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首页> 外文期刊>Journal of Hazardous Materials >Decomposition of acetaminophen in water by a gas phase dielectric barrier discharge plasma combined with TiO2-rGO nanocomposite: Mechanism and degradation pathway
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Decomposition of acetaminophen in water by a gas phase dielectric barrier discharge plasma combined with TiO2-rGO nanocomposite: Mechanism and degradation pathway

机译：气相介电势垒放电等离子体结合TiO2-rGO纳米复合材料对水中对乙酰氨基酚的分解：机理和降解途径

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摘要

Acetaminophen (APAP) served as the model pollutant to evaluate the feasibility of pollutant removal by gas phase dielectric barrier discharge plasma combined with the titanium dioxide-reduced Graphene Oxide (TiO2-rGO) nanocomposite. TiO2-rGO nanocomposite was prepared using the modified hydrothermal method and characterized by TEM and XPS before and after plasma process. The results indicated that the APAP degradation efficiency was significantly improved to 92% after 18 min of discharge plasma treatment coupling 0.25 gL(-1) TiO2-rGO 5% wt at 18 kV, compared with the plasma alone and plasma combined with P25 TiO2. The degradation mechanism for APAP in this system was studied by investigating the effects of the operational variables (e.g. discharge voltage and pH value) and the amount of the generated active species; and the results showed that O-3 and H2O2 yields were influenced notably by adding TiO2-rGO. Also, it was observed that, compared with unused TiO2-rGO, the photocatalytic performance of used TiO2-rGO declined after several recirculation times due to the further reduction of Graphene Oxide in plasma system. Finally, intermediate products were analyzed by UV-vis spectrometry and HPLC/MS, and possible transformation pathways were identified with the support of theoretically calculating the frontier electron density of APAP. (C) 2016 Elsevier B.V. All rights reserved.
机译：对乙酰氨基酚（APAP）用作模型污染物，以评估气相介电势垒放电等离子体与二氧化钛还原的氧化石墨烯（TiO2-rGO）纳米复合材料相结合去除污染物的可行性。采用改进的水热法制备了TiO2-rGO纳米复合材料，并在等离子处理前后通过TEM和XPS对其进行了表征。结果表明，与单独的等离子体以及与P25 TiO2结合的等离子体相比，放电等离子体处理在0.25 gL（-1）TiO2-rGO 5％wt在18 kV耦合18分钟后，APAP的降解效率显着提高至92％。通过研究操作变量（例如放电电压和pH值）和产生的活性物质的数量的影响，研究了该系统中APAP的降解机理。结果表明，加入TiO2-rGO对O-3和H2O2的产率有显着影响。另外，还观察到，由于等离子体系统中氧化石墨烯的进一步减少，与多次使用的TiO 2 -rGO相比，使用过的TiO 2 -rGO的光催化性能在若干次再循环时间后下降。最后，通过紫外可见光谱和HPLC / MS对中间产物进行了分析，并在理论上计算APAP前沿电子密度的基础上确定了可能的转化途径。 （C）2016 Elsevier B.V.保留所有权利。

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  • 来源
    《Journal of Hazardous Materials》 |2017年第ptab期|719-729|共11页
  • 作者

    Zhang Guyu; Sun Yabing; Zhang Chunxiao; Yu Zhongqing;

  • 作者单位

    Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resources Reuse, Nanjing 210046, Jiangsu, Peoples R China;

    Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resources Reuse, Nanjing 210046, Jiangsu, Peoples R China;

    Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resources Reuse, Nanjing 210046, Jiangsu, Peoples R China;

    Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resources Reuse, Nanjing 210046, Jiangsu, 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

    Gas phase dielectric barrier discharge plasma; TiO2; Reduced graphene oxide; Acetaminophen; Degradation pathway;

    机译：气相电介质阻挡放电等离子体TiO2还原氧化石墨烯对乙酰氨基酚降解途径;

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