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This Breakthrough Sponge Could Change How the World Gets Clean Water

Posted By: NightSky
Date: Monday, 7-Jul-2025 13:45:36
www.rumormill.news/256732

My question is what kind of chemicals are in the hydrogels? Is that going into the 'clean' water?

By American Chemical Society
July 6, 2025

A team of scientists has developed a groundbreaking sponge-like aerogel that can turn seawater into clean drinking water using only sunlight.

Unlike earlier materials, this 3D-printed structure is filled with microscopic vertical channels that enable it to efficiently evaporate water, even at larger scales. During outdoor testing, the sponge produced potable water in just hours, all without electricity or complex infrastructure.

Turning Sunlight Into Freshwater

Most of the water on Earth is found in the oceans, but it’s far too salty to drink. While desalination plants can remove salt and make seawater drinkable, they typically use a lot of energy. Now, researchers have developed a promising new material that could change that.

Reporting in ACS Energy Letters, a team of scientists created a sponge-like structure filled with long, microscopic air channels that harness sunlight to turn saltwater into fresh, clean water. In an outdoor test, this simple system—just the sponge and a clear plastic cover—successfully produced drinkable water using only natural sunlight. It’s a step toward making low-energy, sustainable desalination more accessible.

From Loofahs to Aerogels: The Evolution of Solar Sponges

Scientists have been experimenting with sun-powered materials for water purification for some time. One earlier example used a loofah-inspired hydrogel filled with special polymers. When exposed to sunlight, it heated up and released clean water vapor from polluted water. Hydrogels like this are soft and filled with liquid, but there’s another class of materials—called aerogels—that are more rigid.

These have solid pores and can move water or vapor through their structure. Aerogels have shown promise for desalination, but they often lose efficiency as they scale up in size. To solve this problem, researcher Xi Shen and colleagues set out to design a new type of aerogel that stays just as effective whether it’s small or large.

3D-Printed Sponge Aerogel With Microscopic Channels

The researchers made a paste containing carbon nanotubes and cellulose nanofibers and then 3D-printed it onto a frozen surface, allowing each layer to solidify before the next was added. This process formed a sponge-like material with evenly distributed tiny vertical holes, each around 20 micrometers wide. They tested square pieces of the material, ranging in size from 0.4 inches wide (1 centimeter) to about 3 inches wide (8 centimeters), and found that the larger pieces released water through evaporation at rates as efficient as the smaller ones.

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