Enhanced Fe(III)/Fe(II) Redox Cycle for Persulfate Activation by Reducing Sulfur Species

The activation of persulfate (PS) by Fe(III) for the removal environmental organic pollutants was severely limited low reduction rate from to Fe(II). In present study, we reported that reducing sulfur species (i.e., SO32−, HSO3−, S2−, and HS−) under concentration could significantly accelerate Fe(III)/Fe(II) cycle in Fe(III)/PS system. Under condition 1.0 mM 4.0 PS, performance system poor, only 21.6% BPA removed within 40 min. However, degradation efficiency increased 66.0%, 65.5%, 72.9% 82.7% with addition HS−, respectively. highly dependent on solution pH species. When reductant excessive, would be inhibited due elimination reactive This study provided some valuable insights treatment wastewater containing these inorganic ions.