and provides new insight into the tungsten species induced Fenton-like reaction.