EXCERPT: Washington University in St. Louis has figured out how to combine solar power, graphene, and a common bacteria into one radically simple water purification system. Graphene is an extremely thin, but superstrong material with unique electronic properties. 

It has interested clean tech researchers around the world ever since its discovery in 2004, especially when it comes to solar power and energy storage. One example is seawater desalination. Researchers have created a graphene “mesh” that could lead to a small-scale, rapid, hand-pumped water desalination system.  

http://cleantechnica.com/2016/07/28/solar-powered-graphene-evaporator-zaps-dirty-water/