Antibiotic-heavy metal multi-pollutants are produced by intensive livestock farming and become an increasingly prominent problem. In this study, the transport behavior of tetracycline (TC) and its chelate with copper ions (Cu-TC) in saturated sand column with and without graphene oxide (GO) prefilled was investigated by laboratory breakthrough experiments. The effects of pH, ionic strength, and the cotransport with GO were studied detailedly. The results showed that the prepared nano-GO had a single- or multilayered sheet structure with a diameter of several μm. The surface of GO contained abundant oxygen-containing functional groups, which imparted it strong hydrophilicity and electronegativity. Pollutant transport experiments showed that decrease of H+ weakened the transport ability of TC and Cu-TC. Both Na+ and Ca2+ promoted the transport of TC, with Ca2+ having a much greater effect. The presence of Na+ inhibited the transport of Cu-TC, while Ca2+ promoted Cu-TC transport. The addition of Cu2+ was more favorable for the transport of Cu-TC than TC alone. In the GO-prefilled column, the effluent concentrations of TC and Cu-TC greatly decreased due to adsorption onto GO surfaces. The transport of Cu-TC was more related to GO concentration than TC alone due to the high affinity between GO and Cu-TC. Moreover, the transport behavior of GO in the sand column was consistent with that of the corresponding TC or Cu-TC, indicating that GO could cotransport with TC and Cu-TC multi-pollutants. Our study showed that the GO would interact with TC and Cu-TC and thus have significant influences on the fate and transport of these pollutions in porous media.

中文翻译：

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氧化石墨烯纳米片对cu-四环素多污染物在饱和多孔介质中共迁移的影响。

密集的畜牧业生产出抗生素重金属多污染物，并成为日益突出的问题。在这项研究中，通过实验室突破实验研究了四环素（TC）及其螯合物与铜离子（Cu-TC）在饱和和不填充氧化石墨烯（GO）的饱和砂柱中的传输行为。详细研究了pH，离子强度以及与GO共迁移的影响。结果表明，制备的纳米GO具有直径为几μm的单层或多层片状结构。GO的表面含有丰富的含氧官能团，赋予其强的亲水性和电负性。污染物迁移实验表明，H +的减少削弱了TC和Cu-TC的迁移能力。Na +和Ca2 +都促进了TC的转运，Ca2 +具有更大的作用。Na +的存在抑制了Cu-TC的运输，而Ca2 +促进了Cu-TC的运输。Cu 2+的添加比单独的TC更有利于Cu-TC的运输。在GO预填充塔中，由于吸附在GO表面上，TC和Cu-TC的流出物浓度大大降低。由于GO和Cu-TC之间的高亲和力，Cu-TC的转运与GO浓度比单独的TC更相关。此外，GO在砂柱中的迁移行为与相应的TC或Cu-TC一致，表明GO可以与TC和Cu-TC多种污染物共迁移。我们的研究表明，GO会与TC和Cu-TC相互作用，从而对这些污染物在多孔介质中的命运和迁移产生重大影响。Na +的存在抑制了Cu-TC的运输，而Ca2 +促进了Cu-TC的运输。Cu 2+的添加比单独的TC更有利于Cu-TC的运输。在GO预填充塔中，由于吸附在GO表面上，TC和Cu-TC的流出物浓度大大降低。由于GO和Cu-TC之间的高亲和力，Cu-TC的转运与GO浓度比单独的TC更相关。此外，GO在砂柱中的迁移行为与相应的TC或Cu-TC一致，表明GO可以与TC和Cu-TC多种污染物共迁移。我们的研究表明，GO会与TC和Cu-TC相互作用，从而对这些污染物在多孔介质中的命运和迁移产生重大影响。Na +的存在抑制了Cu-TC的运输，而Ca2 +促进了Cu-TC的运输。Cu 2+的添加比单独的TC更有利于Cu-TC的运输。在GO预填充塔中，由于吸附在GO表面上，TC和Cu-TC的流出物浓度大大降低。由于GO和Cu-TC之间的高亲和力，Cu-TC的转运与GO浓度比单独的TC更相关。此外，GO在砂柱中的迁移行为与相应的TC或Cu-TC一致，表明GO可以与TC和Cu-TC多种污染物共迁移。我们的研究表明，GO会与TC和Cu-TC相互作用，从而对这些污染物在多孔介质中的命运和迁移产生重大影响。Cu 2+的添加比单独的TC更有利于Cu-TC的运输。在GO预填充塔中，由于吸附在GO表面上，TC和Cu-TC的流出物浓度大大降低。由于GO和Cu-TC之间的高亲和力，Cu-TC的转运与GO浓度比单独的TC更相关。此外，GO在砂柱中的迁移行为与相应的TC或Cu-TC一致，表明GO可以与TC和Cu-TC多种污染物共迁移。我们的研究表明，GO会与TC和Cu-TC相互作用，从而对这些污染物在多孔介质中的命运和迁移产生重大影响。Cu 2+的添加比单独的TC更有利于Cu-TC的运输。在GO预填充塔中，由于吸附在GO表面上，TC和Cu-TC的流出物浓度大大降低。由于GO和Cu-TC之间的高亲和力，Cu-TC的转运与GO浓度比单独的TC更相关。此外，GO在砂柱中的迁移行为与相应的TC或Cu-TC一致，表明GO可以与TC和Cu-TC多种污染物共迁移。我们的研究表明，GO会与TC和Cu-TC相互作用，从而对这些污染物在多孔介质中的命运和迁移产生重大影响。由于吸附在GO表面，TC和Cu-TC的出水浓度大大降低。由于GO和Cu-TC之间的高亲和力，Cu-TC的转运与GO浓度比单独的TC更相关。此外，GO在砂柱中的迁移行为与相应的TC或Cu-TC一致，表明GO可以与TC和Cu-TC多种污染物共迁移。我们的研究表明，GO会与TC和Cu-TC相互作用，从而对这些污染物在多孔介质中的命运和迁移产生重大影响。由于吸附在GO表面，TC和Cu-TC的出水浓度大大降低。由于GO和Cu-TC之间的高亲和力，Cu-TC的转运与GO浓度比单独的TC更相关。此外，GO在砂柱中的迁移行为与相应的TC或Cu-TC一致，表明GO可以与TC和Cu-TC多种污染物共迁移。我们的研究表明，GO会与TC和Cu-TC相互作用，从而对这些污染物在多孔介质中的命运和迁移产生重大影响。表明GO可以与TC和Cu-TC多污染物共运输。我们的研究表明，GO会与TC和Cu-TC相互作用，从而对这些污染物在多孔介质中的命运和迁移产生重大影响。表明GO可以与TC和Cu-TC多污染物共运输。我们的研究表明，GO会与TC和Cu-TC相互作用，从而对这些污染物在多孔介质中的命运和迁移产生重大影响。