A Janus-type hygroscopic hydrogel for reusable robust dehumidification and efficient solar thermal desorption

Chen, Yingying; Zhou, Wenli; Zhang, Congyuan; Feng, Xiangmin; Deng, Yonghong; Chen, Xinchang; Xie, Heng; Wu, Ting; Qu, Jinping

doi:10.1016/j.cej.2023.142849

Chemical Engineering Journal

2023

DOI: 10.1016/j.cej.2023.142849

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A Janus-type hygroscopic hydrogel for reusable robust dehumidification and efficient solar thermal desorption

Yingying Chen

Wenli Zhou

Congyuan Zhang

et al.

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2024

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Cited by 9 publications

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Extremely Fast Wicking Self‐Layered Interpenetrating Network Hydrogel for Rapid All Day Collection of Atmospheric Water

He,

Zhang,

Xiang

et al. 2024

Adv Funct Materials

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Hygroscopic salt hydrogel photothermal composites and related technology are a promising pathway for water harvesting. However, due to the overly cumbersome preparation process, the distribution of the surface photothermal layer is difficult to control and the photothermal efficiency is low. In this paper, a method is proposed to greatly simplify the preparation process of photothermal layer hydrogels and improve their atmospheric water harvesting performance by constructing temperature‐sensitive interpenetrating networks. Due to the decomposition of some reversible hydrated structures in the network during heating and warming, carbon nanotubes move autonomously to form a layered structure with a photothermal effect on the upper surface, which can return to its original state after cooling and remain stable at room temperature or under solar illumination. Compared with hydrogels with general layered structure or overall distribution of photothermal materials, agar/GG/PAM/CNT hydrogel has faster moisture adsorption efficiency and higher desorption efficiency, and during the 24 h continuous sorption–desorption cycle is capable of achieving high water yield of 2.57 Lwater kgsorbents−1 day−1, superior to most recent hydrogel adsorbents. Simplifying the preparation process while maintaining high efficiency, while greatly improving photothermal performance, paves the way for cost‐effective mass production applications for a wide range of hygroscopic salt‐hydrogel photothermal composites.

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Extremely Fast Wicking Self‐Layered Interpenetrating Network Hydrogel for Rapid All Day Collection of Atmospheric Water

He,

Zhang,

Xiang

et al. 2024

Adv Funct Materials

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Entangled Mesh Hydrogels with Macroporous Topologies via Cryogelation for Rapid Atmospheric Water Harvesting

Sun,

Ni,

et al. 2024

Advanced Materials

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Sorption‐based atmospheric water harvesting (SAWH) is a promising technology to alleviate freshwater scarcity. Recently, hygroscopic salt‐hydrogel composites (HSHCs) have emerged as attractive candidates with their high water uptake, versatile designability, and scale‐up fabrication. However, achieving high‐performance SAWH applications for HSHCs has been challenging because of their sluggish kinetics, attributed to their limited mass transport properties. Herein, a universal network engineering of hydrogels using a cryogelation method is presented, significantly improving the SAWH kinetics of HSHCs. As a result of the entangled mesh confinements formed during cryogelation, a stable macroporous topology is attained and maintained within the obtained entangled‐mesh hydrogels (EMHs), leading to significantly enhanced mass transport properties compared to conventional dense hydrogels (CDHs). With it, corresponding hygroscopic EMHs (HEMHs) simultaneously exhibit faster moisture sorption and solar‐driven water desorption. Consequently, a rapid‐cycling HEMHs‐based harvester delivers a practical freshwater production of 2.85 Lwater kgsorbents−1 day−1 via continuous eight sorption/desorption cycles, outperforming other state‐of‐the‐art hydrogel‐based sorbents. Significantly, the generalizability of this strategy has been validated by extending it to other hydrogels used in HSHCs. Overall, this work offers a new approach to efficiently address long‐standing challenges of sluggish kinetics in current HSHCs, promoting them toward the next‐generation SAWH applications.This article is protected by copyright. All rights reserved

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Solar‐Driven Drum‐Type Atmospheric Water Harvester Based on Bio‐Based Gels with Fast Adsorption/Desorption Kinetics

Zhou,

Yan,

Tang

et al. 2024

Advanced Materials

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Sorption‐based atmospheric water harvesting is an attractive technology for exploiting unconventional water sources. A critical challenge is how to facilitate fast and continuous collection of potable water from air. Here, a bio‐based gel (CAL gel), resulting from the integration of a whole biomass‐derived polymer network with lithium chloride is reported. A fast adsorption/desorption kinetics, with a water capture rate of 1.74 kg kg−1 h−1 at 30% relative humidity and a desorption rate of 1.98 kg kg−1 h−1, was simultaneously realized in one piece of CAL gel, because of its strong hygroscopicity, hydrophilic network, abundant water transport channels, photothermal conversion ability, and ∼200‐μm‐thick self‐supporting bulky structure caused by multicomponent synergy. A solar‐driven, drum‐type, tunable, and portable harvester is designed that can harvest atmospheric water within a brief time. Under outdoor conditions, the harvester with CAL gels operates 36 switches (180°) per day realizes a water yield of 8.96 kg kggel−1 (18.87 g kgdevice−1). This portable harvester highlights the potential for fast and scalable atmospheric water harvesting in extreme environments.This article is protected by copyright. All rights reserved

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A Janus-type hygroscopic hydrogel for reusable robust dehumidification and efficient solar thermal desorption

Cited by 9 publications

References 50 publications

Extremely Fast Wicking Self‐Layered Interpenetrating Network Hydrogel for Rapid All Day Collection of Atmospheric Water

Extremely Fast Wicking Self‐Layered Interpenetrating Network Hydrogel for Rapid All Day Collection of Atmospheric Water

Entangled Mesh Hydrogels with Macroporous Topologies via Cryogelation for Rapid Atmospheric Water Harvesting

Solar‐Driven Drum‐Type Atmospheric Water Harvester Based on Bio‐Based Gels with Fast Adsorption/Desorption Kinetics

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