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首页> 外文期刊>Environmental Science & Technology >Porous Ceramic Tablet Embedded with Silver Nanopatches for Low-Cost Point-of-Use Water Purification
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Porous Ceramic Tablet Embedded with Silver Nanopatches for Low-Cost Point-of-Use Water Purification

机译：嵌入纳米银的多孔陶瓷片可用于低成本的使用点水净化

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摘要

This work describes a novel method to embed silver in ceramic porous media in the form of metallic silver nanopatches. This method has been applied to develop a new POU technology, a silver-infused ceramic tablet that provides long-term water disinfection. The tablet is fabricated using clay, water, sawdust, and silver nitrate. When dropped into a household water storage container, the ceramic tablet releases silver ions at a controlled rate that in turn disinfect microbial pathogens. Characterization of the silver-embedded ceramic media was performed using transmission electron microscopy. Spherical-shaped patches of metallic silver were observed at 1-6 nm diameters and confirmed to be silver with energy dispersive spectroscopy. Disinfection experiments in a 10 L water volume demonstrated a 3 log reduction of Escherichia coli within 8 h while silver levels remained below the World Health Organization drinking water standard (0.1 mg/L). Silver release rate varied with clay mineralogy, sawdust particle size, and initial silver mass. Silver release was repeatable for daily 10 L volumes for 154 days. Results suggest the ceramic tablet can be used to treat a range of water volumes. This technology shows great potential to be a low-cost, simple-to-use water treatment method to provide microbiologically safe drinking water at the household level.
机译：这项工作描述了一种以金属银纳米片的形式将银嵌入陶瓷多孔介质中的新方法。该方法已被用于开发一种新的POU技术，一种注银陶瓷片，可提供长期的水消毒。该片剂使用粘土，水，锯末和硝酸银制成。当放入家用储水容器中时，陶瓷片会以受控的速率释放银离子，从而对微生物病原体进行消毒。使用透射电子显微镜对嵌入银的陶瓷介质进行表征。在1-6nm的直径处观察到球形的金属银块，并且通过能量色散光谱法确认为银。在10升水量的消毒实验中，大肠杆菌在8小时内减少了3 log，而银含量仍低于世界卫生组织的饮用水标准（0.1 mg / L）。银的释放速率随粘土矿物学，锯末粒度和初始银质量而变化。每天10 L的体积可重复154天释放银。结果表明，陶瓷片可用于处理各种水量。该技术显示出一种低成本，易于使用的水处理方法的巨大潜力，该方法可为家庭提供微生物安全的饮用水。

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  • 来源
    《Environmental Science & Technology》 |2014年第23期|13901-13908|共8页
  • 作者

    Beeta Ehdaie; Carly Krause; James A. Smith;

  • 作者单位

    Department of Civil and Environmental Engineering, University of Virginia, Charlottesville, Virginia 22904, United States;

    Department of Civil and Environmental Engineering, University of Virginia, Charlottesville, Virginia 22904, United States;

    Department of Civil and Environmental Engineering, University of Virginia, Charlottesville, Virginia 22904, United States;

  • 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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