Feb 122018
 

A scanning electron microscope image of metal-organic frameworks, crystals that can separate lithium from seawater
Credit: CSIRO

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 at Austin professor and his research team may have a solution.

Benny Freeman, professor in the McKetta Department of Chemical Engineering in the Cockrell School of Engineering, and his colleagues at the Monash University Department of Chemical Engineering and the Commonwealth Scientific and Industrial Research Organisation (CSIRO) in Australia have recently discovered a new, efficient way to extract lithium and other metals and minerals from water. They published their findings in the Feb. 9 issue of 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 and potential economic growth opportunities in Texas.

The Barnett and Eagle Ford shale formations in Texas contain high amounts lithium, and the produced wastewater generated by hydraulic fracturing in those areas has high concentrations of lithium. Instead of discarding the produced water, the team’s membrane filter could extract the resulting lithium and put it to use in other industries.

“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,” Freeman said.

Each well in the Barnett and Eagle Ford can generate up to 300,000 gallons of produced water per week. Using their new process, Freeman and his team conservatively estimate 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.

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 methods.

The team’s material operates on principles inspired by highly effective biological cell membranes, whose mechanism of operation was discovered by Roderick MacKinnon and Peter Agre and 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,” said Anita Hill, CSIRO’s chief scientist.

Learn more: New Lithium Collection Method Could Boost Global Supply

 

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