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Simulation and comparative study on the oxidation kinetics of atrazine by UV/H₂O₂, UV/HSO₅⁻ and UV/S₂O₈²⁻.
Water Res. 2015 Sep 01; 80:99-108.WR

Abstract

This study comparatively investigated atrazine (ATZ) degradation by irradiation at the wavelength of 254 nm in the presence of peroxides including hydrogen peroxide (H2O2), peroxymonosulfate (HSO5(-)), and persulfate (S2O8(2-)) at various initial ATZ concentrations and oxidant dosages. The effects of water matrix, such as carbonate/bicarbonate (HCO3(-)/CO3(2-)), chloride ions (Cl(-)), and natural organic matter (NOM), were evaluated on these three advanced oxidation processes. A simple steady-state kinetic model was developed based on the initial rates of ATZ destruction, which could well describe the apparent pseudo-first-order rate constants (k(app), s(-1)) of ATZ degradation in these three processes. The specific roles of reactive species (i.e., HO·, SO4(-·), CO3(-·), and Cl2(-·)) under various experimental conditions were quantitatively evaluated based on their steady-state concentrations obtained from this model. Modeling results showed that the steady-state concentrations of HO· and SO4(-·) decreased with the increase of CO3(2-)/HCO3(-) concentration, and the relative contribution of HO· to ATZ degradation significantly decreased in UV/H2O2 and UV/HSO5(-) systems. On the other hand, the scavenging effect of HCO3(-)/CO3(2-) on the relative contribution of SO4(-·) to ATZ degradation was lower than that on HO·. The presence of Cl(-) (0.5-10 mM) significantly scavenged SO4(-·) but had slightly scavenging effect on HO· at the present experimental pH, resulting in greater decrease of k(app) in the UV/S2O8(2-) than UV/H2O2 and UV/HSO5(-) systems. Higher levels of Cl2(-·) were generated in the UV/S2O8(2-) than those in the UV/H2O2 and UV/HSO5(-) systems at the same Cl(-) concentrations. NOM significantly decreased k(app) due to its effects of competitive UV absorption and radical scavenging with the latter one being dominant. These results improve the understanding of the effects of water constituents for ATZ degradation in the UV-based oxidation processes.

Authors+Show Affiliations

State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China.State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China. Electronic address: majun@hit.edu.cn.State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China. Electronic address: jiangjinhit@126.com.State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China.State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China.State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China.School of Water Conservancy & Civil Engineering, Northeast Agricultural University, Harbin, 150030, China.School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan, 250010, China.

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

25996757

Citation

Luo, Congwei, et al. "Simulation and Comparative Study On the Oxidation Kinetics of Atrazine By UV/H₂O₂, UV/HSO₅⁻ and UV/S₂O₈²⁻." Water Research, vol. 80, 2015, pp. 99-108.
Luo C, Ma J, Jiang J, et al. Simulation and comparative study on the oxidation kinetics of atrazine by UV/H₂O₂, UV/HSO₅⁻ and UV/S₂O₈²⁻. Water Res. 2015;80:99-108.
Luo, C., Ma, J., Jiang, J., Liu, Y., Song, Y., Yang, Y., Guan, Y., & Wu, D. (2015). Simulation and comparative study on the oxidation kinetics of atrazine by UV/H₂O₂, UV/HSO₅⁻ and UV/S₂O₈²⁻. Water Research, 80, 99-108. https://doi.org/10.1016/j.watres.2015.05.019
Luo C, et al. Simulation and Comparative Study On the Oxidation Kinetics of Atrazine By UV/H₂O₂, UV/HSO₅⁻ and UV/S₂O₈²⁻. Water Res. 2015 Sep 1;80:99-108. PubMed PMID: 25996757.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Simulation and comparative study on the oxidation kinetics of atrazine by UV/H₂O₂, UV/HSO₅⁻ and UV/S₂O₈²⁻. AU - Luo,Congwei, AU - Ma,Jun, AU - Jiang,Jin, AU - Liu,Yongze, AU - Song,Yang, AU - Yang,Yi, AU - Guan,Yinghong, AU - Wu,Daoji, Y1 - 2015/05/12/ PY - 2014/12/15/received PY - 2015/05/05/revised PY - 2015/05/08/accepted PY - 2015/5/22/entrez PY - 2015/5/23/pubmed PY - 2016/4/2/medline KW - Atrazine KW - Hydroxyl radical KW - Steady-state kinetic model KW - Sulfate radical KW - UV-based oxidation SP - 99 EP - 108 JF - Water research JO - Water Res VL - 80 N2 - This study comparatively investigated atrazine (ATZ) degradation by irradiation at the wavelength of 254 nm in the presence of peroxides including hydrogen peroxide (H2O2), peroxymonosulfate (HSO5(-)), and persulfate (S2O8(2-)) at various initial ATZ concentrations and oxidant dosages. The effects of water matrix, such as carbonate/bicarbonate (HCO3(-)/CO3(2-)), chloride ions (Cl(-)), and natural organic matter (NOM), were evaluated on these three advanced oxidation processes. A simple steady-state kinetic model was developed based on the initial rates of ATZ destruction, which could well describe the apparent pseudo-first-order rate constants (k(app), s(-1)) of ATZ degradation in these three processes. The specific roles of reactive species (i.e., HO·, SO4(-·), CO3(-·), and Cl2(-·)) under various experimental conditions were quantitatively evaluated based on their steady-state concentrations obtained from this model. Modeling results showed that the steady-state concentrations of HO· and SO4(-·) decreased with the increase of CO3(2-)/HCO3(-) concentration, and the relative contribution of HO· to ATZ degradation significantly decreased in UV/H2O2 and UV/HSO5(-) systems. On the other hand, the scavenging effect of HCO3(-)/CO3(2-) on the relative contribution of SO4(-·) to ATZ degradation was lower than that on HO·. The presence of Cl(-) (0.5-10 mM) significantly scavenged SO4(-·) but had slightly scavenging effect on HO· at the present experimental pH, resulting in greater decrease of k(app) in the UV/S2O8(2-) than UV/H2O2 and UV/HSO5(-) systems. Higher levels of Cl2(-·) were generated in the UV/S2O8(2-) than those in the UV/H2O2 and UV/HSO5(-) systems at the same Cl(-) concentrations. NOM significantly decreased k(app) due to its effects of competitive UV absorption and radical scavenging with the latter one being dominant. These results improve the understanding of the effects of water constituents for ATZ degradation in the UV-based oxidation processes. SN - 1879-2448 UR - https://www.unboundmedicine.com/medline/citation/25996757/Simulation_and_comparative_study_on_the_oxidation_kinetics_of_atrazine_by_UV/H₂O₂_UV/HSO₅⁻_and_UV/S₂O₈²⁻_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0043-1354(15)30004-X DB - PRIME DP - Unbound Medicine ER -