Seawater desalination has always been the subject of urgent need to overcome in the field of water treatment. This time, the University of Manchester science team went further on the graphene oxide film and succeeded in making a "sieve" capable of screening out ions. Allegedly, graphene oxide film has been able to block the larger salts, the breakthrough of this study is that you can precisely control the pore size in the membrane, filtered out of ordinary salt from salt water to ensure drinking safety.
Precise control of the "sieve" pore seawater desalination technology and then upgrade
Scientists use graphene to make "sieves" that filter out salt ions.
It is understood that the new findings of the University of Manchester scientists have been published in the "natural environment is very good and the old rare 4 barista? Allow? That look 笄 stretched Γ ?? and Ah? Restore な mourning sprouts miscellaneous interpretation? Said 粜 ∧ good Zhuo Pa #? Xie swollen by 踔 scolded Papaver Q Wei 芰 H AH Huan ┭ fans 锬 げ⒉ wild yi Mi remonstrance Fu Wei Wei 际 际 踔 Wei Jian sodium defluoridation 啵 啵?
Earlier studies at the University of Manchester found that graphene oxide membranes can swell if immersed in water, although smaller membranes can block larger salts, though smaller salts can pass through the membrane with water.
The team of Manchester scientists has now further developed these graphene films and found a way to avoid swelling of the graphene oxide film when exposed to water. Currently, they have been able to precisely control the pore size in the graphene oxide film, so that ordinary salt can be filtered out of salt water to ensure drinking safety.
When common salts dissolve in water, they always form "shells" of water molecules around the salt molecules. This allows the fine capillary barrier salt of the graphene oxide film to flow with the water. Those independent water molecules pass through the membrane barrier and pass quite quickly.
Professor Rahul Nair of the University of Manchester said: "Achieving the determination of pore size on an atomic scale is a significant step forward that will open up new possibilities for increasing the efficiency of desalination technologies."
"This is the first clear experiment in this area and we have also demonstrated that we can mass-produce graphene membranes with various pore sizes by changing the pore size."
Desalination technology
As the effects of climate change continue to reduce the water supply in modern cities, wealthy developed countries are also investing in desalination technologies. Following the severe floods in California, the major affluent cities are also increasingly seeking alternative water solutions.
The UN estimates that by 2025, 14% of the world's population will experience water shortages. This graphene oxide film technology has the potential to revolutionize water filtration systems around the world, especially in countries where large desalination plants can not be built.
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