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New Methods Extract Lithium from Water
New Methods Extract Lithium from Water
Researchers discovered a highly efficient way to extract lithium and other metals and minerals from water and published their findings in Science Advances.
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With continual technological advancements in mobile devices and electric cars, the global demand for lithium has quickly outpaced the rate at which it can be mined or recycled. 

But, a University of Texas professor and his research team from Australia and Texas may have a solution.  

They recently discovered a new, highly efficient way to extract lithium and other metals and minerals from water and published their findings in the journal, Science Advances.  

The team's technique uses a metal-organic-framework membrane that mimics the filtering function, or "ion selectivity," of biological cell membranes.  

The membrane process, easily and efficiently separates metal ions, opening the door to revolutionary technologies in the water and mining industries that could create another huge economic growth opportunity in Texas.  

The Barnett and Eagle Ford shale formations in Texas are the epicenter of the fracking revolution.

And significantly, they contain high concentrations of lithium. And it has been found that wastewater generated by hydraulic fracturing in those areas has high concentrations of lithium.  Instead of discarding that water, the team's membrane filter could extract the resulting lithium and put it to use in other industries.   So-called, "produced water" from shale gas fields in Texas is rich in lithium. 

Advanced separation materials concepts such as ours could potentially turn this waste stream into a resource recovery opportunity.  Amazingly, each well in the Barnett and Eagle Ford can generate up to 300,000 gallons of produced water per week. 

Using their new process, UT team conservatively estimates that from just one week's worth of produced water, enough lithium can be recovered to power 200 electric cars or 1.6 million smartphones.   

With thousands of wells being operating in the Barnett and Eagle Ford, the implications are huge. In addition, the team's process could help with water desalination. 

Unlike the existing reverse-osmosis membranes responsible for more than half of the world's current water desalination capacity, the new membrane process dehydrates ions as they pass through the membrane channels and removes only select ions, rather than indiscriminately removing all ions.  

The result is a process that costs less and consumes less energy than conventional reverse-osmosis. The new material operates on principles inspired by highly effective biological cell membranes, whose mechanism of operation was the subject of the 2003 Nobel Prize in chemistry.  

The prospect of using metal-organic frameworks for sustainable water filtration is incredibly exciting from a public-good perspective, while delivering a better way of extracting lithium ions to meet global demand could create new industries.  
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