The UV/chlor(am)ine and UV/permanganate processes are emerging advanced oxidation processes (AOPs) that produces both hydroxyl radical (HO*) and emerging reactive species, i.e., reactive chlorine species (RCS) or reactive manganese species (RMnS). However, the roles of these emerging reactive species for the abatement of micropollutants were largely unknown, due to the lack of identification methods and the unknowns of their reactivity toward most micropollutants. We developed the identification methods by using kinetic modeling and chemical probes to quantify the concentrations of reactive species. Then the roles of specific reactive species for the abatement of target micropollutants were differentiated with respects to kinetics and mechanisms. In UV/chlorine, RCS such as Cl*, Cl2*− and ClO*, played an essential role in the abatement of a variety of micropollutants, particularly those containing electron donating groups, which was verified by a good linear relationship between the RCS reactivity and negative values of the Hammett constant for aromatic pollutants. In UV/chloramine, besides HO* and RCS, the role of reactive nitrogen species (RNS) such as nitrogen oxide (*NO) was also proved to be very important. For UV/permanganate, we firstly reported the activation of permanganate by UV irradiation for the abatement of micropollutants, which may lead to a new advanced oxidation process relying on both HO* and RMnS. The production of HO* and emerging reactive species makes UV/chlor(am)ine and UV/permanganate processes AOPs more compatible for pollution control.

Roles of emerging reactive species in UV/chlor(am)ine and UV/permanganate processes

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

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