The Chernobyl and Fukushima nuclear disasters released deadly radioactive isotope Caesium-137 into the water supply. Researchers at the Hebrew University in Jerusalem have developed a new material known as the Alloxan Tray, that can bind Caesium-137 in water, thereby purifying it.

https://www.jewishpress.com/news/on-campus/hebrew-u-developed-water-purification-of-nuclear-waste/2019/01/28/