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首页> 外文期刊>Journal of Hazardous Materials >Construction of Bi_2O_3/CuNiFe LDHs composite and its enhanced photocatalytic degradation of lomefloxacin with persulfate under simulated sunlight
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Construction of Bi_2O_3/CuNiFe LDHs composite and its enhanced photocatalytic degradation of lomefloxacin with persulfate under simulated sunlight

机译：Bi_2O_3 / CuNiFe LDHs复合材料的构建及其在模拟阳光下过硫酸盐增强洛美沙星的光催化降解

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摘要

Advanced oxidation methods based on photocatalysis and sulfate radicals have attached most interest towards contaminant degradation. However, there are a lack of coupling two methods in the field of pollutant degradation. In the present study, a new Bi2O3/CuNiFe LDHs composite was fabricated and it could efficiently activate persulfate (PS) for lomefloxacin (LOM) decomposition under simulated sunlight, in which 84.6% of LOM (10 mg center dot L-1) was degraded over 40 min with 0.4 g center dot L-1 of Bi2O3/CuNiFe LDHs composite and 0.74 mM of PS at natural pH. In addition, the Bi2O3/CuNiFe LDHs composite possessed good reusability and stability at least four runs. Moreover, active radical scavenging experiments indicated that hydroxyl radicals (HO center dot), sulfate radicals (SO4 center dot(-)), superoxide radicals (O-2 center dot(-)) and hole (h(+)) were the main radicals under LOM degradation process. Subsequently, the possible degradation intermediates were determined and the decomposition pathways were put forward. At the same time, activated sludge inhibition experiments were performed to assess the variation of toxicity of LOM and its degradation intermediates during oxidation. Finally, possible reaction mechanism of Bi2O3/CuNiFe LDHs composite for PS activation under simulated sunlight was proposed.
机译：基于光催化和硫酸根的先进氧化方法已引起人们对污染物降解的极大关注。但是，在污染物降解领域缺乏两种方法的结合。在本研究中，制备了一种新型的Bi2O3 / CuNiFe LDHs复合材料，它可以在模拟阳光下有效活化过硫酸盐（PS）来降解洛美沙星（LOM），其中84.6％的LOM（10 mg中心点L-1）被降解。用0.4 g Bi2O3 / CuNiFe LDHs复合材料的中心点L-1和0.74 mM的PS在自然pH下历时40分钟。此外，Bi2O3 / CuNiFe LDHs复合材料至少在四次试验中都具有良好的可重复使用性和稳定性。此外，活性自由基清除实验表明，羟基自由基（HO中心点），硫酸盐自由基（SO4中心点（-）），超氧化物自由基（O-2中心点（-））和空穴（h（+））是主要的LOM降解过程中的自由基。随后，确定了可能的降解中间体，并提出了降解途径。同时，进行了活性污泥抑制实验，以评估氧化过程中LOM及其降解中间体的毒性变化。最后，提出了Bi2O3 / CuNiFe LDHs复合材料在模拟阳光下活化PS的可能反应机理。

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  • 来源
    《Journal of Hazardous Materials》 |2020年第5期|121236.1-121236.12|共12页
  • 作者

    Zhang Huixuan; Nengzi Li-chao; Wang Zhongjuan; Zhang Xinyi; Li Bo; Cheng Xiuwen;

  • 作者单位

    Lanzhou Univ Coll Earth & Environm Sci Key Lab Environm Pollut Predict & Control Key Lab Western Chinas Environm Syst Minist Educ Lanzhou 730000 Gansu Peoples R China;

    Xichang Univ Acad Econ & Environm Sci Liangshan Sichuan Peoples R China;

    Lanzhou Univ Coll Earth & Environm Sci Key Lab Environm Pollut Predict & Control Key Lab Western Chinas Environm Syst Minist Educ Lanzhou 730000 Gansu Peoples R China|Xichang Univ Acad Econ & Environm Sci Liangshan Sichuan Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);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; Bi2O3/CuNiFe LDHs composite; Lomefloxacin; Reaction mechanism; Simulated sunlight;

    机译：过硫酸盐;Bi2O3 / CuNiFe LDHs复合材料;洛美沙星;反应机理;模拟阳光;

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