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首页> 外文期刊>Environmental Science & Technology >Influence of Clay Particles on the Transport and Retention of Titanium Dioxide Nanoparticles in Quartz Sand
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Influence of Clay Particles on the Transport and Retention of Titanium Dioxide Nanoparticles in Quartz Sand

机译：粘土颗粒对石英砂中二氧化钛纳米颗粒迁移和保留的影响

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摘要

This study investigated the influence of two representative suspended clay particles, bentonite and kaolinite, on the transport of titanium dioxide nanoparticles (nTiO_2) in saturated quartz sand in both NaCl (1 and 10 mM ionic strength) and CaCl_2 solutions (0.1 and 1 mM ionic strength) at pH 7. The breakthrough curves of nTiO_2 with bentonite or kaolinite were higher than those without the presence of clay particles in NaCl solutions, indicating that both types of clay particles increased nTiO_2 transport in NaCl solutions. Moreover, the enhancement of nTiO_2 transport was more significant when bentonite was present in nTiO_2 suspensions relative to kaolinite. Similar to NaCl solutions, in CaCl_2 solutions, the breakthrough curves of nTiO_2 with bentonite were also higher than those without clay particles, while the breakthrough curves of nTiO_2 with kaolinite were lower than those without clay partides. Clearly, in CaCl_2 solutions, the presence of bentonite in suspensions increased nTiO_2 transport, whereas, kaolinite decreased nTiO_2 transport in quartz sand The attachment of nTiO_2 onto day partides (both bentonite and kaolinite) were observed under all experimental conditions. The increased transport of nTiO_2 in most experimental conditions (except for kaolinite in CaCl_2 solutions) was attributed mainly to the clay-facilitated nTiO_2 transport. The straining of larger nTiO_2-kaolinite dusters yet contributed to the decreased transport (enhanced retention) of nTiO_2 in divalent CaCl_2 solutions when kaolinite partides were copresent in suspensions.
机译：这项研究调查了两种代表性的悬浮粘土颗粒，膨润土和高岭石，对NaCl（离子强度为1和10 mM）和CaCl_2（离子强度为0.1和1 mM）溶液中饱和石英砂中二氧化钛纳米颗粒（nTiO_2）的迁移的影响。在pH值为7时，nTiO_2与膨润土或高岭石的穿透曲线要高于在不存在粘土颗粒的NaCl溶液中的穿透曲线，这表明两种类型的粘土颗粒都增加了nTiO_2在NaCl溶液中的迁移。此外，相对于高岭石，当nTiO_2悬浮液中存在膨润土时，nTiO_2传输的增强更为显着。与NaCl溶液相似，在CaCl_2溶液中，具有膨润土的nTiO_2的穿透曲线也高于没有粘土颗粒的穿透曲线，而具有高岭石的nTiO_2的穿透曲线低于没有粘土粒子的穿透曲线。显然，在CaCl_2溶液中，悬浮液中膨润土的存在增加了nTiO_2的迁移，而高岭石降低了nTiO_2在石英砂中的迁移。在所有实验条件下，均观察到nTiO_2附着在日间部分（膨润土和高岭石）上。在大多数实验条件下（除了CaCl_2溶液中的高岭石外），nTiO_2的运输增加主要归因于粘土促进的nTiO_2的运输。当在悬浮液中共存高岭土颗粒时，较大的nTiO_2-高岭土dust子的拉紧作用仍导致nTiO_2在二价CaCl_2溶液中的运输（增强保留）降低。

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  • 来源
    《Environmental Science & Technology》 |2014年第13期|7323-7332|共10页
  • 作者

    Li Cai; Meiping Tong; Xueting Wang; Hyunjung Kim;

  • 作者单位

    The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, P. R. China;

    The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, P. R. China;

    The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, P. R. China;

    Department of Mineral Resources and Energy Engineering, Chonbuk National University, Jeonju, Jeonbuk 561-756, Republic of Korea;

  • 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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