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首页> 外文期刊>Environmental Science & Technology >Interactions between Organic Model Compounds and Ion Exchange Resins
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Interactions between Organic Model Compounds and Ion Exchange Resins

机译：有机模型化合物与离子交换树脂之间的相互作用

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摘要

Ion exchange (IEX) can successfully remove natural organic matter (NOM) from surface water. However, the removal mechanism is not well understood due to the complexity and variability of NOM in real source waters as well as the influence of multiple parameters on the removal behavior. For example, this includes the physicochemical properties of the NOM and IEX resin, and the presence of competing anions. Model compounds with a range of physical and chemical characteristics were therefore used to determine the mechanisms of NOM removal by IEX resins. Fifteen model compounds were selected to evaluate the influence of hydrophobicity, size, and charge of organic molecules on the removal by ion exchange, both individually and in mixtures. Three different resins, comprising polystyrene and polyacrylic resin of macroporous and gellular structure, showed that charge density (CD) was the most important characteristic that controlled the removal, with CD of >5 mequiv mg(DOC)(-1) resulting in high removal (>= 89%). Size exclusion of compounds with high MW (>= 8 kDa) was evident. The hydrophobicity of the resin and model compound was particularly important for removal of neutral molecules such as resorcinol, which was best removed by the more hydrophobic polystyrene resin. Relationships were identified that provided explanations of the interactions observed between NOM and IEX resin in real waters.
机译：离子交换（IEX）可以成功去除地表水中的天然有机物（NOM）。但是，由于NOM在实际水源中的复杂性和可变性以及多个参数对去除行为的影响，因此对去除机理的了解还不够。例如，这包括NOM和IEX树脂的物理化学性质，以及竞争性阴离子的存在。因此，使用具有一系列物理和化学特性的模型化合物来确定IEX树脂去除NOM的机理。选择了15种模型化合物来评估疏水性，大小和有机分子电荷对离子交换去除的影响，无论是单独使用还是混合使用。三种不同的树脂，包括具有大孔和凝胶状结构的聚苯乙烯和聚丙烯酸酯树脂，表明电荷密度（CD）是控制去除的最重要特征，CD大于5 mequiv mg（DOC）（-1）导致高去除（> = 89％）。具有高MW（> = 8 kDa）的化合物的尺寸排阻是明显的。树脂和模型化合物的疏水性对于去除中性分子（如间苯二酚）尤为重要，而中性分子最好通过疏水性更高的聚苯乙烯树脂去除。所确定的关系可以解释在真实水中NOM和IEX树脂之间观察到的相互作用。

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  • 来源
    《Environmental Science & Technology》 |2019年第16期|9734-9743|共10页
  • 作者

    Finkbeiner Pascal; Moore Graeme; Tseka Tebogo; Nkambule Thabo T. I; De Kock Lueta; Jefferson Bruce; Jarvis Peter;

  • 作者单位

    Cranfield Univ Cranfield Water Sci Inst Bldg 52a Cranfield MK43 0AL Beds England;

    Scottish Water Castle House 6 Castle Dr Dunfermline KY11 8GG Fife Scotland;

    Univ South Africa UNISA Nanotechnol & Water Sustainabil Res Unit ZA-1709 Johannesburg Florida South Africa;

    Cranfield Univ Cranfield Water Sci Inst Bldg 52a Cranfield MK43 0AL Beds England|Univ South Africa UNISA Nanotechnol & Water Sustainabil Res Unit ZA-1709 Johannesburg Florida South Africa;

  • 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);
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