The Role of Free‐Radical Pathway in Catalytic Dye Degradation by Hydrogen Peroxide on the Zr‐Based UiO‐66‐NH ₂ MOF

Abstract

Abstract The role of free‐radical species in catalytic oxidative decomposition of thioether utilizing UiO‐66‐NH 2 Zr‐MOF/H 2 O 2 system is highlighted. In contrast to other examples of Zr‐MOF‐mediated oxidation of organic sulfur by H 2 O 2 , the amino‐functionalized UiO‐66‐NH 2 clearly demonstrates nearly quantitative decomposition and excellent recyclability for 10 consecutive cycles without any detectable loss of activity. Several characterization techniques revealed the maintained structural stability of the UiO‐66‐NH 2 MOF even after prolonged utilization. The data presented here clearly demonstrates involvement of free‐radical species as inferred from EPR spectroscopy, which proposes a more comprehensive mechanism involving catalytic activation of H 2 O 2 on Zr‐oxoclusters aided by the amine‐centered holes.