UV/sodium percarbonate (UV/SPC) is an emerging technology not yet been fully investigated for the destruction of organic contaminants in water. This study explored the role of carbonate radical anion (CO3*-) in UV/SPC and the detoxification potential of UV/SPC for bisphenol A (BPA) removal in water. Results show that the degradation rates of BPA in UV/SPC and UV/H2O2 were comparable at equivalent concentration of H2O2. CO3*- was a reactive species other than for BPA degradation in UV/SPC. The second order rate constant of CO3*- towards BPA and the steady state concentrations of CO3*- and hydroxyl radical were determined using competition kinetics. Identified transformation products of BPA suggested that destruction of BPA started with electron transfer, demethylation, and ipso attack. In vivo assays with Escherichia coli (E. coli) show limited impacts of BPA effluents treated with UV/H2O2 and UV/SPC on cell growth, cell cycle, and cell apoptosis. Metabolomic analysis illustrated the impacted metabolite and the metabolic pathways of E. coli grown in matrices containing BPA effluents treated with UV/H2O2 and UV/SPC. UV/SPC displayed an advantage of attenuated impact on citrate cycle with UV irradiation when compared to UV/H2O2 for BPA detoxification.

UV/sodium percarbonate for the degradation of bisphenol A: Role of carbonate radical anion and detoxification potential

ACS Fall 2021

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