Degradation of 2,4,6-trichloroanisole by UV/H2O2: kinetics and products
LUO Cong-wei1, MA Jun1, JIANG Jin1, GUAN Chao-ting1, PANG Su-yan2, LIU Hong-jun1, ZHAI Xue-dong3, WU Dao-ji4
1. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China;
2. Key Laboratory of Green Chemical Engineering and Technology of College of Heilongjiang Province, College of Chemical and Environmental Engineering, Harbin University of Science and Technology, Harbin 150040, China;
3. School of science and industrial technology, Harbin Institute of Technology, Harbin 150090, China;
4. School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan 250010, China
The degradation of 2,4,6-trichloroanisole (TCA) in UV/H2O2 process was investigated in the present study. Effects of water matrix (i.e., natural organic matter (NOM), carbonate/bicarbonate (HCO3-/CO32-), chloride ions (Cl-)), TCA concentration, and H2O2 dosage were evaluated. The second order rate constant of TCA react with HO· was determined to be 5.1×109L/(mol×s). The degradation efficiency of TCA was increased with increasing H2O2 dosage. The increase of TCA initial concentration (0.5~200nmol/L) and Cl- concentration (0.5~10mmol/L) had slight negative effects on TCA degradation. The removal of TCA was significantly inhibited in the presence of NOM or HCO3-/CO32-. Further, the main degradation products, including 2,4,6-trichlorophenol, 2,6-dichloro-1,4-benzoquinone and two aromatic ring-opening products, were detected in the reaction of TCA with HO·, and thus a tentative pathway was proposed.
Antonopoulou M, Evgenidou E, Lambropoulou D, et al. A review on advanced oxidation processes for the removal of taste and odor compounds from aqueous media [J]. Water Research, 2014,53: 215-234.
Qi F, Xu B, Chen Z, et al. Influence of aluminum oxides surface properties on catalyzed ozonation of 2,4,6-trichloroanisole [J]. Separation and Purification Technology, 2009,66(2):405-410.
[5]
Karlsson S, Kaugare S, Grimvall A, et al. Formation of 2,4,6-trichlorophenol and 2,4,6-trichloroanisole during treatment and distribution of drinking water [J]. Water Science and Technology, 1995,31(11):99.
[6]
Qi F, Xu B, Chen Z, et al. Ozonation catalyzed by the raw bauxite for the degradation of 2,4,6-trichloroanisole in drinking water [J]. Journal of Hazardous Materials, 2009,168(1):246-252.
[7]
Lee Y, Gerrity D, Lee M, et al. Organic Contaminant Abatement in Reclaimed Water by UV/H2O2 and a Combined Process Consisting of O3/H2O2 Followed by UV/H2O2: Prediction of Abatement Efficiency, Energy Consumption, and Byproduct Formation [J]. Environmental Science & Technology, 2016,50(7): 3809-3819.
[8]
Chu W, Gao N, Yin D, et al. Impact of UV/H2O2 Pre-Oxidation on the Formation of Haloacetamides and Other Nitrogenous Disinfection Byproducts during Chlorination [J]. Environmental Science & Technology, 2014,48(20):12190-12198.
Xiao Y, Zhang L, Yue J, et al. Kinetic modeling and energy efficiency of UV/H2O2 treatment of iodinated trihalomethanes [J]. Water Research, 2015,75:259-269.
[13]
Pereira V J, Weinberg H S, Linden K G, et al. UV Degradation Kinetics and Modeling of Pharmaceutical Compounds in Laboratory Grade and Surface Water via Direct and Indirect Photolysis at 254nm [J]. Environmental Science & Technology, 2007,41(5):1682-1688.
[14]
Rosenfeldt E J, Melcher B, Linden K G. UV and UV/H2O2 treatment of methylisoborneol (MIB) and geosmin in water [J]. Journal of Water Supply: Research and Technology-Aqua, 2005, 54(7):423.
[15]
Jo C H, Dietrich A M, Tanko J M. Simultaneous degradation of disinfection byproducts and earthy-musty odorants by the UV/H2O2 advanced oxidation process [J]. Water Research, 2011, 45(8):2507-2516.
Luo C W, Jiang J, Ma J, et al. Oxidation of the odorous compound 2,4,6-trichloroanisole by UV activated persulfate: Kinetics, products, and pathways [J]. Water Research, 2016,96:12-21.
[19]
Jiang J, Gao Y, Pang S Y, et al. Oxidation of Bromophenols and Formation of Brominated Polymeric Products of Concern during Water Treatment with Potassium Permanganate [J]. Environmental Science & Technology, 2014,48(18):10850-10858.
[20]
Zhang X, Minear R A, Barrett S E. Characterization of High Molecular Weight Disinfection Byproducts from Chlorination of Humic Substances with/without Coagulation Pretreatment Using UF-SEC-ESI-MS/MS [J]. Environmental Science & Technology, 2005,39(4):963-972.
[21]
Bader H, Sturzenegger V, Hoigné J. Photometric method for the determination of low concentrations of hydrogen peroxide by the peroxidase catalyzed oxidation of N, N-diethyl-p-phenylenediamine (DPD) [J]. Water Research, 1988,22(9):1109-1115.
Peter A, Von Gunten U. Oxidation Kinetics of Selected Taste and Odor Compounds During Ozonation of Drinking Water [J]. Environmental Science & Technology, 2007,41(2):626-631.
[24]
Luo C W, Ma J, Jiang J, et al. Simulation and comparative study on the oxidation kinetics of atrazine by UV/H2O2, UV/HSO5- and UV/S2O82- [J]. Water Research, 2015,80:99-108.
Kim I, Yamashita N, Tanaka H. Photodegradation of pharmaceuticals and personal care products during UV and UV/H2O2 treatments [J]. Chemosphere, 2009,77(4):518-525.
[27]
Lutze H V, Bircher S, Rapp I, et al. Degradation of Chlorotriazine Pesticides by Sulfate Radicals and the Influence of Organic Matter [J]. Environmental Science & Technology, 2015,49(3): 1673-1680.
[28]
Sun P, Lee W, Zhang R, et al. Degradation of DEET and Caffeine under UV/Chlorine and Simulated Sunlight/Chlorine Conditions [J]. Environmental Science & Technology, 2016,50(24):13265-13273.
[29]
Benitez F J, Beltran-Heredia J, Acero J L, et al. Chemical Decomposition of 2,4,6-Trichlorophenol by Ozone, Fenton's Reagent, and UV Radiation [J]. Industrial & Engineering Chemistry Research, 1999,38(4):1341-1349.
