Three-quarters of the Earth's area is covered by the ocean. In the face of such huge water reserves, scientists have also brainstormed – because the concentration is too high and there are many impurities, seawater cannot be directly used. However, in the recently published "Science" magazine, a group of researchers made breakthroughs in the rapid screening of ionization of graphene oxide films, and found that it has the performance of precise and rapid screening of ions. This achievement is expected to be applied in the field of desalination.
With sophisticated and fast screening
Graphene is a magical material with some unique characteristics that have been favored by scientists in recent years. For example, its excellent electrical conductivity makes people very optimistic about them in the transistor field. It is almost completely transparent and may have a lot to do with solar cells or touch screens. However, the interaction between graphene and water is not well understood. It is known that the surface of graphene is water repellent, but the capillary channel in the graphene film immersed in water allows rapid penetration of water.
The latest collaborative research shows that the graphene oxide film in the water environment will form a capillary channel of about 0.9 nm wide under hydration, and only ions or molecules with a hydration radius less than or equal to 0.45 nm can pass, and ions with a radius greater than 0.45 nm. Or the molecule will be completely blocked on the other side. This screening effect not only requires very precise ion size requirements, but is thousands of times faster than classical concentration diffusion.
This latest research result is Professor Wu Hengan and Dr. Wang Fengchao from the Key Laboratory of Materials Mechanics Behavior and Design of the Department of Modern Mechanics, School of Engineering Science, University of Science and Technology of China, and the University of Manchester, 2010, Nobel Prize in Physics, Ander Prof. Lie Heim's research team completed the cooperation.
Professor Wu Hengan told reporters that their main contribution in this work was to study the mechanism of rapid filtration of ions by graphene nanochannels by theoretical analysis and molecular simulation. Computer simulations have shown that the interaction between graphene and ions causes ions to accumulate in the nanochannels, resulting in a higher concentration gradient. This finding gives a reasonable explanation for the experimental results, also known as the "ion sponge effect."
Or can be applied to desalinated seawater
How fine is the 0.9 nanometer capillary channel? Professor Wu Hengan answered the reporter's question.
"The 0.9nm channel can block larger ions by water and small ions, such as NaCl," he said, so the current graphene oxide film is temporarily unable to filter out the salt in seawater. “The current idea is to take a special approach to further compress the size of the capillary channel in the film, narrowing the channel and preventing the passage of NaCl, but this is only an idea. The work we have done is only a step towards desalination. â€
One of the collaborators, Dr. Irina Gouriguliva, said that if this idea can be realized, it means creating a filter device that can desalinate a cup of seawater into drinking water in a matter of minutes. Fiction scene.
"Science" magazine also made a detailed review of the research results, which is believed to make the graphene oxide film important in many separation applications, such as desalination and purification, sensing technology and energy conversion. The field has broad application prospects.
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