Abatement of Structurally Diverse Micropollutants by the UV/Permanganate Process: Roles of Hydroxyl Radicals and Reactive Manganese Species

The UV/permanganate process was recentlyreported to be an innovative advanced oxidation process (AOP)that generates HO center dot and reactive manganese species (RMnS) ofMn(V). This study further identified that Mn(V) isfirst generatedby UV/permanganate, followed by its transformation into Mn(III)and thefinal production of MnO2. The UV/permanganate processwas effective for the degradation of 26 structurally diversemicropollutants, withkobs ' ranging from 0.05 to 1.8 min-1. HO center dot was active in the degradation of all micropollutants, while Mn(V)was selective toward aromatics containing carboxylic groups. Theroles of Mn(III) and MnO2 formed in situwere not important forthe degradation of micropollutants under neutral conditions;however, under acidic conditions,in situ-formed MnO2was attributable to the abatement of phenolics, anilines, and propranolol as acatalyst of permanganate. HO center dot was scavenged by water matrix components, such as (bi)carbonate, bromide, and natural organicmatter (NOM) while simultaneously forming CO3 center dot-,Br-center dot/Br-2(center dot-), and Mn(III)-NOM complexes that promoted micropollutantdegradation. The electrical energy per order (EE/O) for 90% micropollutant transformation by UV/permanganate was comparablewith that by UV/H2O2 in simulated drinking water. This study comprehensively elucidates the roles of HO center dot and diverse RMnS inmicropollutant degradation by UV/permanganate under practical conditions