Harvesting Water from Air: Using Anhydrous Salt with Sunlight

Renyuan Li, Yusuf Shi, Le Shi, Mossab Alsaedi, Peng Wang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

162 Scopus citations


Atmospheric water is an abundant alternative water resource, equivalent to 6 times the water in all rivers on Earth. This work screens 14 common anhydrous and hydrated salt couples in terms of their physical and chemical stability, water vapor harvesting, and release capacity under relevant application scenarios. Among the salts screened, copper chloride (CuCl2), copper sulfate (CuSO4), and magnesium sulfate (MgSO4) distinguish themselves and are further made into bilayer water collection devices, with the top layer being the photothermal layer, while the bottom layer acts as a salt-loaded fibrous membrane. The water collection devices are capable of capturing water vapor out of the air with low relative humidity (down to 15%) and releasing water under regular and even weakened sunlight (i.e., 0.7 kW/m2). The work shines light on the potential use of anhydrous salt toward producing drinking water in water scarce regions.

Original languageEnglish (US)
Pages (from-to)5398-5406
Number of pages9
JournalEnvironmental Science and Technology
Issue number9
StatePublished - May 1 2018

Bibliographical note

Publisher Copyright:
© 2018 American Chemical Society.

ASJC Scopus subject areas

  • General Chemistry
  • Environmental Chemistry


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