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首页> 外文期刊>Journal of nano research >Transport and Retention Behavior of ZnO Nanoparticles in two Natural Soils: Effect of Surface Coating and Soil Composition
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Transport and Retention Behavior of ZnO Nanoparticles in two Natural Soils: Effect of Surface Coating and Soil Composition

机译：ZnO纳米颗粒在两种天然土壤中的迁移和保留行为：表面涂层和土壤组成的影响

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摘要

The widespread use of nanoparticles (NPs) in consumer goods could put these materials in the waste stream, potentially to soil and sediments. However, little is known about their transport in water and soils. In this study, transport behavior and attachment of ZnO NPs in soil components were studied through column experiments and sequential extraction, respectively. Bare and sodium citrate coated ZnO NP suspended in CaCl_2 solutions at different ionic strengths, were passed through glass columns packed with sandy soils (SS) and sandy loam soils (SLS) and the effluents were analyzed by ICP-OES. The distribution of Zn in soil particles was studied by electron microprobe (EMP). Results showed that 99% of Zn/ZnO NPs was retained in SLS and 68% ~ 99% was retained in SS, for ionic strengths varying from 0 to 1 mM. Travel distances (cm) for bare ZnO NPs in SS and SLS were 19.2 and 5.3, respectively, while for coated NPs the distances were 21.4 and 6.9 cm, respectively. The surface coating reduced deposition rates from 0.73 to 0.65 and from 2.28 to 1.74 for SS and SLS, respectively. In both soils the amounts of uncoated NPs in the exchangeable fraction were less than 1%; however, 30% of coated NPs remained in the exchangeable fraction. EMP mapping showed that Zn/ZnO NPs associated with silica and aluminum, which are indicators of soil clay minerals. Long term observations are still needed to evaluate the bioavailability to plants of Zn released from coated and uncoated ZnO NPs.
机译：消费品中纳米颗粒（NPs）的广泛使用可能会将这些材料放入废物流中，并有可能进入土壤和沉积物。然而，关于它们在水和土壤中的运输知之甚少。在这项研究中，分别通过柱实验和顺序提取研究了ZnO NPs在土壤组分中的迁移行为和附着。分别以不同的离子强度悬浮在CaCl_2溶液中的裸露的柠檬酸钠和柠檬酸钠包裹的ZnO NP，通过装有沙土（SS）和沙壤土（SLS）的玻璃柱，并通过ICP-OES对废水进行分析。用电子探针（EMP）研究了锌在土壤颗粒中的分布。结果表明，离子强度从0到1 mM不等，SLS中保留了Zn / ZnO NPs的99％，SS中保留了68％〜99％的NPs。 SS和SLS中裸露的ZnO NP的行进距离（cm）分别为19.2和5.3，而带涂层的NPS的行进距离分别为21.4和6.9 cm。表面涂层将SS和SLS的沉积速率分别从0.73降低到0.65，从2.28降低到1.74。在两种土壤中，可交换部分中未包被的NP的量均小于1％；但是，有30％的被覆NP保留在可交换部分中。 EMP作图表明，Zn / ZnO NPs与二氧化硅和铝有关，这是土壤黏土矿物的指标。仍然需要长期观察以评估从涂覆和未涂覆的ZnO NP释放出的锌对植物的生物利用度。

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  • 来源
    《Journal of nano research》 |2012年第2012期|p.229-242|共14页
  • 作者

    Lijuan Zhao; Jose R. Peralta-Videa; Jose Angel Hernandez-Viezcas; Jie Hong; Jorge L. Gardea-Torresdey;

  • 作者单位

    Chemistry Department, The University of Texas at EI Paso 500 West Univ. Ave., El Paso, TX 79968, USA;

    Chemistry Department, The University of Texas at EI Paso 500 West Univ. Ave., El Paso, TX 79968, USA;

    Chemistry Department, The University of Texas at EI Paso 500 West Univ. Ave., El Paso, TX 79968, USA;

    Chemistry Department, The University of Texas at EI Paso 500 West Univ. Ave., El Paso, TX 79968, USA;

    Chemistry Department, The University of Texas at EI Paso 500 West Univ. Ave., El Paso, TX 79968, USA Environmental Science and Engineering PhD program, The University of Texas at El Paso, 500 West Univ. Ave., El Paso, Texas 79968, USA;

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  • 正文语种 eng
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  • 关键词

    ZnO nanoparticles; soil column; transport; surface coating, travel distance;

    机译：ZnO纳米颗粒;土柱;运输;表面涂层;行进距离;

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