摘要：SummaryOxidative water purification of micropollutants (MPs) can proceed via toxic intermediates calling for procedures for connecting degrading chemical mixtures to evolving toxicity. Herein, we introduce a method for projecting evolving toxicity onto composite changing pollutant and intermediate concentrations illustrated through the TAML/H2O2mineralization of the common drug and MP, propranolol. The approach consists of identifying the key intermediates along the decomposition pathway (UPLC/GCMS/NMR/UV-Vis), determining for each by simulation and experiment the rate constants for both catalytic and noncatalytic oxidations and converting the resulting predicted concentration versus time profiles to evolving composite toxicity exemplified using zebrafish lethality data. For propranolol, toxicity grows substantially from the outset, even after propranolol is undetectable, echoing that intermediate chemical and toxicity behaviors are key elements of the environmental safety of MP degradation processes. As TAML/H2O2mimics mechanistically the main steps of peroxidase catalytic cycles, the findings may be relevant to propranolol degradation in environmental waters.Graphical AbstractDisplay OmittedHighlights•TAML(s) catalyzed H2O2mineralization of persistent micropollutant propranolol•Major intermediates kinetically characterized for catalytic and noncatalytic reactions•Method introduced quantifying evolving composition and toxicity of process solution•Toxicity grew after complete propranolol removal—toxicity data gap highlightedChemical Engineering; Environmental Chemical Engineering; Green Chemistry; Environmental Chemistry
