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Zou Y, Yan L, Maillet B, Sidi-Boulenouar R, Brochard L, Coussot P. Critical Role of Boundary Conditions in Sorption Kinetics Measurements. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:18866-18879. [PMID: 38088832 DOI: 10.1021/acs.langmuir.3c02729] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2023]
Abstract
In order to characterize the hygroscopic properties of cellulose-based materials, which can absorb large amounts of water from vapor in ambient air, or the adsorption capacity of pollutants or molecules in various porous materials, it is common to rely on sorption-desorption dynamic tests. This consists of observing the mass variation over time when the sample is placed in contact with a fluid containing the elements to be absorbed or adsorbed. Here, we focus on the case of a hygroscopic material in contact with air at a relative humidity (RH) differing from that at which it has been prepared. We show that the vapor mass flux going out of the sample follows from the solution of a vapor convection-diffusion problem along the surface and is proportional to the difference between the RH of the air flux and that along the surface with a multiplicative factor (δ) depending only on the characteristics of the air flux and the geometry of the system, including the surface roughness. This factor may be determined from independent measurements in which the RH along the surface is known while keeping all other variables constant. Then we show that the apparent sorption or desorption kinetics critically depend on the competition between boundary conditions and transport through the material. For sufficiently low air flux intensities or small sample thicknesses, the moisture distribution in the sample remains uniform and evolves toward the equilibrium with a kinetics depending on the value of δ and the material thickness. For sufficiently high air flux intensities or large sample thicknesses, the moisture distribution is highly inhomogeneous, and the kinetics reflect the ability of water transport by diffusion through the material. We illustrate and validate this theoretical description on the basis of magnetic resonance imaging experiments on drying cellulose fiber stacks.
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Affiliation(s)
- Yuliang Zou
- Laboratoire Navier (Ecole des Ponts Paris Tech-Univ Gustave Eiffel-CNRS), Champs-sur-Marne 77420, France
| | - Luoyi Yan
- Laboratoire Navier (Ecole des Ponts Paris Tech-Univ Gustave Eiffel-CNRS), Champs-sur-Marne 77420, France
| | - Benjamin Maillet
- Laboratoire Navier (Ecole des Ponts Paris Tech-Univ Gustave Eiffel-CNRS), Champs-sur-Marne 77420, France
| | - Rahima Sidi-Boulenouar
- Laboratoire Navier (Ecole des Ponts Paris Tech-Univ Gustave Eiffel-CNRS), Champs-sur-Marne 77420, France
| | - Laurent Brochard
- Laboratoire Navier (Ecole des Ponts Paris Tech-Univ Gustave Eiffel-CNRS), Champs-sur-Marne 77420, France
| | - Philippe Coussot
- Laboratoire Navier (Ecole des Ponts Paris Tech-Univ Gustave Eiffel-CNRS), Champs-sur-Marne 77420, France
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Shan H, Poredoš P, Ye Z, Qu H, Zhang Y, Zhou M, Wang R, Tan SC. All-Day Multicyclic Atmospheric Water Harvesting Enabled by Polyelectrolyte Hydrogel with Hybrid Desorption Mode. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2302038. [PMID: 37199373 DOI: 10.1002/adma.202302038] [Citation(s) in RCA: 18] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Revised: 04/17/2023] [Indexed: 05/19/2023]
Abstract
Sorption-based atmospheric water harvesting (AWH) is a promising approach for mitigating worldwide water scarcity. However, reliable water supply driven by sustainable energy regardless of diurnal variation and weather remains a long-standing challenge. To address this issue, a polyelectrolyte hydrogel sorbent with an optimal hybrid-desorption multicyclic-operation strategy is proposed, achieving all-day AWH and a significant increase in daily water production. The polyelectrolyte hydrogel possesses a large interior osmotic pressure of 659 atm, which refreshes sorption sites by continuously migrating the sorbed water within its interior, and thus enhancing sorption kinetics. The charged polymeric chains coordinate with hygroscopic salt ions, anchoring the salts and preventing agglomeration and leakage, thereby enhancing cyclic stability. The hybrid desorption mode, which couples solar energy and simulated waste heat, introduces a uniform and adjustable sorbent temperature for achieving all-day ultrafast water release. With rapid sorption-desorption kinetics, an optimization model suggests that eight moisture capture-release cycles are capable of achieving high water yield of 2410 mLwater kgsorbent -1 day-1 , up to 3.5 times that of single-cyclic non-hybrid modes. The polyelectrolyte hydrogel sorbent and the coupling with sustainable energy driven desorption mode pave the way for the next-generation AWH systems, significantly bringing freshwater on a multi-kilogram scale closer.
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Affiliation(s)
- He Shan
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore, 117574, Singapore
- Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China
- Engineering Research Center of Solar Power & Refrigeration, MOE China, Shanghai, 200240, China
| | - Primož Poredoš
- Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China
- Engineering Research Center of Solar Power & Refrigeration, MOE China, Shanghai, 200240, China
| | - Zhanyu Ye
- Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China
- Engineering Research Center of Solar Power & Refrigeration, MOE China, Shanghai, 200240, China
| | - Hao Qu
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore, 117574, Singapore
| | - Yaoxin Zhang
- China-UK Low Carbon College, Shanghai Jiao Tong University, 3 Yinlian Road, Shanghai, 201306, China
| | - Mengjuan Zhou
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore, 117574, Singapore
| | - Ruzhu Wang
- Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China
- Engineering Research Center of Solar Power & Refrigeration, MOE China, Shanghai, 200240, China
| | - Swee Ching Tan
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore, 117574, Singapore
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Deng F, Chen Z, Wang C, Xiang C, Poredoš P, Wang R. Hygroscopic Porous Polymer for Sorption-Based Atmospheric Water Harvesting. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2204724. [PMID: 36209387 PMCID: PMC9685462 DOI: 10.1002/advs.202204724] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Revised: 09/16/2022] [Indexed: 06/16/2023]
Abstract
Sorption-based atmospheric water harvesting (SAWH) holds huge potential due to its freshwater capabilities for alleviating water scarcity stress. The two essential parts, sorbent material and system structure, dominate the water sorption-desorption performance and the total water productivity for SAWH system together. Attributed to the superiorities in aspects of sorption-desorption performance, scalability, and compatibility in practical SAWH devices, hygroscopic porous polymers (HPPs) as next-generation sorbents are recently going through a vast surge. However, as HPPs' sorption mechanism, performance, and applied potential lack comprehensive and accurate guidelines, SAWH's subsequent development is restricted. To address the aforementioned problems, this review introduces HPPs' recent development related to mechanism, performance, and application. Furthermore, corresponding optimized strategies for both HPP-based sorbent bed and coupling structural design are proposed. Finally, original research routes are directed to develop next-generation HPP-based SAWH systems. The presented guidelines and insights can influence and inspire the future development of SAWH technology, further achieving SAWH's practical applications.
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Affiliation(s)
- Fangfang Deng
- Institute of Refrigeration and CryogenicsMOE Engineering Research Center of Solar Power and RefrigerationShanghai Jiao Tong UniversityShanghai200040China
| | - Zhihui Chen
- Institute of Refrigeration and CryogenicsMOE Engineering Research Center of Solar Power and RefrigerationShanghai Jiao Tong UniversityShanghai200040China
| | - Chenxi Wang
- Institute of Refrigeration and CryogenicsMOE Engineering Research Center of Solar Power and RefrigerationShanghai Jiao Tong UniversityShanghai200040China
| | - Chengjie Xiang
- Institute of Refrigeration and CryogenicsMOE Engineering Research Center of Solar Power and RefrigerationShanghai Jiao Tong UniversityShanghai200040China
| | - Primož Poredoš
- Institute of Refrigeration and CryogenicsMOE Engineering Research Center of Solar Power and RefrigerationShanghai Jiao Tong UniversityShanghai200040China
| | - Ruzhu Wang
- Institute of Refrigeration and CryogenicsMOE Engineering Research Center of Solar Power and RefrigerationShanghai Jiao Tong UniversityShanghai200040China
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Shan H, Li C, Chen Z, Ying W, Poredoš P, Ye Z, Pan Q, Wang J, Wang R. Exceptional water production yield enabled by batch-processed portable water harvester in semi-arid climate. Nat Commun 2022; 13:5406. [PMID: 36109494 PMCID: PMC9478113 DOI: 10.1038/s41467-022-33062-w] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Accepted: 08/31/2022] [Indexed: 11/09/2022] Open
Abstract
AbstractSorption-based atmospheric water harvesting has the potential to realize water production anytime, anywhere, but reaching a hundred-gram high water yield in semi-arid climates is still challenging, although state-of-the-art sorbents have been used. Here, we report a portable and modularized water harvester with scalable, low-cost, and lightweight LiCl-based hygroscopic composite (Li-SHC) sorbents. Li-SHC achieves water uptake capacity of 1.18, 1.79, and 2.93 g g−1 at 15%, 30%, and 60% RH, respectively. Importantly, considering the large mismatch between water capture and release rates, a rationally designed batch processing mode is proposed to pursue maximum water yield in a single diurnal cycle. Together with the advanced thermal design, the water harvester shows an exceptional water yield of 311.69 g day−1 and 1.09 g gsorbent−1 day−1 in the semi-arid climate with the extremely low RH of ~15%, demonstrating the adaptability and possibility of achieving large-scale and reliable water production in real scenarios.
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