Material based hydrogel does not work with & # 39; efficiently captures moisture even by air & # 39; low humidity and then jerħiha on request.
a simple device that can & # 39; catch its weight in water from the fresh air and then release that water when heated by the sun can & # 39; provide a secure source of new & # 39; drinking water at & # 39; remote arid regions, suggests new research from KAUST.
Overall, the world air contains approximately 13 trillion tons & # 39; water, renewable vast collection of & # 39; clean drinking water. Trials & # 39; many materials and devices developed to exploit this source of & # 39; water showed that each of them is either too inefficient, expensive or complex for practical use. Model & # 39; prototype developed by the Center of Wang Peng & # 39; Dewalizzazzjoni and Elimination of New & # 39; Water and his team can & # 39; finally change that.
At the heart of the device is cheap salt, stable, non-toxic, calcium chloride. This deliquescent salt is so high affinity for water that will absorb much vapor from the surrounding air to eventually assemble a collection of & # 39; liquid forms, says Renyuan Li, Ph.D. student in team & # 39; Wang. "The deliquescent salt can & # 39; jiddolvi itself by absorbing moisture from the air", he says.
The calcium chloride has great potential for cutting & # 39; water, but apparent from solid liquid as salt after absorbing the water was a major obstacle to its use as a device that captures salt-water, says Li. "Systems using liquid sorbent are very complicated", he says. To overcome the problem, researchers incorporated the salt in & # 39; called hydrogel polymer, which can & # 39; have a large volume & # 39; water while remaining & # 39; solid. They also increased a small amount of & # 39; carbon nanotubes, 0.42 percent by weight, to ensure that the vapor trapped water can & # 39; is released. The carbon nanotubes absorb b & # 39; efficiently the sunlight and convert the energy trapped in the heat.
The team incorporated 35 grams of & # 39; this material in & # 39; simple prototype device. In addition off the night, picked up 37 grams of & # 39; night water when the relative humidity was & # 39; about 60 per cent. The next day, after 2.5 hours of & # 39; & # 39 natural irradiation; sunlight, the majority of & # 39; the sorbed water was released and collected inside the device.
"The most remarkable aspects of the hydrogel are its high performance and low cost," says Li. If the prototype was grown to produce 3 liters of & # 39; water a day – the minimum requirement of water for an adult – the cost of hydrogel Adsorbent materials is as low as half a cent a day.
The next step will be to improve the absorbent hydrogel to release water continuously harvested more than in & # 39; lots, says Wang.