Scientists Build Solar Desalination System That Turns Seawater Into Drinking Water and Recovers Lithium

Level 2 - Elementary

Scientists at the University of Rochester have created a solar desalination system that can turn seawater into fresh drinking water using only sunlight. Desalination means removing salt from water. Most desalination systems use a lot of electricity and produce a thick salty waste called brine that is hard to dispose of.

The new system uses a special surface made by laser technology. The surface has tiny patterns that pull water and salt to the edges of the panel. This stops salt from building up in the middle, which normally breaks most desalination devices. The researchers called this property 'superwicking'.

As the salt moves to the edges, it concentrates enough for the scientists to extract lithium from it. Lithium is a key material in batteries for electric cars and smartphones. The team published their results on May 30, 2026 in a journal called Light: Science and Applications.

desalination: the process of removing salt from seawater to make it drinkable

brine: very salty water left over after desalination

laser: a device that produces a very powerful, narrow beam of light

superwicking: the ability of a surface to move liquid along it very quickly by capillary action

extract: to remove a substance from a mixture

concentrate: to increase the amount of a substance in a smaller volume

dispose of: to get rid of something, especially waste

property: a quality or characteristic belonging to something

Level 3 - Intermediate

A research team at the University of Rochester has engineered a passive solar desalination system that simultaneously produces potable water and recovers battery-grade lithium from seawater. Published May 30, 2026 in Light: Science and Applications, the study presents a solution to one of the oldest problems in desalination technology: salt crystallization on the evaporator surface, which rapidly degrades performance and shortens device lifespans.

The team's innovation is a superwicking surface created by irradiating a titanium substrate with femtosecond laser pulses. The ablation process carves a hierarchical network of micro- and nanostructures that exploit capillary pressure to transport the salt-rich boundary layer away from the hot central zone toward cooler peripheral channels. There, lithium ions are selectively trapped by sodium titanate nanoparticles, achieving approximately 50 percent recovery of the lithium dissolved in typical seawater concentrations.

Beyond clean water production, the system's economic case rests heavily on that lithium recovery. Lithium prices have remained elevated since the electric vehicle boom accelerated demand far ahead of mining supply. The Rochester system's solar-only operation and zero liquid discharge profile make it particularly attractive for remote coastal communities and island nations that currently rely on expensive diesel-powered desalination plants. The researchers estimate that, scaled to a one-square-meter panel, the system could produce five liters of fresh water per hour under peak solar conditions.

potable: safe and clean enough for humans to drink

crystallization: the process by which a dissolved substance forms solid crystals as liquid evaporates

femtosecond laser: an ultra-short pulse laser that fires pulses lasting one quadrillionth of a second

ablation: the removal of material from a surface using a laser or other energy source

capillary pressure: the force that causes liquid to flow through narrow spaces or against gravity

nanoparticles: extremely small particles, typically between 1 and 100 nanometers in size

zero liquid discharge: a system that produces no wastewater, recovering all water and concentrating all dissolved solids

substrate: a base layer of material on which processes or reactions take place

Level 4 - Advanced

A multidisciplinary team at the University of Rochester has reported, in Light: Science and Applications (May 30, 2026), a passive solar desalination architecture that resolves the long-intractable problem of salt fouling while adding a secondary revenue stream: battery-grade lithium recovery. Conventional solar evaporators fail within days because dissolved salts nucleate and crystallize on the heated surface, creating an insulating crust that halts evaporation. The Rochester team circumvents this by structuring the evaporator surface at micro- and nanoscale resolution using femtosecond laser ablation, a non-thermal process that preserves the underlying substrate while generating a hierarchical wicking topology.

The resulting superwicking surface harnesses anisotropic capillary pressure gradients to actively convect the salt-enriched boundary layer from the central hot zone toward peripheral cooler channels, a process the team terms 'salt steering.' At the periphery, a bed of H2Ti3O7 nanoparticles exploits the material's well-documented selectivity for Li+ ions over Na+, Mg2+, and K+, achieving a recovery rate of approximately 50 percent from typical open-ocean concentrations of 0.2 milligrams per liter. The selectivity arises because the titanate's tunnel structure is sterically complementary to the hydrated ionic radius of lithium, excluding larger competing cations.

The system's techno-economic profile is compelling at two scales. At the household level, a one-square-meter panel can yield five liters per hour of potable water under peak solar irradiance, sufficient for daily drinking-water needs in arid coastal regions where piped supply is unreliable. At the industrial scale, the lithium recovery function represents a margin enhancer that could offset capital costs within three to five years, depending on prevailing lithium carbonate spot prices. The zero-liquid-discharge architecture also sidesteps the regulatory and ecological concerns that have stalled conventional concentrate-disposal from large reverse-osmosis plants, particularly in enclosed seas such as the Arabian Gulf and the Mediterranean.

fouling: the gradual blockage or degradation of a surface or membrane by deposited material

anisotropic: having different properties in different directions, enabling directional fluid transport

convect: to transfer heat or material through the movement of a fluid driven by a gradient

sterically complementary: fitting together because the three-dimensional shape of one molecule matches the cavity of another

cation: a positively charged ion, such as Li+, Na+, or K+

irradiance: the power of solar radiation received per unit area, typically measured in watts per square meter

techno-economic: relating to the combined technical performance and economic viability of a system

concentrate-disposal: the process of managing the hyper-saline brine rejected by desalination plants

Level 1 - Absolute Beginner

Level 2 - Elementary

Level 3 - Intermediate

Level 4 - Advanced

Scientists Build Solar Desalination System That Turns Seawater Into Drinking Water and Recovers Lithium

Multiple Choice

True or False

Fill in the Blank