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Effect of effluent organic matter on the adsorption of perfluorinated compounds onto activated carbon

机译：废水有机物对全氟化合物在活性炭上的吸附作用

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摘要

Effect of effluent organic matter (EfOM) on the adsorption of perfluorooctane sulfonate (PFOS) and perfluorooctanoate (PFOA) onto powdered activated carbon (PAC) was quantitatively investigated at environmentally relevant concentration levels. The adsorption of both perfluorinated compounds (PFCs) onto PAC followed pseudo-second order kinetics and fitted the Freundlich model well under the given conditions. Intraparticle diffusion was found to be the rate-controlling step in the PFC adsorption process onto PAC in the absence and presence of EfOM. The presence of EfOM, either in PFC-EfOM simultaneous adsorption onto fresh PAC or in PFC adsorption onto EfOM-preloaded PAC, significantly reduced the adsorption capacities and sorption rates of PFCs. The pH of zero point of charge was found to be 7.5 for fresh PAC and 4.2 for EfOM-preloaded PAC, suggesting that the adsorbed EfOM imparted a negative charge on PAC surface. The effect of molecular weight distribution of EfOM on the adsorption of PFCs was investigated with two EfOM fractions obtained by ultrafiltration. The low-molecular-weight compounds (＜1 kDa) were found to be the major contributors to the significant reduction in PFC adsorption capacity, while large-molecular-weight compounds (＞30 kDa) had much less effect on PFC adsorption capacity.
机译：在与环境有关的浓度水平下，定量研究了流出物有机物（EfOM）对全氟辛烷磺酸盐（PFOS）和全氟辛酸盐（PFOA）吸附在粉状活性炭（PAC）上的影响。两种全氟化合物（PFC）在PAC上的吸附均遵循拟二级动力学，并在给定条件下很好地拟合了Freundlich模型。发现在不存在和存在EfOM的情况下，颗粒内扩散是PFC吸附到PAC上的过程中的速率控制步骤。 EfOM的存在，无论是在PFC-EfOM中同时吸附在新鲜PAC上，还是在PFC中吸附在预载EfOM的PAC上，都大大降低了PFC的吸附能力和吸附速率。发现零电荷的pH值对于新鲜PAC为7.5，对于预装EfOM的PAC为4.2，这表明吸附的EfOM在PAC表面赋予了负电荷。用两个超滤得到的EfOM馏分研究了EfOM的分子量分布对PFC吸附的影响。发现低分子量化合物（＜1 kDa）是PFC吸附能力显着降低的主要因素，而大分子量化合物（＞ 30 kDa）对PFC吸附能力的影响要小得多。

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  • 来源
    《Journal of Hazardous Materials》 |2012年第30期|p.99-106|共8页
  • 作者

    Jing Yu; Lu Lv; Pei Lan; Shujuan Zhang; Bingcai Pan; Weiming Zhang;

  • 作者单位

    State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210046, PR China,College of Environmental Science & Engineering, Yangzhou University, 196 West Huayang Road, Yangzhou 225127, PR China;

    State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210046, PR China;

    State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210046, PR China,College of Environmental Science & Engineering, Yangzhou University, 196 West Huayang Road, Yangzhou 225127, PR China;

    State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210046, PR China;

    State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210046, PR China;

    State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210046, PR 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

    perfluorinated compounds; effluent organic matter; powdered activated carbon; adsorption;

    机译：全氟化合物;废水有机物;粉末状活性炭;吸附;

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