The Degradation of Bisphenol Af in Solar Light Assisted Periodate Process Based on Pristine Zno

In this study, zinc oxide (ZnO)-mediated sunlight activation of periodate (IO4-) technology was developed to degrade bisphenol AF (BPAF). Under the optimal reaction condition of 0.65 g/L ZnO, 0.5mM IO4- and pH 5.5, the superior removal rate of BPAF (20 µM) about 96.1% was achieved just within 40 min. The potential reactive oxygen species were hydroxyl radical (·OH), superoxide radical (O2·-) and singlet oxygen (1O2) by free radicals scavenging studies and electron spin resonance (ESR) spectroscopy. Moreover, the present of the targeted pollutant significantly raises the iodate (IO3-) content in the solution, suggesting that iodyl radical (IO3·) may be partly involved in the degradation process. A series of separate experiments indicated that about 20.4% of BPAF was degraded by photodegradation under visible light (UV-blocked solar light) driving, of which O2·-, 1O2 and IO3· were main contributors. This behavior is interpreted as a photodegradation mechanism similar to that of dye sensitization. Meanwhile, the oxidation intermediates of BPAF were qualitatively analyzed and identified via ultra-high performance liquid chromatograph-mass spectrometry (UHPLC-MS), and possible reaction pathways were proposed. Finally, the effects of some Influencing parameters including ZnO dosage, IO4- concentration, initial pH value and common inorganic anions (nitrate (NO3-), chloride (Cl-), carbonate (CO32-) as well as phosphate (H2PO4-)) on the BPAF degradation were also investigated