Skip to Content

What Will It Take to Commercialize Better Desalination Technologies?

An update on research into whether graphene could make it easier to remove salt from seawater.

The World Health Organization estimates that 750 million people lack access to safe water sources, while many more have insufficient supplies because of droughts like the one in California. Creating fresh water through desalination of the ocean or briny water on land is still expensive, mainly because of the energy required to push water through membranes that filter out the salt (see “How Can Desalination Become Cheaper?” and “Desalination Out of Desperation”). In recent months, scientists have published research that advances our understanding of the prospects for better membranes made out of the superstrong and lightweight material graphene.

A rendering of the structure of graphene.

Single crystals

In the March 23 issue of Nature Nanotechnology, researchers at Oak Ridge National Laboratory described how they made a graphene membrane for desalination from layering carbon atoms in a honeycomb structure. These atoms form a hexagon-shaped crystal that measures about 0.1 millimeters in width and length, with holes smaller than a nanometer designed to let water through and block salt. A desalination membrane made of this graphene crystal would ideally have to be measured in meters to work in a commercial plant, says Oak Ridge researcher Ivan Vlassiouk. He says the team has scaled this membrane material up to several millimeters so far.

Sealing leaks

MIT researchers have shown it is possible to use sheets of graphene as a desalination membrane by attaching it to a polycarbonate support structure. However, defects tend to form in the graphene, which can weaken the membrane and possibly let salt or other contaminants through. In an April 27 Nano Letters paper, the MIT researchers and authors from Oak Ridge and Saudi Arabia’s King Fahd University of Petroleum and Minerals appear to have found a way to fix this. The team filled in the larger defects with nylon and deposited hafnium metal followed by a layer of oxide to smaller defect areas.

Computer design

Graphene’s strength, thinness, and chemical properties could make it the “ultimate” membrane material for desalination, MIT researchers David Cohen-Tanugi and Jeffrey Grossman wrote in a paper reviewing some of the progress researchers have made. They describe how computer simulations have helped researchers understand the chemical properties of the nanopores poked into the material; how water flows through these openings; and how well the membranes can retain their strength over time. The paper was featured in the June 15 issue of Desalination.

The Takeaway:

Oak Ridge’s Vlassiouk says it could take at least a decade to commercialize graphene desalination. While graphene could theoretically make for membranes that process water more quickly with less energy, the cost savings that would be associated with using them remain unclear.

Do you have a big question? Send suggestions to

Deep Dive


Five poems about the mind

DREAM VENDING MACHINE I feed it coins and watch the spring coil back,the clunk of a vacuum-packed, foil-wrappeddream dropping into the tray. It dispenses all kinds of dreams—bad dreams, good dreams,short nightmares to stave off worse ones, recurring dreams with a teacake marshmallow center.Hardboiled caramel dreams to tuck in your cheek,a bag of orange dreams…

Work reinvented: Tech will drive the office evolution

As organizations navigate a new world of hybrid work, tech innovation will be crucial for employee connection and collaboration.

lucid dreaming concept
lucid dreaming concept

I taught myself to lucid dream. You can too.

We still don’t know much about the experience of being aware that you’re dreaming—but a few researchers think it could help us find out more about how the brain works.

panpsychism concept
panpsychism concept

Is everything in the world a little bit conscious?

The idea that consciousness is widespread is attractive to many for intellectual and, perhaps, also emotional
reasons. But can it be tested? Surprisingly, perhaps it can.

Stay connected

Illustration by Rose WongIllustration by Rose Wong

Get the latest updates from
MIT Technology Review

Discover special offers, top stories, upcoming events, and more.

Thank you for submitting your email!

Explore more newsletters

It looks like something went wrong.

We’re having trouble saving your preferences. Try refreshing this page and updating them one more time. If you continue to get this message, reach out to us at with a list of newsletters you’d like to receive.