Degradation of Aqueous Polycyclic Musk Tonalide by Ultraviolet-Activated Free Chlorine
2019
Lili Wang | Xiaowei Liu
Chlorine-incorporating ultraviolet (UV) provides a multiple barrier for drinking water disinfection. Meanwhile, post-UV employment can promote the degradation of micropollutants by radical production from chlorine residual photolysis. This work studied the degradation of one such chemical, tonalide (AHTN), by low-pressure UV-activated free chlorine (FC) under typical UV disinfection dosage of <:200 mJ·:cm&minus:2 and water matrix of filtered tank effluent. AHTN was rapidly degraded by UV/FC in accordance with pseudo-first-order kinetics. The reaction rate constants of AHTN with reactive chlorine species and hydroxyl radical (HO&bull:) were estimated. Mechanistic exploration evidenced that under UV/FC, AHTN degradation was attributable to direct photolysis, ClO&bull:, and HO&bull:. The carbonyl side chain of AHTN served as an important attack site for radicals. Water matrices, such as natural organic matter (NOM), HCO 3 &minus: , Cu 2 + , PO 4 3 &minus: , and Fe 2 + , showed noticeable influence on the UV/FC process with an order of NOM >: HCO 3 &minus: >: Cu 2 + >: PO 4 3 &minus: >: Fe 2 + . Reaction product analysis showed ignorable formation of chlorinated intermediates and disinfection byproducts.
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