期刊
CHEMOSPHERE
卷 230, 期 -, 页码 258-267出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2019.05.052
关键词
Advanced oxidation process; Trichloroanisoles; Kinetics; Degradation mechanism; Water matrix effects; Toxicity assessment
资金
- National Major Projects on Water Pollution Control and Management Technology [2017ZX07501003, 2017ZX07502003-06]
- Shandong Province National Science Foundation, China [ZR2017MC047]
- Special Project of Taishan Scholar Construction Engineering [ts201712084]
The elimination of 2,3,6-trichloroanisole (2,3,6-TCA), which produces a musty-earthy off-odor in water, by an ultraviolet (UV)/H2O2 process was assessed. The removal of 88.1% of 2,3,6-TCA in ultrapure water (UPW) was achieved using an initial 2,3,6-TCA concentration of 1 mu g L-1 (4.73 nM), a H2O2 concentration of 20 mg L-1 (0.588 mM), a UV intensity of 1.44 mW cm(-2) and a pH of 8.2. The reaction was found to be pseudo first order with a rate constant (k(obs)) of 0.0340 min(-1). Both the removal efficiency and k(obs) increased significantly upon increasing the H2O2 concentration from 10 to 50 mg L-1. The second order rate constant (k(HO)(center dot),2,3,6-TCA) in competition kinetic trials was determined to be 8.17 x 10(7)M(-1)s(-1). Degradation products generated during both the UV photolysis and UV/H2O2 treatment of 2,3,6-TCA solutions were analyzed using ultrahigh resolution gas chromatography/mass spectrometry, and the degradation mechanism was proposed. The toxicities of water solutions during both processes were assessed via a luminescence method in conjunction with Vibrio fischeri. The pH and Cl-, HCO3- and natural organic matter concentrations of the aqueous medium were all found to significantly affect the removal of 2,3,6-TCA. The degradation rates of trichloroanisoles (TCAs) in real-world water samples demonstrated that UV/H2O2 has significant potential with regard to controlling TCAs as pollutants in water. (C) 2019 Elsevier Ltd. All rights reserved.
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