Environmental Engineering and Science, Department of Chemical and Environmental Engineering , University of Cincinnati , Cincinnati , Ohio 45221 , United States.
Department of Chemistry and Biochemistry , University of South Carolina , Columbia , South Carolina 29208 , United States.
Environ Sci Technol. 2018 Nov 6;52(21):12697-12707. doi: 10.1021/acs.est.8b04383. Epub 2018 Oct 19.
This study investigated the significant influence of HCO on the degradation of contaminants of emerging concern (CECs) during nitrate photolysis at 254 nm for water reuse applications. The second-order rate constants for the reactions between selected contaminants with carbonate radical (CO) were determined at pH 8.8 and T = 20 °C: estrone ((5.3 ± 1.1) × 10 M s), bisphenol A ((2.8 ± 0.2) × 10 M s), 17α-ethynylestradiol ((1.6 ± 0.3) × 10 M s), triclosan ((4.2 ± 1.4) × 10 M s), diclofenac ((2.7 ± 0.7) × 10 M s), atrazine ((5.7 ± 0.1) × 10 M s), carbamazepine ((4.2 ± 0.01) × 10 M s), and ibuprofen ((1.2 ± 1.1) × 10 M s). Contributions from UV, reactive nitrogen species (RNS), hydroxyl radical (OH), and CO to the CEC decomposition in UV/NO in the presence and absence of HCO were investigated. In addition, possible transformation products and degradation pathways of triclosan, diclofenac, bisphenol A, and estrone in UV/NO/HCO were proposed based on the mass (MS) and MS spectra. Significant reduction in the cytotoxicity of bisphenol A was observed after the treatment with UV/NO/HCO.
本研究探讨了 HCO 在 254nm 下硝酸盐光解过程中对新兴污染物（CECs）降解的重要影响，以应用于水再利用。在 pH 8.8 和 T = 20°C 下，确定了选定污染物与碳酸根自由基（CO）之间反应的二级速率常数：雌酮（(5.3 ± 1.1) × 10 M s），双酚 A（(2.8 ± 0.2) × 10 M s），17α-乙炔基雌二醇（(1.6 ± 0.3) × 10 M s），三氯生（(4.2 ± 1.4) × 10 M s），二氯芬酸（(2.7 ± 0.7) × 10 M s），莠去津（(5.7 ± 0.1) × 10 M s），卡马西平（(4.2 ± 0.01) × 10 M s）和布洛芬（(1.2 ± 1.1) × 10 M s）。研究了在有和没有 HCO 的情况下，UV、活性氮物种（RNS）、羟基自由基（OH）和 CO 对 UV/NO 中 CEC 分解的贡献。此外，根据质量（MS）和 MS 谱，提出了三氯生、二氯芬酸、双酚 A 和雌酮在 UV/NO/HCO 中的可能转化产物和降解途径。在经过 UV/NO/HCO 处理后，双酚 A 的细胞毒性显著降低。
