Kinetics and mechanism of sulfate radical- and hydroxyl radical-induced degradation of Bisphenol A in VUV/UV/peroxymonosulfate system

The degradation of Bisphenol A (BPA) in the vacuum ultraviolet/ ultraviolet/ peroxymonosulfate (VUV/UV/ PMS) process based on a mini-fluidic VUV/UV photoreaction system has been comprehensively investigated focusing on the degradation performances and kinetics in this study. With 20 min reaction at pH 7.0 in VUV/UV/ PMS process, the removal efficiency and the apparent degradation rate constant (k(app)) of BPA were > 95.2 % and 0.145 min(-1) (R-2 = 0.9935). In addition, the impacts of operational parameters and co-existing constituents on BPA degradation are systematically evaluated. Importantly, the effective degradation of BPA (> 96.1 % at least) achieved at the test pH conditions (5-11) after 30 min reaction and achieved the highest BPA removal rate at pH = 11 (0.243 min? 1, R-2 = 0.9952). The electron paramagnetic resonance and radical scavenger experiments confirmed that both hydroxyl radical (center dot OH) and sulfate radical (SO4 center dot-) are the predominant reactive radicals in VUV/UV/PMS process. The second-order reaction rate constants of BPA with center dot OH and SO4 center dot- under different pH conditions were determined to be 0.74-1.86 x 10(10) M-1 s(-1) and 2.92-5.01 x 10(9) M-1 s(-1) via the competition kinetics. Meanwhile, the relative contribution rate of center dot OH decreased from 97.2 %-33.1 % with the increasement of pH from 5.0 to 11.0, while the relative contribution rate of SO4 center dot- rose from 1.7 % to 48.9 %. The present study demonstrated that the VUV/UV/PMS process, as a new advanced oxidation process, has potential applications for micropollutants removal in water.