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Atmospheric water harvesting (AWH) has been an appealing prospect for decades to overcome water scarcity in remote areas. Adsorption-based AWH technologies have gained popularity due to their adaptability, and applicability using low-grade heat sources. This study presents up-to-date and future possibilities of adsorbents and systems for adsorption-based AWH. In this review, in-depth advancements in adsorbent materials are compartmentalized into adsorption equilibrium/isotherms, adsorption kinetics, and thermal conductivity. Various systems designs and modifications have been reviewed and classified accordingly. Liquid desiccants i.e., CaCl2 and LiCl-based AWH systems produced in between 0.63 to 1.0 kg/m/d of water. Recently, metal-organic frameworks (MOFs) are realized as effective adsorbents for AWH. Their excellent hydrophilicity, structural integrity, and tailorable structures can provide water in high and low relative humidity (RH) areas. MOF-841 and MOF-801 yielded maximum adsorption uptakes at 25 °C i.e., 0.5 and 0.3 g/g, respectively. MOF-801 showed an excellent water production of 0.2-0.3 L/kg/d at 5%-40% RH and 20-40°C. MOF-303 delivered ~0.7 L/kg/d at 10% RH and 27oC. Cr-soc-MOF-1 and MIL-101(Cr) resulted in maximum adsorption uptakes i.e., 1.9 g/g and 1.4 g/g, respectively. Future possibilities regarding these captivating and emerging adsorption technologies are discussed as concluding remarks.

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This is the author accepted manuscript of the final publication:

Bilal, M., M. Sultan, T. Morosuk, W. Den, U. Sajjad, M.M.A. Aslam (2022). Adsorption Based Atmospheric Water Harvesting: Materials and Systems. International Communications on Heat & Mass Transfer 133, article 105961.

Available for download on Monday, April 01, 2024