Japanese researchers have introduced a new method for capturing water from the air.

A new study from a team at Osaka Metropolitan University provides a promising solution to water scarcity while slashing energy requirements.

Water-adsorption polymers, long used in atmospheric water harvesting and desiccant air conditioning, typically need heat above 100°C to release absorbed water. 

Now, a new liquid moisture adsorbent achieves the same effect at just 35°C. 

This development could transform the accessibility and efficiency of water harvesting systems.

The research team accomplished this by combining polyethylene glycol (PEG) and polypropylene glycol (PPG) in random copolymers. 

PEG attracts water strongly, while PPG has a weaker affinity. This difference in hydrophilicity induces a mechanism that breaks water clusters, allowing easier desorption. 

The flexible design of liquid adsorbents adds versatility to the applications, making them suitable for more compact and adaptable devices.

“This technology has the potential to be applied not only to water supply in arid regions and places with limited energy resources, but also to ensuring access to water in times of disaster and emergency,” Assistant Professor Arisa Fukatsu said. 

The team also sees broader environmental benefits. 

“Improvements to this technology are also expected to lead to reductions in greenhouse gases and more efficient use of water resources,” added Professor Masahide Takahashi.

Published in ACS ES&T Water, the findings hint at a future where water harvesting systems are more sustainable and practical. 

Further research aims to refine the liquid adsorbent and boost the efficiency of the overall system.

The breakthrough shows how a simple differential in water-loving properties could help address global water challenges.

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