查看文章

In this study, we demonstrate that ascorbic acid (AA) exhibited extremely high activity on persulfate (PS) activation (AA/PS) to produce SO₄^{radical dot−} and radical dotOH for the degradation of various organic pollutants, including atrazine, pentachlorophenol, alachlor, tetracycline, and chloramphenicol. Taken atrazine as a model natural organic micropollutants, we surprisingly found that the degradation rate constant of atrazine during PS activation in presence of AA was about 29 times larger than that in the absence of AA. The underlying mechanism of persulfate activation induced by AA was then systematically investigated by electron spin resonance (ESR) analysis, theoretical density functional theory (DFT) calculations, and kinetic experiments. The combination of ESR and DFT results confirmed that the persulfate activation induced by ascorbic acid was attributed to the electron transfer from AA to PS. In this …