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首页> 外文期刊>Chemosphere >Degradation of atrazine by electrochemically activated persulfate using BDD anode: Role of radicals and influencing factors
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Degradation of atrazine by electrochemically activated persulfate using BDD anode: Role of radicals and influencing factors

机译：BDD阳极电化学活化过硫酸盐降解阿特拉津的作用：自由基的作用和影响因素

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摘要

AbstractA novel advanced oxidation process using boron-doped diamond (BDD) anode to activate persulfate (PS) with low concentration of electrolyte was systematically investigated in this study. Compared to direct electrochemical oxidation of atrazine (ATZ) using BDD anode, the addition and activation of PS significantly declined the demand for electrolytes. It was confirmed by scavenger experiments that both radical and non-radical oxidation occurred in this system. Degradation of ATZ was enhanced with the increase of current density and dosage of PS, and decrease of initial pH. However, the increase of current density can also lead to the decrease of current efficiency, then increase of energy consumption. Besides, the inhibitory effect of anions on the degradation of ATZ followed the order ofHCO3−H2PO4−NO3−, while the presence ofCl−accelerated the degradation of ATZ. Furthermore, the degradation products mainly resulting from de-alkylation, de-chlorination, and hydroxylation were detected. Due to the distinctive preference to ethyl group in BDD/PS system, the formation of deethyl-atrazine was quicker than that of deisopropyl-atrazine. The study aims to provide a comprehensive understanding on the potential application of BDD/PS system in water treatment.Graphical abstractDisplay OmittedHighlights•Demand for electrolyte decreased significantly in BDD/PS system.•Both radical and non-radical oxidation occurred in BDD/PS system.•Dealkylation and dechlorination are two main reactions in degradation of ATZ.
机译： 摘要 系统地研究了一种新的先进的氧化工艺，该工艺采用掺硼金刚石（BDD）阳极激活低浓度电解液的过硫酸盐（PS）。在这个研究中。与使用BDD阳极直接对at去津（ATZ）进行电化学氧化相比，PS的添加和活化大大降低了对电解质的需求。通过清除剂实验证实了该系统中同时发生了自由基和非自由基氧化。随着电流密度和PS剂量的增加，以及初始pH值的降低，ATZ的降解作用增强。但是，电流密度的增加也会导致电流效率的下降，进而导致能耗的增加。此外，阴离子对ATZ降解的抑制作用遵循 HCO 3 − H 2 PO 4 − < mml：mtext>否 3 − ，而 Cl − 加速了ATZ的降解。此外，检测到主要由脱烷基，脱氯和羟基化引起的降解产物。由于在BDD / PS系统中对乙基的独特偏好，脱乙基r去津的形成比脱异丙基-去津的形成要快。该研究旨在提供对BDD / PS系统在水处理中的潜在应用的全面理解。 图形摘要 显示省略 突出显示 • 对电解质的需求下降在BDD / PS系统中显着tem。 • 在BDD / PS系统中发生了自由基氧化和非自由基氧化。 • 脱烷基和脱氯是ATZ降解的两个主要反应。

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  • 来源
    《Chemosphere》 |2018年第3期|236-244|共9页
  • 作者

    Lingjun Bu; Shumin Zhu; Shiqing Zhou;

  • 作者单位

    Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, Department of Water Engineering and Science, College of Civil Engineering, Hunan University;

    State Key Laboratory of Pollution Control and Resources Reuse, Key Laboratory of Yangtze Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University,School of Civil and Environmental Engineering, Georgia Institute of Technology;

    Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, Department of Water Engineering and Science, College of Civil Engineering, Hunan University,School of Civil and Environmental Engineering, Georgia Institute of Technology;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Persulfate; Boron-doped diamond electrode; Deethyl-atrazine; Deisopropyl-atrazine;

    机译：过硫酸盐;掺硼金刚石电极;去乙基-去津;去异丙基-去津;

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