Methylene blue degradation by the VUV/UV/persulfate process: Effect of pH on the roles of photolysis and oxidation.

ABSTRACT: This study investigated methylene blue (MB) degradation by the vacuum-ultraviolet/ultraviolet/persulfate (VUV/UV/PS) process using a mini-fluidic VUV/UV photoreaction system. Results show that MB degradation by the VUV/UV/PS process was significantly higher than that of the conventional UV/PS process, as the VUV photolysis of H₂O and PS generated more reactive oxygen species (ROSs). HO^• and SO₄^•-, identified as the main ROSs, were mostly consumed by dissolved organic carbon and Cl^‒ in real waters, respectively. Additionally, the impacts of solution pH and the concentrations of PS, humic acid, and inorganic ions (HCO₃^‒, Cl^‒, NO₃^‒, SO₄^2‒, Fe(II), and Fe(III)) we

SUBMITTER: Wen D 

PROVIDER: S-EPMC7127383 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature