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首页> 外文期刊>Environmental Science & Technology >Stability and Aggregation Kinetics of Titania Nanomaterials under Environmentally Realistic Conditions
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Stability and Aggregation Kinetics of Titania Nanomaterials under Environmentally Realistic Conditions

机译：环境现实条件下二氧化钛纳米材料的稳定性和聚集动力学

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摘要

Nanoparticle morphology is expected to play a significant role in the stability, aggregation behavior, and ultimate fate of engineered nanomaterials in natural aquatic environments. The aggregation kinetics of ellipsoidal and spherical titanium dioxide (TiO_2) nanoparticles (NPs) under different surfactant loadings, pH values, and ionic strengths were investigated in this study. The stability results revealed that alteration of surface charge was the stability determining factor. Among five different surfactants investigated, sodium citrate and Suwannee river fulvic acid (SRFA) were the most effective stabilizers. It was observed that both types of NPs were more stable in monovalent salts (NaCl and NaNO_3) as compared with divalent salts (Ca(NO_3)_2 and CaCl_2). The aggregation of spherical TiO_2 NPs demonstrated a strong dependency on the ionic strength regardless of the presence of mono or divalent salts; while the ellipsoids exhibited a lower dependency on the ionic strength but was more stable. This work acts as a benchmark study toward understanding the ultimate fate of stabilized NPs in natural environments that are rich in Ca(CO_3)_2, NaNO_3, NaCl, and CaCl_2 along with natural organic matters.
机译：纳米粒子形态有望在天然水生环境中对工程纳米材料的稳定性，聚集行为和最终命运起重要作用。研究了在不同的表面活性剂负载，pH值和离子强度下，椭圆形和球形的二氧化钛（TiO_2）纳米颗粒（NPs）的聚集动力学。稳定性结果表明，表面电荷的变化是稳定性的决定因素。在所研究的五种不同的表面活性剂中，柠檬酸钠和Suwannee河黄腐酸（SRFA）是最有效的稳定剂。观察到，与二价盐（Ca（NO_3）_2和CaCl_2）相比，两种类型的NP在单价盐（NaCl和NaNO_3）中都更稳定。球形TiO_2 NPs的聚集表现出对离子强度的强烈依赖性，无论是否存在一价或二价盐；椭球对离子强度的依赖性较低，但更稳定。这项工作作为基准研究，旨在了解在富含Ca（CO_3）_2，NaNO_3，NaCl和CaCl_2以及天然有机物质的自然环境中稳定的NP的最终命运。

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  • 来源
    《Environmental Science & Technology》 |2016年第16期|8462-8472|共11页
  • 作者

    Ghulam Raza; Muhammad Amjad; Inder Kaur; Dongsheng Wen;

  • 作者单位

    School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JU, United Kingdom;

    School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JU, United Kingdom;

    School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom;

    School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, P. R. China,School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JU, United Kingdom;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
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