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首页> 外文期刊>Chemosphere >Organic contaminated sediments remediation with active caps: Nonlinear adsorption unveiled by combined isotherm and column transportation studies
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Organic contaminated sediments remediation with active caps: Nonlinear adsorption unveiled by combined isotherm and column transportation studies

机译：活性帽修复有机污染的沉积物：等温线和色谱柱运移研究相结合揭示了非线性吸附

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摘要

Bench-scale column studies were performed with four cap materials (sand, apatite, organoclay and granular activated carbon) for five target compounds (toluene, naphthalene, phenanthrene, pyrene and dichlorobiphenyl) to represent a range of cap materials and pollutants (volatile & semi-volatile compounds) commonly found in sediments. Two moment-derived methods were used to model cap performance. Rough agreement was observed between the column experiments and modeling data with the fronting and tailing effects identified from certain breakthrough curves indicating a high potential of non-linear adsorption. Distribution coefficients (k(d)) were experimentally determined with isotherm studies together with measurements of surface area and microporosity of the cap materials via nitrogen adsorption porisimetry. These studies unveiled the occurrence of nonlinear adsorption by Freundlich simulation. The effects of nonlinear adsorption of the cap were further explored via modeling. Results suggested better prediction of cap performance assuming nonlinear adsorption instead of linear adsorption results based upon the risk of release for a 30-year period. (C) 2018 Elsevier Ltd. All rights reserved.
机译：对四种目标化合物（甲苯，萘，菲、,和二氯代联苯）使用四种帽盖材料（砂，磷灰石，有机粘土和粒状活性炭）进行了台式色谱柱研究，以代表一系列帽盖材料和污染物（挥发性和半挥发性） -挥发性化合物）通常在沉积物中发现。两种矩导出的方法用于建模封顶性能。在柱实验和建模数据之间观察到粗略的一致性，从某些穿透曲线确定的前后效应表明非线性吸附的潜力很大。分布系数（k（d））是通过等温线研究以及通过氮吸附孔隙率法测量瓶盖材料的表面积和微孔率来实验确定的。这些研究通过Freundlich模拟揭示了非线性吸附的发生。通过建模进一步探索了帽的非线性吸附的影响。结果表明，根据30年释放的风险，假设使用非线性吸附而不是线性吸附，可以更好地预测瓶盖性能。 （C）2018 Elsevier Ltd.保留所有权利。

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  • 来源
    《Chemosphere》 |2019年第1期|710-718|共9页
  • 作者

    Yin Ke; Viana Priscilla Z.; Rockne Karl J.;

  • 作者单位

    Univ Illinois, Dept Civil & Mat Engn, Engn Res Facility 3077, 842 West Taylor St,M-C 246, Chicago, IL 60607 USA;

    Nanyang Technol Univ, Nanyang Environm & Water Res Inst, Residues & Resource Reclamat Ctr, 1 Cleantech Loop,CleanTech One, Singapore 637141, Singapore;

    Arcadis, 320 Commerce Suite 200, Irvine, CA 92602 USA;

    Natl Sci Fdn, Div Chem Bioengn Environm & Transport Syst, 2415 Eisenhower Ave, Alexandria, VA 22314 USA;

  • 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

    Sediments; Organic contaminants; Column study; Isotherm; Active cap;

    机译：沉积物;有机污染物;柱研究;等温线;有效盖;

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