Based on an “acid-assisted cool welding” technology which was realized by virtue of the freezing process in the presence of acid, nanoscaled gold (Au) and silver (Ag) from wastewater could be removed very facilely and efficiently. The technology was independence of the freezing temperature, size as well as shape of those nanoscaled units. Besides, some functional materials like porous nanostructures with highly and stably catalytic activity could be also obtained during the removal. Our research not only provided a new method to remove nanoscaled Ag or Au from wastewater, but also built up a unique route to transform those nano-units into functional materials simultaneously.

中文翻译：

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纳米级金和银：同时去除和转化为功能材料

基于在酸的存在下通过冷冻过程实现的“酸辅助冷焊”技术，可以非常轻松，高效地去除废水中的纳米级金（Au）和银（Ag）。该技术与冷冻温度，尺寸以及这些纳米级单位的形状无关。此外，在去除过程中还可以获得一些功能性材料，例如具有高度且稳定的催化活性的多孔纳米结构。我们的研究不仅提供了一种从废水中去除纳米级Ag或Au的新方法，而且还建立了一条独特的途径将这些纳米单元同时转化为功能材料。