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Sorption of tetracycline on organo-montmorillonites

机译：四环素在有机蒙脱石上的吸附

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摘要

Tetracycline (TC) is a veterinary antibiotic that is frequently detected as pollutant in the environment. Powerful adsorbents are required for removing TC. The present paper compares the TC adsorption capacity of Na-montmorillonite (Na-mont) with six organo-montmorillonites (organo-monts). Three quaternary ammonium cations (QACs) with different alkyl-chain lengths were used as modifiers. Powder X-ray diffraction indicated that the d_(001) values of organo-monts increased with increasing the QACs loading and alkyl-chain length. The CECs of the organo-monts were substantially lower than that of Na-mont and decreased with QACs chain length and increased loading. The modeling of the adsorption kinetics revealed that the processes of TC adsorption on the tested samples could be well fitted by the pseudo-second-order equation. The maximum adsorption capacities of TC on the organo-monts (1000-2000 mmol/kg) were considerably higher than that on Na-mont (769mmol/kg). Both the Langmuir and Freundlich model could fit the adsorption isotherms. The TC adsorption to the organo-monts increase significantly with decreasing the pH below 5.5 because of the electrostatic interaction, and a high QACs loading performed better than a low loading at around pH 3.
机译：四环素（TC）是一种兽用抗生素，经常被视为环境中的污染物。去除TC需要强大的吸附剂。本文比较了钠蒙脱石（Na-mont）和六种有机蒙脱石（organo-monts）的TC吸附能力。具有不同烷基链长度的三个季铵阳离子（QAC）被用作改性剂。粉末X射线衍射表明，有机蒙特的d_（001）值随着QAC的负载和烷基链长度的增加而增加。有机蒙山的CEC明显低于Na-mont，并且随着QAC链长和负载增加而降低。吸附动力学模型表明，TC-吸附在被测样品上的过程可以通过拟二阶方程很好地拟合。 TC在有机monts上的最大吸附容量（1000-2000 mmol / kg）明显高于Na-mont上的最大吸附容量（769mmol / kg）。 Langmuir模型和Freundlich模型都可以拟合吸附等温线。由于静电相互作用，随着pH值降低至5.5以下，TC吸附到有机物上的吸附量显着增加，并且高QAC负载的性能优于在pH 3左右的低负载。

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  • 来源
    《Journal of Hazardous Materials》 |2012年第30期|p.28-35|共8页
  • 作者

    Niu Liu; Ming-xia Wang; Ming-ming Liu; Fan Liu; Liping Weng; Luuk K. Koopal; Wen-feng Tan;

  • 作者单位

    College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, PR China;

    College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, PR China;

    College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, PR China;

    College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, PR China;

    Department of Soil Quality, Wageningen University, P.O. Box 8005,6700 EC. Wagneningen, The Netherlands;

    Laboratory of Physical Chemistry and Colloid Science, Wageningen University, Dreijenplein 6, 6703 HB Wageningen, The Netherlands;

    College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, PR China,State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences & Ministry of Water Resources, Yangling, Shanxi 712100, 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

    veterinary antibiotic; tetracycline; montmorillonite; organo-montmorillonite; adsorption and pH; kinetics;

    机译：兽用抗生素四环素;蒙脱石有机蒙脱土吸附和pH值;动力学;

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