Oxidation of MCPA and 2,4-D by UV radiation, ozone, and the combinations UV/H2O2 and O3/H2O2

被引:48
作者
Benitez, FJ [1 ]
Acero, JL [1 ]
Real, FJ [1 ]
Roman, S [1 ]
机构
[1] Univ Extremadura, Dept Ingn Quim & Energet, E-06071 Badajoz, Spain
关键词
phenoxyalkyl acid derivative herbicides; MCPA; 2,4-D; UV radiation; ozone; hydroxyl radicals; quantum yields; rate constants;
D O I
10.1081/PFC-120035925
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The phenoxyalkyl acid derivative herbicides MCPA (4-chloro 2-methylphenoxyacetic acid) and 2,4-D (2,4-dichlorophenoxyacetic acid) were oxidized in ultrapure water by means of a monochromatic UV irradiation and by ozone, as well as by the combinations UV/H2O2 and O-3/H2O2. In the direct photolysis of MCPA, the quantum yield at 20degreesC was directly evaluated and a value of 0.150 mol Eins(-1) was obtained in the pH range 5-9, while a lower value of 0.41 x 10(-2) mol Eins(-1) was determined at pH = 3. Similarly, for 2,4-D a value of 0.81 x 10(-2) mol Eins(-1) was deduced, independent of the pH of work. The influence of the additional presence of hydrogen peroxide was established in the combined process UV/H2O2, and the specific contribution of the radical pathway to the global photo-degradation was evaluated. The oxidation by ozone and by the combination O-3/H2O2 was also studied, with the determination of the rate constants for the reactions of both herbicides with ozone and hydroxyl radicals at 20degreesC. These rate constants for the direct reactions with ozone were 47.7 and 21.9 M-1 s(-1) for MCPA and 2,4-D respectively, while the found values for the rate constants Corresponding to the radical reactions were 6.6 x 10(9) and 5.1 x 10(9) M-1 s(-1).
引用
收藏
页码:393 / 409
页数:17
相关论文
共 50 条
  • [31] Application of O3/UV/ H2O2 oxidation and process optimization for treatment of potato chips manufacturing wastewater
    Arslan, Ayla
    Topkaya, Eylem
    Ozbay, Bilge
    Ozbay, Ismail
    Veli, Sevil
    WATER AND ENVIRONMENT JOURNAL, 2017, 31 (01) : 64 - 71
  • [32] Evaluation of O3/UV and O3/H2O2 as Practical Advanced Oxidation Processes for Degradation of 1,4-Dioxane
    Takahashi, Nobuyuki
    Hibino, Toshiyuki
    Torii, Hisatomo
    Shibata, Shingo
    Tasaka, Shinya
    Yoneya, Jun
    Matsuda, Manabu
    Ogasawara, Hisao
    Sugimoto, Kazuaki
    Fujioka, Tetsuo
    OZONE-SCIENCE & ENGINEERING, 2013, 35 (05) : 331 - 337
  • [33] Classification of the degradability of 30 pharmaceuticals in water with ozone, UV and H2O2
    Kim, I. H.
    Tanaka, H.
    Iwasaki, T.
    Takubo, T.
    Morioka, T.
    Kato, Y.
    WATER SCIENCE AND TECHNOLOGY, 2008, 57 (02) : 195 - 200
  • [34] Evaluation of electrochemical and O3/UV/H2O2 methods at various combinations during treatment of mature landfill leachate
    Polatidou, Electra
    Azis, Konstantinos
    Polatides, Christos
    Remmas, Nikolaos
    Ntougias, Spyridon
    Melidis, Paraschos
    JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING, 2022, 57 (04): : 298 - 305
  • [35] Comparison of sludge treatment by O3 and O3/H2O2
    Zhao Yuxin
    Wang Liang
    Yu Helong
    Jiang Baojun
    Jiang Jinming
    WATER SCIENCE AND TECHNOLOGY, 2014, 70 (01) : 114 - 119
  • [36] Photocatalyzed destruction of organic dyes using microwave/UV/O3/H2O2/TiO2 oxidation system
    Kim, Sun-Jae
    Kim, Sang-Chai
    Seo, Seong-Gyu
    Lee, Do-Jin
    Lee, Heon
    Park, Sung Hoon
    Jung, Sang-Chul
    CATALYSIS TODAY, 2011, 164 (01) : 384 - 390
  • [37] Ozonation and combined ozone/H2O2, UV/ozone and UV/H2O2 for treatment of fuel oxygenates MTBE, ETBE, TAME, and DIPE from water -: a comparison of removal efficiencies
    Baus, C.
    Sona, M.
    Brauch, H.-J.
    WATER SCIENCE AND TECHNOLOGY, 2007, 55 (12) : 307 - 311
  • [38] Benzophenone-3 degradation via UV/H2O2 and UV/persulfate reactions
    Lee, Young-Min
    Lee, Gowoon
    Zoh, Kyung-Duk
    JOURNAL OF HAZARDOUS MATERIALS, 2021, 403
  • [39] Experimental study of the removal NOx and SO2 from flue gas using the O3/H2O2, and O3/UV processes
    Dalal, Parveen
    Dalai, Sridhar
    Khuntia, Snigdha
    ENVIRONMENTAL TECHNOLOGY, 2024, 45 (22) : 4526 - 4535
  • [40] Inactivation of Giardia intestinalis by H2O2/O3
    Li Shao-feng
    Ran Zhi-lin
    ENVIRONMENTAL TECHNOLOGY AND RESOURCE UTILIZATION II, 2014, 675-677 : 134 - +