Researchers using ultrabright x-rays reveal the molecular structure of membranes used to purify seawater into drinking water.
For the first time, a team of researchers from Stony Brook University and the U.S. Department of Energy’s (DOE) Brookhaven National Laboratory have revealed the molecular structure of membranes used in reverse osmosis. The research is reported in a recently published paper in ACS Macro Letters, a journal of the American Chemical Society (ACS).
Reverse osmosis is the leading method of converting brackish water or seawater into potable or drinking water, and it is used to make about 25,000 million gallons of fresh water a day globally according to the International Water Association.
“Most of the earth’s water is in the oceans and only three percent is fresh water, so water purification is an essential tool to satisfy the increasing demand for drinking water,” said Brookhaven Lab senior scientist Benjamin Ocko. “Reverse osmosis is not a new technology; however, the molecular structure of many of the very thin polymer films that serve as the barrier layer in reverse osmosis membranes, despite its importance, was not previously known.”
Image: Qinyi Fu, Francisco J. Medellin-Rodriguez, Nisha Verma, and Benjamin Ocko (from left to right) prepare to mount the membrane samples that mimic the membranes used in reverse osmosis for the measurements in the Complex Materials Scattering (CMS) beamline at the National Synchrotron Light Source II (NSLS-II).