Let's' clean up the water in the environment & oceans first ... With such wonderful Tech ... Leave a clean legacy !

Doesn't simple solar evaporation do the same? The water vapour will need something to condense it, what will that be? How would one collect the condensed vapour from a flat sheet?

But how is the fresh water collected? It is certainly not made clear and I'm having trouble imagining any viable method. Maybe I just get down there and slurp it off with my drinking straw, knee deep in the miry bog that's my water source?

Has graphene actually delivered on any of it's promises yet? It seems like we've been hearing for years and years all of the things it can do cheaply and effectively. That it's going to revolutionize tech. But is there a single example of it actually being used in the real world? If so, I'd love to learn about it.

Is this really a high tech solar still, the fresh water collected as a condensate? The graphic seems to suggest water vapor, but the writer offers no explanation.

Crux#1: 'dry' graphene oxide. Crux #2: mutations of active bacteria due to E. coli & their ilk. I hate nay-say thoughts, but still ....

You don't need a graphene and cellulose bilayer. Just leave it out of the thing that's using solar energy to distill water. The water will still evaporate. The water vapor will still condense on whatever surface is cool enough to make the water condense, and you still end up with distilled water. All the salt and other contaminants, other than volatile contaminants, will stay in the pond whether you put the graphene and cellulose sheet on top or not.

Have you tried to see how well this foam can desalinate sea water? How tolerant is this of contamination and when the pores are filled with debris can it be flushed or backwashed effectively? As this gets to a demonstration plant level of development one excellent test application would be to separate water at Fukushima Daichi. Tepco has absolutely thousands of gallons of contaminated water flushed through the damaged nuclear power plants. Right now Tepco has just been building and filling large tanks as rapidly as possible. It would be a lot better if Tepco could filtre the contaminated water well enough to return it to the sea.

What is the clean water production rate per square foot of membrane per hour of sunshine?
Is the purification of sea water possible with this membrane?

A video clip could have helped better understanding. Any sample available for trials ?