https://www.ethz.ch/en/news-and-events/eth-news/news/2016/01/highly-efficient-heavy-metal-ions-filter.html#comment
ETH researchers have developed a new water filtration system that is superior to existing systems in many respects: it is extremely efficient at removing various toxic heavy metal ions and radioactive substances from water and can even be used in gold recovery. In November, Brazil experienced an unparalleled environmental disaster.