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首页> 外文期刊>Environmental Science & Technology >Sorption of Non-ionic Aromatic Organics to Mineral Micropores: Interactive Effect of Cation Hydration and Mineral Charge Density
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Sorption of Non-ionic Aromatic Organics to Mineral Micropores: Interactive Effect of Cation Hydration and Mineral Charge Density

机译：非离子芳香有机物对矿物微孔的吸附：阳离子水化与矿物电荷密度的相互作用

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摘要

The influence of K+ and Ca2+ on the sorption of non-ionic aromatic contaminants (1,4-dinitrobenzene and p-xylene) on a series of microporous zeolite minerals (HZSM-5) with various surface charge densities was investigated. For zeolites with high or low charge density (1.78 or 0.16 sitesm(2)), K+ and Ca2+ had negligible influence on the sorption of organics, which mainly occurred at the hydrophobic nanosites. For zeolites with charge density in the moderate range (0.16-1.78 sitesm(2)), the sorption of organics was strongly dependent upon the cation hydration effect. K+ with a lower hydration free energy greatly favored sorption of organics to the micropores compared to Ca2+. Differential scanning calorimetry and X-ray photoelectron spectroscopy results indicated that K+ can reduce the water affinity and promote specific sorption of organics in the zeolites with moderate charge density. The above mechanisms were successfully applied to explain the retention of 1,4-dinitrobenzene and p-xylene on four natural minerals (smectite, illite, kaolinite, and mordenite). This study shed new insights on how cation hydration influences sorption interactions of non-ionic aromatic contaminants at mineral water interfaces as a function of the mineral charge density.
机译：研究了K +和Ca2 +对一系列表面电荷密度不同的微孔沸石矿物（HZSM-5）吸附非离子芳族污染物（1,4-二硝基苯和对二甲苯）的影响。对于具有高或低电荷密度（> 1.78或<0.16个位点/ nm（2））的沸石，K +和Ca2 +对有机物的吸附影响可忽略不计，这主要发生在疏水性纳米位点。对于具有中等范围电荷密度（0.16-1.78个位点/ nm（2））的沸石，有机物的吸附强烈依赖于阳离子水化作用。与Ca2 +相比，具有较低水合自由能的K +极大地促进了有机物对微孔的吸附。差示扫描量热法和X射线光电子能谱结果表明，K +可以降低水中的亲和力，并以中等电荷密度促进沸石中有机物的特异性吸附。上述机理已成功地用于解释1，4-二硝基苯和对二甲苯在四种天然矿物（蒙脱石，伊利石，高岭石和丝光沸石）上的保留。这项研究揭示了阳离子水合如何影响矿物质水界面上非离子芳族污染物在矿泉水界面的吸附相互作用的新见解。

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  • 来源
    《Environmental Science & Technology》 |2019年第6期|3067-3077|共11页
  • 作者

    Hu Erdan; Zhao Xinglei; Pan Shangyue; Ye Ziwei; He Feng;

  • 作者单位

    Zhejiang Univ Technol, Coll Environm, Hangzhou 310014, Zhejiang, Peoples R China;

    Zhejiang Univ Technol, Coll Environm, Hangzhou 310014, Zhejiang, Peoples R China;

    Zhejiang Univ Technol, Coll Environm, Hangzhou 310014, Zhejiang, Peoples R China;

    Zhejiang Univ Technol, Coll Environm, Hangzhou 310014, Zhejiang, Peoples R China;

    Zhejiang Univ Technol, Coll Environm, Hangzhou 310014, Zhejiang, Peoples R 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);
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